Surprise 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 striking 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.