Join the Friends of Princeton Open Space (FOPOS) for a seed sowing event on Saturday, January 18th from 10AM - 12PM.

Dreaming of spring? Join us at the beautiful Mountain Lakes House for a seed sowing event. Help our stewardship team sow native seeds for the spring 2025 season!

Sign up online.

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer land stewardship session on Wednesday, January 15th from 1PM - 3PM.

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.

Meeting Location: Mountain Lakes House Parking lot, 57 Mountain Ave, Princeton NJ, 08540. Be sure to drive down the long paved driveway entrance to the Billy Johnson Mountain Lakes Nature Preserve, marked by a series of black mail boxes. The gravel parking lot is on your left about a 1/2 mile down the driveway.

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Join the Friends of Princeton Open Space (FOPOS) and South Jersey Wildlife Tours for a guided Woodpecker Walk on Saturday, November 23rd at 9:30am. We will explore the trails of the Billy Johnson Mountain Lakes Nature Preserve in search of the fascinating woodpeckers that call New Jersey home.

Sign up on Eventbrite.

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer stewardship session on Wednesday, December 18th 1PM - 3 PM!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup and planting efforts.

Sign up online.

Join the Friends of Princeton Open Space (FOPOS) for a volunteer stewardship session on Saturday, December 14th, 2024!

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 for the winter months ahead.

We have two volunteer sessions:

Session 1: 10 AM - 12 PM
Session 2: 1 PM - 3 PM

Sign up online.

Stop in any time at our Holiday Open House. Enjoy a warm drink, holiday treats, and our Perspectives on Preservation photography exhibition. Learn more about the Friends of Princeton Open Space and while you're here, take a stroll outside to see our beautifully decorated Christmas tree and gather with community members to celebrate the season.

Free and open to all. We kindly ask for your RSVP.

Stop in any time at our Holiday Open House. Enjoy a warm drink, holiday treats, and our Perspectives on Preservation photography exhibition. Learn more about the Friends of Princeton Open Space and while you're here, take a stroll outside to see our beautifully decorated Christmas tree and gather with community members to celebrate the season.

Free and open to all. We kindly ask for your RSVP.

Join us for our December Nature Walk at the Billy Johnson Mountain Lakes Nature Preserve. Led by Anna Corichi, Friends of Princeton Open Space's Director of Natural Resources and Stewardship, we'll observe the great diversity of life at the Preserve and learn more about the work that is being done by our stewardship and trails teams. After the walk, you are invited to warm up inside at our Holiday Open House!

Sign up for our December Nature Walk on Eventbrite

Please join Friends of Princeton Open Space at the Mountain Lakes House for the opening reception of our annual Perspectives on Preservation Photography Exhibition, featuring selected photographs from our 2024 photo contest, as well as photographs of the Mountain Lakes Open Space Area by Frank Sauer.

Free and open to all. We kindly ask for your RSVP.

Join the Friends of Princeton Open Space (FOPOS) and South Jersey Wildlife Tours for a guided Woodpecker Walk on Saturday, November 23rd at 9:30am. We will explore the trails of the Billy Johnson Mountain Lakes Nature Preserve in search of the fascinating woodpeckers that call New Jersey home.

Sign up on Eventbrite.

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer stewardship session on Wednesday, November 20th 10:00am-12:00pm!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup and planting efforts.

Sign up online.

Join us for a fall nature walk around the lake at the Billy Johnson Mountain Lakes Nature Preserve. Led by Anna Corichi, Friends of Princeton Open Space's Director of Natural Resources and Stewardship, we'll explore the beauty of the fall season and witness the wonders of nature preparing for winter.

Sign up online.

Join the Friends of Princeton Open Space (FOPOS) for a volunteer stewardship session on Saturday, November 9th, 2024 from 10AM - 12PM!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup and planting efforts.

Sign up online.

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer stewardship session on Wednesday, November 6th 1PM - 3 PM!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup and planting efforts.

Sign up online.

Join the Friends of Princeton Open Space (FOPOS) and South Jersey Wildlife Tours for a guided Eastern Screech Owl Walk at dusk on Sunday, October 27th at 7:30pm.

Did you know that Eastern Screech Owls are one of the most common owl species in North America? Odds are you have one of these nocturnal neighbors mere miles (or less!) from your doorstep. During this experience, we will walk the trails at the Billy Johnson Mountain Lakes Nature Preserve in Princeton and listen and look for Eastern Screech Owls, learning much more about them along the way.

Space is limited to 20 participants; be sure to sign up in advance. Please note that this event is geared towards adults as it begins at 7:30 PM.

Cost: Adults are $15 each and kids under 10 are free.

Please note that Screech Owl sightings are not guaranteed. We do have high owl activity at the preserve but you never know how the night will go.

Sign up on Eventbrite.

Join the Friends of Princeton Open Space (FOPOS) for a volunteer stewardship session on Saturday, October 26th, 2024!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup and planting efforts.

We have two volunteer sessions:

Session 1: 10 AM - 12 PM
Session 2: 1 PM - 3 PM

Sign up online.

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer stewardship session on Wednesday, October 23rd 10:00am-12:00pm!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup and planting efforts.

Sign up online.

Come join us on Saturday, October 19th at 1:00 PM for a creative event at Mountain Lakes House. Get ready to unleash your artistic side as we create beautiful pressed plant pumpkins on the patio! This hands-on workshop will allow you to connect with nature and create a unique piece of fall art to take home with you.

Don't miss out on this opportunity to enjoy nature and get crafty with us.

Limited to 15 participants. Suggested donation $10 per person.

Sign up online.

Join Us for a Fall Seed Walk and embrace the spirit of stewardship! This is a fantastic opportunity to connect with nature, learn about native plants, and contribute to our forest and riparian restoration projects.

Venture into the preserve with our stewardship team as we collect seeds from an array of native plants that may include hibiscus, milkweed, flowering dogwood, button bush, oaks, lobelias, and ironweed.

We'll then process and bag the seeds we’ve collected. These seeds will be stored over the winter, ready to be propagated next year and planted in our habitat restoration sites. Plus, we’ll have plenty for you to take home and plant in your own garden!

Sign up online.

Join the Friends of Princeton Open Space (FOPOS) for a volunteer stewardship session on Saturday, October 12th, 2024!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup and planting efforts.

We have two volunteer sessions:

Session 1: 10 AM - 12 PM
Session 2: 1 PM - 3 PM

Sign up online.

Join Us for a Fall Seed Walk and embrace the spirit of stewardship! This is a fantastic opportunity to connect with nature, learn about native plants, and contribute to our forest and riparian restoration projects.

Venture into the preserve with our stewardship team as we collect seeds from an array of native plants that may include hibiscus, milkweed, flowering dogwood, button bush, oaks, lobelias, and ironweed.

We'll then process and bag the seeds we’ve collected. These seeds will be stored over the winter, ready to be propagated next year and planted in our habitat restoration sites. Plus, we’ll have plenty for you to take home and plant in your own garden!

Sign up online.

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

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup and planting efforts.

Sign up online.

Join Friends of Princeton Open Space for our annual Fall Fest fundraiser to honor our community volunteers and raise funds for our paid internship program. The event will take place in the beautiful setting of the Mountain Lakes House, overlooking the lake at the Billy Johnson Mountain Lakes Nature Preserve in Princeton, New Jersey.

Featuring:

• Live Music

• Local craft beer, hard cider, and non-alcoholic drinks

• Plant-based fall food

• Nature-themed activities for all ages

Reserve your tickets HERE.

Join the Friends of Princeton Open Space (FOPOS) for a volunteer stewardship session on Saturday, October 5th, 2024!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup and planting efforts.

We have one volunteer sessions from 10 AM - 12 PM

Sign up online.

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.

Join the Friends of Princeton Open Space (FOPOS) for a volunteer stewardship session on Saturday, September 28th, 2024!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely fall cleanup efforts.

We have two volunteer sessions:

Session 1: 9:00am-11:00pm
Session 2: 12:00pm-2:00pm

Sign up online.

Join the Friends of Princeton Open Space (FOPOS) for a weekday volunteer stewardship session on Wednesday, September 25th 10:00am-12:00pm!

Volunteers will work under the guidance of the FOPOS stewardship staff to perform riparian and forest restoration, invasive species removal, and plant native species in the Billy Johnson Mountain Lakes Nature Preserve. We will focus on timely summer cleanup efforts.

Sign up online.

Join the Friends of Princeton Open Space (FOPOS) and South Jersey Wildlife Tours for a guided Eastern Screech Owl Walk at dusk on Saturday, September 21st at 7:30pm.

Space is limited to 20 participants; be sure to sign up in advance. Please note that this event is geared towards adults as it begins at 7:30 PM.

Cost: Adults are $15 each and kids under 10 are free.

Sign up on Eventbrite.

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.

Runners take your mark!

Join Princeton Athletic Club for the annual Mountain Lakes 5k Run + Walk in the beautiful Billy Johnson Mountain Lakes Nature Preserve benefitting Friends of Princeton Open Space.