FOPOS Weekday Land Stewardship Volunteer Session // 7.30.25
Jul
30
9:00 PM21:00

FOPOS Weekday Land Stewardship Volunteer Session // 7.30.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, July 30th from 9 AM - 11 AM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Would you be interested in registering for multiple volunteer sessions this season? Register HERE.

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FOPOS Trail Crew Volunteer Session // 7.31.25
Jul
31
9:00 PM21:00

FOPOS Trail Crew Volunteer Session // 7.31.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a trail crew volunteer session on Thursday, July 31st, from 9 AM - 11 AM.

Volunteers will work under the guidance of the FOPOS stewardship staff to help monitor and maintain the trails at the Billy Johnson Mountain Lakes Nature Preserve. Volunteers will assist with trail maintenance tasks, such as clearing overgrown vegetation, monitoring for fallen trees, and picking up litter. No prior experience is necessary... just a willingness to get your hands dirty and make a positive impact!

Sign up for this session via Eventbrite.

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FOPOS BioBlitz // 8.2.25
Aug
2
11:00 AM11:00

FOPOS BioBlitz // 8.2.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join Friends of Princeton Open Space for a BioBlitz on Friday, August 2nd from 11 AM - 1 PM at the Billy Johnson Mountain Lakes Nature Preserve!

A BioBlitz is a community science event where volunteers work together to find and identify as many species as possible in a specific area over a short time. Participants will learn about some of the apps they can use to identify plants and animals (iNaturalist and Merlin Bird Id). Then we'll split into teams to explore different parts of the Preserve. Observations will be added to a dedicated iNaturalist project or recorded manually to help build an inventory of the living species that our stewardship team will use in the future to inform restoration efforts.

This community-powered biological inventory helps build a snapshot of local biodiversity -- plants, animals, fungi, and more. Unlike traditional scientific surveys, a BioBlitz brings together people of all backgrounds to learn, observe, and contribute directly to ecological monitoring. The data collected supports habitat restoration and conservation efforts while helping participants build knowledge and a deeper connection to nature right in their own backyard.

Sign up for this session via Eventbrite.

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FOPOS Land Stewardship Volunteer Session // 8.2.25
Aug
2
8:00 PM20:00

FOPOS Land Stewardship Volunteer Session // 8.2.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a volunteer land stewardship session on Saturday, August 2nd, from 8 a.m. - 10 a.m.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Would you be interested in registering for multiple volunteer sessions this season? Register HERE.

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FOPOS Scavenger Hunt: Wonders of Mountain Lakes Nature Preserve // 8.6.25
Aug
6
10:00 AM10:00

FOPOS Scavenger Hunt: Wonders of Mountain Lakes Nature Preserve // 8.6.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join Friends of Princeton Open Space for a fun and interactive scavenger hunt through the Billy Johnson Mountain Lakes Nature Preserve, Princeton’s “Central Park.” Led by FOPOS's summer interns, this guided adventure will take participants through some of the Preserve’s most fascinating natural and restored habitats. From the mysterious Devil’s Cave nestled in a boulder field to the thriving pollinator garden, you’ll discover the ecological diversity and hidden beauty that make this area so special.

Whether you're a longtime visitor or new to the Preserve, this scavenger hunt offers a fresh way to engage with the land, learn about local ecology, and have fun outdoors. All ages are welcome!

Sign up for this session via Eventbrite.

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FOPOS Land Stewardship Volunteer Session // 8.9.25
Aug
9
1:00 PM13:00

FOPOS Land Stewardship Volunteer Session // 8.9.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a volunteer land stewardship session on Saturday, August 9th, from 1 p.m. - 3 p.m.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Would you be interested in registering for multiple volunteer sessions this season? Register HERE.

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FOPOS Land Stewardship Volunteer Session // 8.13.25
Aug
13
9:00 AM09:00

FOPOS Land Stewardship Volunteer Session // 8.13.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, August 13th, from 9 a.m. - 11 a.m.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Would you be interested in registering for multiple volunteer sessions this season? Register HERE.

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FOPOS Trail Crew Volunteer Session // 8.14.25
Aug
14
9:00 PM21:00

FOPOS Trail Crew Volunteer Session // 8.14.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a trail crew volunteer session on Thursday, August 14th, from 9 a.m. - 11 a.m.

Volunteers will work under the guidance of the FOPOS stewardship staff to help monitor and maintain the trails at the Billy Johnson Mountain Lakes Nature Preserve. Volunteers will assist with trail maintenance tasks, such as clearing overgrown vegetation, monitoring for fallen trees, and picking up litter. No prior experience is necessary... just a willingness to get your hands dirty and make a positive impact!

Sign up for this session via Eventbrite.

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FOPOS Land Stewardship Volunteer Session // 8.16.25
Aug
16
9:00 AM09:00

FOPOS Land Stewardship Volunteer Session // 8.16.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a volunteer land stewardship session on Saturday, August 16th. There will be two volunteer sessions; the morning session is from 9 a.m. - 11 a.m and the afternoon session is from 1 p.m. to 3 p.m. Come to one or both. Bring a friend!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Would you be interested in registering for multiple volunteer sessions this season? Register HERE.

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FOPOS Land Stewardship Volunteer Session // 8.20.25
Aug
20
1:00 PM13:00

FOPOS Land Stewardship Volunteer Session // 8.20.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, August 20th, from 1 p.m. - 3 p.m.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Would you be interested in registering for multiple volunteer sessions this season? Register HERE.

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FOPOS August Nature Walk // 8.22.25
Aug
22
1:00 PM13:00

FOPOS August Nature Walk // 8.22.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join us for an adventurous hike along the White Trail at the Billy Johnson Mountain Lakes Nature Preserve! We'll begin at the Mountain Lakes House, then make our way into John Witherspoon Woods, the oldest forest in the Preserve. This walk features rocky, uneven terrain and is best suited for those seeking a moderate challenge.

Along the way, we'll pass through a stunning grove of beech trees, follow along the winding rocky tributary of Mountain Brook, and venture into the boulder fields of the Princeton Ridge, where we’ll visit Devil’s Cave. This is more than just a walk; it's an immersive journey through the wild beauty of what many call Princeton’s “Central Park.”

Come prepared for adventure, wear sturdy shoes, and experience Princeton's natural and rugged beauty.

Sign up for this session via Eventbrite.

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FOPOS Land Stewardship Volunteer Session // 8.27.25
Aug
27
1:00 PM13:00

FOPOS Land Stewardship Volunteer Session // 8.27.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, August 27th, from 9 a.m. - 11 a.m.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

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FOPOS Nature Journaling Meet Up // 7.27.25
Jul
27
10:30 AM10:30

FOPOS Nature Journaling Meet Up // 7.27.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join FOPOS and Eleni Litt for a Nature Journaling meetup. We’ll meet at Mountain Lakes House to draw from Nature in a playful and non-judgemental setting.

This Meet Up is FREE, although registration is required. The program is designed for adults and older teens. Younger participants (under 16) are welcome to join if accompanied by an adult.

This meetup is for artists and non-artists alike, and prior drawing or painting experience is neither required or necessary!

Eleni Zatz Litt (EZL Studio) is a teaching artist, anthropologist, and lifelong learner, with a keen interest in the intersection between art and science. Eleni teaches at the West Windsor Arts Center and the Princeton Adult School; she is a frequent presenter and participant in John Muir Laws’ Nature Journaling Educators Forum.

Sign up for our Nature Journaling Meet Up on Eventbrite

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FOPOS Land Stewardship Volunteer Session // 7.26.25
Jul
26
9:00 AM09:00

FOPOS Land Stewardship Volunteer Session // 7.26.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a volunteer land stewardship session on Saturday, July 26th. There will be two sessions. The morning session will be held from 9 AM to 11 AM, and the afternoon session will be from 1 PM to 3 PM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Looking to register for multiple volunteer sessions this season? Register HERE.

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FOPOS Book Club: Animal, Vegetable, Miracle // 7.25.25
Jul
25
1:00 PM13:00

FOPOS Book Club: Animal, Vegetable, Miracle // 7.25.25

Join Friends of Princeton Open Space (FOPOS) at the Mountain Lakes House for a book club dedicated to readings about conservation, stewardship, and our relationship with nature.

Led by Diana Newby, FOPOS volunteer and faculty member in Princeton University's Writing Program, we'll spend our time together discussing Barbara Kingsolver's novel Animal, Vegetable, Miracle.

Sign up for our FOPOS Book Club on Eventbrite

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FOPOS Weekday Land Stewardship Volunteer Session // 7.23.25
Jul
23
1:00 PM13:00

FOPOS Weekday Land Stewardship Volunteer Session // 7.23.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, July 23rd from 1 PM - 3 PM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Would you be interested in registering for multiple volunteer sessions this season? Register HERE.

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FOPOS Evening Moth Survey // 7.21.25
Jul
21
8:30 PM20:30

FOPOS Evening Moth Survey // 7.21.25

Join FOPOS's stewardship team for an evening moth survey at the Billy Johnson Mountain Lakes Nature Preserve. Moths are fascinating creatures and contribute vital ecosystem services as pollinators and as prey, especially so for baby birds, which primarily rely on caterpillars and other insects for food.

During this session, participants will observe, identify, and learn more about these mysterious night creatures. The program will begin with an educational presentation about moths, led by Patrick Natale, Assistant Professor of Biology at Mercer County Community College, followed by a hands-on activity where participants will log biodiversity data at the Preserve.

Sign up for this session via Eventbrite.

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FOPOS Foraging as Stewardship: Wineberries // 7.20.25
Jul
20
10:00 AM10:00

FOPOS Foraging as Stewardship: Wineberries // 7.20.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Wineberries are one of New Jersey's most abundant summer brambleberries, but they are also very invasive and outcompete native plants. Fortunately, they are delicious and YOU can help us curb their spread by eating them!

Join local experts Matt and Shannon for a wineberry forage walk at the Billy Johnson Mountain Lakes Nature Preserve in Princeton. During this volunteer stewardship session, participants will learn about the origins of wineberry and how to identify this invasive plant--and then we will get picking! Folks will get the chance to take their wineberry harvest home. A recipe card will be included so that you can make wineberry jam at home!

Sign up for this session via Eventbrite.

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FOPOS Tree Identification Nature Walk // 7.19.25
Jul
19
10:00 AM10:00

FOPOS Tree Identification Nature Walk // 7.19.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join our summer interns on a guided Tree Identification Nature Walk as we explore the beautiful Green Trail at the Billy Johnson Mountain Lakes Nature Preserve. Come connect with the forest. Learn simple identification tricks, fun facts, and the ecological roles these trees play in our local ecosystem.

Whether you're a budding naturalist or just curious about the woods you wander through, this event is a great way to deepen your relationship with nature.

Sign up for this session via Eventbrite.

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FOPOS Weekday Land Stewardship Volunteer Session // 7.16.25
Jul
16
1:00 PM13:00

FOPOS Weekday Land Stewardship Volunteer Session // 7.16.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, July 16th from 1 PM - 3 PM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Would you be interested in registering for multiple volunteer sessions this season? Register HERE.

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FOPOS Tree Identification Nature Walk // 7.16.25
Jul
16
10:00 AM10:00

FOPOS Tree Identification Nature Walk // 7.16.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join our summer interns on a guided Tree Identification Nature Walk as we explore the beautiful Green Trail at the Billy Johnson Mountain Lakes Nature Preserve. Come connect with the forest. Learn simple identification tricks, fun facts, and the ecological roles these trees play in our local ecosystem.

Whether you're a budding naturalist or just curious about the woods you wander through, this event is a great way to deepen your relationship with nature.

Sign up for this session via Eventbrite.

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FOPOS Land Stewardship Volunteer Session // 7.12.25
Jul
12
1:00 PM13:00

FOPOS Land Stewardship Volunteer Session // 7.12.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a volunteer land stewardship session on Saturday, July 12th from 1 PM - 3 PM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Looking to register for multiple volunteer sessions this summer? Register HERE.

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Nature Photography with Your Phone // 7.12.25
Jul
12
11:00 AM11:00

Nature Photography with Your Phone // 7.12.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Led by Kirstin Ohrt, creator of Footpathing.com, community members of all ages are welcome to join us at Mountain Lakes House to learn how to view the world around you with a photographer's eye in order to capture the beauty of nature. Attendees will learn to consider shape, proportion, angles and depth to create compelling compositions.

Presented in partnership: Princeton Public Library & Friends of Princeton Open Space. 

Register HERE through the Princeton Public Library

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FOPOS Foraging as Stewardship: Wineberries // 7.12.25
Jul
12
10:00 AM10:00

FOPOS Foraging as Stewardship: Wineberries // 7.12.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Wineberries are one of New Jersey's most abundant summer brambleberries, but they are also very invasive and outcompete native plants. Fortunately, they are delicious and YOU can help us curb their spread by eating them!

Join local experts Matt and Shannon for a wineberry forage walk at the Billy Johnson Mountain Lakes Nature Preserve in Princeton. During this volunteer stewardship session, participants will learn about the origins of wineberry and how to identify this invasive plant--and then we will get picking! Folks will get the chance to take their wineberry harvest home. A recipe card will be included so that you can make wineberry jam at home!

Sign up for this session via Eventbrite.

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FOPOS Weekday Land Stewardship Volunteer Session // 7.9.25
Jul
9
1:00 PM13:00

FOPOS Weekday Land Stewardship Volunteer Session // 7.9.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, July 9th from 1 PM - 3 PM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Looking to register for multiple volunteer sessions this season? Register HERE.

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FOPOS June Nature Walk  // 6.28.25
Jun
28
10:00 AM10:00

FOPOS June Nature Walk // 6.28.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join our summer stewardship interns on a guided nature walk as we celebrate National Pollinator Month! As we wander the trails, we’ll uncover the hidden world of native pollinators, from buzzing bees and fluttering butterflies to surprising pollinators you might not expect.

Sign up for our June Nature Walk on Eventbrite

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FOPOS Weekday Land Stewardship Volunteer Session // 6.25.25
Jun
25
1:00 PM13:00

FOPOS Weekday Land Stewardship Volunteer Session // 6.25.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, June 25th from 1 PM - 3 PM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Looking to register for multiple volunteer sessions this season? Register HERE.

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FOPOS Drop In Nature Craft: Pollinators // 6.24.25
Jun
24
1:30 PM13:30

FOPOS Drop In Nature Craft: Pollinators // 6.24.25

Join Friends of Princeton Open Space (FOPOS) for a pollinator craft at the Billy Johnson Mountain Lakes Nature Preserve. This hands-on activity will take place on the beautiful patio at the Mountain Lakes House, and it is open to all ages and abilities.

Stop by any time between 1:30pm - 3pm for a fun, drop-in craft event all about pollinators! Make a nature-inspired craft and discover the amazing bees, butterflies, and other pollinators that visit the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for our Drop In Nature Craft

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FOPOS Nature Poetry at Mountain Lakes Preserve // 6.22.25
Jun
22
1:00 PM13:00

FOPOS Nature Poetry at Mountain Lakes Preserve // 6.22.25

Take a stroll around the lake with local poets Winifred Hughes Spar and Barbara H. Williams, who will stop at scenic spots to read their poems inspired by the natural world. We’ll explore scenic trails and pause to read and reflect on poetry. Let the beauty of the landscape and the rhythm of words deepen your connection to nature.

Space is limited to 20 participants; be sure to sign up in advance. Please note that this event is geared towards adults.

FREE; Registration Required through Eventbrite

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FOPOS Land Stewardship Volunteer Session // 6.21.25
Jun
21
9:00 AM09:00

FOPOS Land Stewardship Volunteer Session // 6.21.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a volunteer stewardship session on Saturday, June 21st, 2025.

There will be two volunteer sessions, 9 AM - 11 AM or 12 PM - 2 PM. Come to one or both!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this volunteer event on Eventbrite.

Looking to register for multiple volunteer sessions this season? Register HERE.

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FOPOS Weekday Land Stewardship Volunteer Session // 6.18.25
Jun
18
9:00 AM09:00

FOPOS Weekday Land Stewardship Volunteer Session // 6.18.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, June 18th from 9 AM - 11 AM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Looking to register for multiple volunteer sessions this season? Register HERE.

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FOPOS Guided Nature Walk & Plant Pressing // 6.14.25
Jun
14
10:00 AM10:00

FOPOS Guided Nature Walk & Plant Pressing // 6.14.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join our summer stewardship interns on a guided nature walk, where science and art converge amidst gorgeous landscapes of the Billy Johnson Mountain Lakes Nature Preserve. We'll collect plant leaves and delicate summer blooms along our walk. Then, we'll head inside the Mountain Lakes House and practice the craft of plant pressing to preserve our botanical specimen. Celebrate biodiversity as you immerse yourself in the beauty of nature and the preserve's enchanting trails.

Sign up for our Guided Nature Walk & Plant Pressing on Eventbrite

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FOPOS Weekday Land Stewardship Volunteer Session // 6.11.25
Jun
11
1:00 PM13:00

FOPOS Weekday Land Stewardship Volunteer Session // 6.11.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, June 4th from 10 AM - 12 PM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Looking to register for multiple volunteer sessions this season? Register HERE.

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Gardening with Native Plants // 6.8.25
Jun
8
1:00 PM13:00

Gardening with Native Plants // 6.8.25

Learn how to select, plant, and care for beautiful (low maintenance) native plants to create a bird- and bee-friendly garden and yard!

The Whole Earth Center and Friends of Princeton Open Space invite you to join us at this outdoor workshop, which includes a presentation by Judith K. Robinson on the design and care of a native plant garden, followed by a short walk to the Louise Sayen Meadow of Native Plants.

Each paid attendee will receive a free native plant seedling + a portion of each ticket price will be donated to Friends of Princeton Open Space

Sign up on Eventbrite

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FOPOS Foraging as Stewardship: Mugwort // 6.8.25
Jun
8
10:00 AM10:00

FOPOS Foraging as Stewardship: Mugwort // 6.8.25

Join the Friends of Princeton Open Space (FOPOS) and local foraging experts for a Mugwort Foraging Event at the Billy Johnson Mountain Lakes Nature Preserve in Princeton.

In this hands-on event, participants will delve into the world of the invasive plant, Mugwort. Under the guidance of our stewardship team and local foraging experts Matt and Shannon, participants will learn how to properly identify mugwort, sample a recipe, and safely remove it from designated restoration areas at the preserve. From teas to donuts to savory dishes, discover how mugwort can enhance your kitchen creations.

Sign up for this session via Eventbrite.

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Spring Bird Walk with Winnie Hughes Spar // 6.7.25
Jun
7
8:00 AM08:00

Spring Bird Walk with Winnie Hughes Spar // 6.7.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) and expert birder Winnie Hughes Spar for a guided bird walk through the Billy Johnson Mountain Lakes Nature Preserve in Princeton, NJ. Together, we will observe Princeton's birds and learn about their fascinating habits!

Space is limited to 20 participants; be sure to sign up in advance. Please note that this event is geared towards adults. This event is weather permitting.

Sign up online.

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Weekday Land Stewardship Volunteer Session // 6.4.25
Jun
4
10:00 AM10:00

Weekday Land Stewardship Volunteer Session // 6.4.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, June 4th from 10 AM - 12 PM.

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration work and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up for this session via Eventbrite.

Looking to register for multiple volunteer sessions this season? Register HERE.

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May Nature Walk // 5.31.25
May
31
10:00 AM10:00

May Nature Walk // 5.31.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join us for our May Nature Walk through the trails of the Billy Johnson Mountain Lakes Nature Preserve.

Led by the Friends of Princeton Open Space stewardship team, this guided walk will offer a chance to explore lush trails, vibrant spring blooms, and the sights and sounds of nature as the season comes alive. Whether you’re a seasoned hiker or a first-time visitor, it's the perfect way to enjoy the outdoors and reconnect with nature. Our stewardship team will also share insights into the history of the preserve and the ongoing land stewardship efforts that help protect this special place for future generations.

Be sure to wear sturdy, weather-appropriate footwear. Feel free to bring a camera or binoculars along to help you spot and capture the beauty of wildlife as we explore.

Sign up for our May Nature Walk on Eventbrite

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FOPOS Book Club: Prodigal Summer // 5.30.25
May
30
1:00 PM13:00

FOPOS Book Club: Prodigal Summer // 5.30.25

Join Friends of Princeton Open Space (FOPOS) at the Mountain Lakes House for a book club dedicated to readings about conservation, stewardship, and our relationship with nature.

Led by Diana Newby, FOPOS volunteer and faculty member in Princeton University's Writing Program, we'll spend our time together discussing Barbara Kingsolver's novel Prodigal Summer.

Sign up for our FOPOS Book Club on Eventbrite

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Weekday Land Stewardship Volunteer Session // 5.28.25
May
28
1:00 PM13:00

Weekday Land Stewardship Volunteer Session // 5.28.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer stewardship session on Wednesday, May 28th 1 PM - 3 PM!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Spring is here! Volunteers will head out to one of our forest or riparian restoration sites for critical tasks such as invasive species removal, spring planting, or installing cages around native plants to protect them from deer & beaver browse. If you’re looking for a fun way to spend time outdoors and make a real difference, this is the perfect chance to get involved and help protect our local ecosystem.

Sign up online.

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Land Stewardship Volunteer Session // 5.24.25
May
24
10:00 AM10:00

Land Stewardship Volunteer Session // 5.24.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a volunteer stewardship session on Saturday, May 24th, 2025. There will be two sessions, 10AM - 12PM or 1 PM - 3 PM. Come to one or both!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecosystem restoration and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely efforts and maintaining our natural lands

Sign up online.

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Weekday Land Stewardship Volunteer Session // 5.21.25
May
21
10:00 AM10:00

Weekday Land Stewardship Volunteer Session // 5.21.25

  • Friends Of Princeton Open Space (map)
  • Google Calendar ICS

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer stewardship session on Wednesday, May 21st 10 AM - 12 PM!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform ecological restoration and invasive species removal in the Billy Johnson Mountain Lakes Nature Preserve.

Sign up online.

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