Surprise Lake
Swimming hole in Greenwood Lake (ny), New Jersey · Lake
A guide to hiking to Surprise Lake in NJ. Find directions, trail difficulty, parking info, and safety tips for this secluded lake near Greenwood Lake.
About Surprise Lake
Tucked into the highlands straddling the New Jersey–New York border, Surprise Lake lives up to its name. After pushing through a mile-plus of uphill trail — lungs burning, boots scraping over exposed rock and tangled roots — you crest a rise and there it is: a glittering freshwater lake sitting quietly in the forest, as if it had been waiting for you all along. This is a backcountry reward, earned honestly, and that's exactly what makes it special.
The Setting and Landscape
The 1.2-mile trail to Surprise Lake is rated moderate to strenuous, and it earns that rating. Steep pitches and uneven terrain demand sturdy footwear and a reasonable level of fitness, but the payoff is extraordinary. Along the way, the tree canopy opens at intervals to deliver sweeping panoramic views of Greenwood Lake shimmering in the valley below — the kind of view that stops you mid-stride and makes you forget your burning quads. Wildflowers crowd the trailside in spring, summer deepens the forest into rich greens, and fall sets the surrounding ridge ablaze with amber, crimson, and gold. Wildlife is active throughout the seasons: listen for the rustle of white-tailed deer through the underbrush or the call of a hawk riding thermals overhead. The lake itself sits in a natural basin, wild-edged and undeveloped, ringed by trees that lean toward the water as if admiring their own reflection.
Swimming and the Water Experience
Surprise Lake is an unofficial swimming destination, which means you arrive on nature's terms. There are no roped swim zones, no posted depth markers, and no lifeguards on duty — just clear, cool freshwater fed by the surrounding highlands. The lake feels genuinely refreshing on a summer afternoon, the kind of cold that makes you gasp at first entry and feel completely alive moments later. Underwater visibility tends to be good in a lake of this type and setting, and the natural shoreline offers spots to ease in gradually or launch off a rock if you're bold. Because this spot carries no official sanction and no developed facilities, you'll want to use sound judgment about water conditions and your own swimming ability before going in.
Plan Your Visit
There are absolutely no facilities at Surprise Lake — no restrooms, no picnic tables, no trash cans, no signage. Pack everything in and pack everything out. Bring more water than you think you need, wear layers, and keep a first-aid kit in your pack given the remote nature of the hike. There is no confirmed fee to access the trail, but conditions and access can change, so check local trail resources before heading out. The best windows for a visit run from late spring through early fall, with summer weekday mornings offering the best combination of warm swimming temperatures and relative solitude.
Surprise Lake sits conveniently close to two worthwhile base towns. West Milford, NJ offers practical amenities — gas stations, convenience stores, and local eateries — just a short drive from the trailhead area. Cross the border into Greenwood Lake, NY for lakeside dining, a classic small-town vibe, and stunning views of the lake you glimpsed from the trail ridge. Both towns make excellent starting or ending points for a day built around this hidden highland gem.
The experience
- Best time to visit Late spring through early fall are ideal for visiting Surprise Lake. Spring offers blooming wildflowers along the trail, summer provides perfect swimming conditions, and fall showcases vibrant foliage that enhances the surrounding landscape.
- Access Moderate to strenuous. The uphill hike to Surprise Lake spans 1.2 miles and requires sturdy footwear and a good level of fitness. The trail includes steep sections and uneven terrain.
- Facilities Surprise Lake has no facilities, so visitors should come prepared with water, snacks, and any necessary supplies. The lack of amenities enhances its untouched appeal.
Highlights & features
- Challenging hike with stunning views of Greenwood Lake
- Refreshing freshwater swimming experience
- Rich wildlife and diverse plant life
- No facilities, offering a raw and natural experience
- Perfect for photographers seeking scenic shots
- Remote and untouched natural swimming hole
- Panoramic views of Greenwood Lake en route
- Wildlife-rich surroundings
How to get there
Surprise Lake is located in northern New Jersey, near the border with New York. Below are clear, step-by-step directions to help you reach the parking area and access the trailhead leading to the lake. Driving Directions:
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Start in West Milford, NJ
West Milford is located in northern New Jersey, south of the New York state border. If you're unfamiliar with the area, use GPS to navigate to West Milford as your starting point.
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Head North on Route 513 (Union Valley Road)
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From West Milford, drive north on Route 513 (Union Valley Road) for approximately 2.1 miles .
Turn Left onto County Road 511 North (Lakeside Road) After 2.1 miles, turn left onto County Road 511 North, also known as Lakeside Road. This road runs along the western shore of Greenwood Lake. Continue to the New York State Line Follow County Road 511 North for several miles until you reach the New York state line. Along the way, you will pass scenic views of Greenwood Lake. Look for Greenwood Marina , which will be on the right-hand side of the road (east side). Park Across from Greenwood Marina There is a parking lot directly across the road from Greenwood Marina. Use this lot to park your vehicle. Parking is free, but spaces may be limited during busy times, so plan accordingly.
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Trailhead and Hiking Directions
Locate the State Line Trailhead From the parking lot, look for the State Line Trailhead , marked with a blue-on-white blaze . The trailhead is easy to spot near the parking area. Begin Your Hike The hike to Surprise Lake is approximately 1.2 miles and is considered strenuous , as it involves a steady uphill climb. Be prepared for rocky terrain and bring water and appropriate footwear. Enjoy the Overlook Along the trail, you will pass a stunning overlook with views of Greenwood Lake. This is a great spot to take a break and enjoy the scenery.
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Arrive at Surprise
Lake Continue on the trail until you reach Surprise Lake. The lake is secluded and surrounded by natural beauty, making it an ideal spot for relaxation and exploration.
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Additional Notes
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Parking
The parking lot across from Greenwood Marina is the best option for accessing the trailhead. Arrive early during peak times to secure a spot. Trail Conditions: The trail is steep and rocky in sections, so it is recommended for experienced hikers or those in good physical condition. Preparation: Bring water, snacks, and appropriate hiking gear. Cell service may be limited in some areas, so plan ahead. Enjoy your visit to Surprise Lake!
Plan your visit
There are absolutely no facilities at Surprise Lake — no restrooms, no picnic tables, no trash cans, no signage. Pack everything in and pack everything out. Bring more water than you think you need, wear layers, and keep a first-aid kit in your pack given the remote nature of the hike. There is no confirmed fee to access the trail, but conditions and access can change, so check local trail resources before heading out. The best windows for a visit run from late spring through early fall, with summer weekday mornings offering the best combination of warm swimming temperatures and relative solitude. Surprise Lake sits conveniently close to two worthwhile base towns. West Milford, NJ offers practical amenities — gas stations, convenience stores, and local eateries — just a short drive from the trailhead area. Cross the border into Greenwood Lake, NY for lakeside dining, a classic small-town vibe, and stunning views of the lake you glimpsed from the trail ridge. Both towns make excellent starting or ending points for a day built around this hidden highland gem.
There are absolutely no facilities at Surprise Lake — no restrooms, no picnic tables, no trash cans, no signage. Pack everything in and pack everything out. Bring more water than you think you need, wear layers, and keep a first-aid kit in your pack given the remote nature of the hike. There is no confirmed fee to access the trail, but conditions and access can change, so check local trail resources before heading out. The best windows for a visit run from late spring through early fall, with summer weekday mornings offering the best combination of warm swimming temperatures and relative solitude.
Surprise Lake sits conveniently close to two worthwhile base towns. West Milford, NJ offers practical amenities — gas stations, convenience stores, and local eateries — just a short drive from the trailhead area. Cross the border into Greenwood Lake, NY for lakeside dining, a classic small-town vibe, and stunning views of the lake you glimpsed from the trail ridge. Both towns make excellent starting or ending points for a day built around this hidden highland gem.
Access & fees
Access is via an unofficial, strenuous hiking trail. There is no fee for parking or access, but this is not a managed recreation site. Parking is in a free lot across from Greenwood Marina in New York; spaces are limited. No facilities or sanctioned activities are present at the lake.
Access is via an unofficial, strenuous hiking trail. There is no fee for parking or access, but this is not a managed recreation site. Parking is in a free lot across from Greenwood Marina in New York; spaces are limited. No facilities or sanctioned activities are present at the lake.
Frequently asked questions
Is SURPRISE LAKE free to visit?
SURPRISE LAKE is generally free to access. No entry fee is commonly reported, though parking passes or day-use fees can be introduced — always confirm current rules before heading out.
Is swimming allowed at SURPRISE LAKE?
Yes, SURPRISE LAKE is an officially sanctioned recreation area where swimming is permitted. Reported activities include: Unknown. Always respect posted closures and seasonal restrictions.
What type of swimming spot is SURPRISE LAKE?
SURPRISE LAKE is a lake on Surprise Lake located in NJ, near GREENWOOD LAKE (NY). A guide to hiking to Surprise Lake in NJ. Find directions, trail difficulty, parking info, and safety tips for this secluded lake near Greenwood Lake.
When is the best time to visit SURPRISE LAKE?
The best time to visit SURPRISE LAKE is Late spring through early fall are ideal for visiting Surprise Lake. Spring offers blooming wildflowers along the trail, summer provides perfect swimming conditions, and fall showcases vibrant foliage that enhances the surrounding landscape.. Water levels, clarity, and temperature vary with recent weather — always check conditions before going, especially after rain or snowmelt.
What facilities are available at SURPRISE LAKE?
Reported facilities at SURPRISE LAKE include: Surprise Lake has no facilities, so visitors should come prepared with water, snacks, and any necessary supplies. The lack of amenities enhances its untouched appeal.. Amenities can change — contact the managing agency or check recent visitor reports to confirm current availability.
Regional guide
This spot is featured in our Mullica River & Wharton State Forest swimming roundup with related swimming holes in New Jersey.
Nearby swimming holes
Culture & history
Located near Surprise Lake Camp, the oldest Jewish summer camp in the U.S., the area holds historical significance even though the camp itself is in New York.
Conservation
Visitors are urged to practice Leave No Trace principles to protect the fragile ecosystem. Avoid littering and stay on designated trails to minimize environmental impact.