Park Slope’s Best Outdoor Pools and Rock Pools for Lap Swimming This Summer

With July heat settling in over Brooklyn, local lap swimmers have turned to Park Slope’s outdoor pools and rock pools, searching for refreshment and fitness in equal measure. This summer, access to open-air lap swimming has become a hot topic, as long waits and renovation projects affect several city-run pools, while demand keeps climbing.

Lately, Park Slope residents have been swapping pool recommendations at the corner of 9th Street and 7th Avenue, and local forums are swimming with requests for up-to-date guidance. Two big draws for serious lap swimmers stand out in the neighborhood: the Douglass and DeGraw Pool-simply called Double D by regulars-on Nevins Street, and the not-so-secret Prospect Park Waterfall Pools, where families and early risers alike are lining up for space in the water.

Where to Swim Your Laps in Park Slope

Located at 230 Douglass Street, the Douglass and DeGraw Pool offers a full 75-foot length, making it one of the few lap-friendly outdoor pools close to key Park Slope transit lines. The NYC Parks Department has set up dedicated lap swim hours at Double D, with weekday morning sessions from 7am to 8:30am, and evening slots from 7pm to dusk. Access is free with a NYC Parks pool membership, which can be obtained online or at the gate.

Prospect Park’s Waterfall Pools, found near the southern end of the park off Vanderbilt Street, aren’t lap pools in the formal sense, but savvy swimmers know that the pools’ rock-lined, gently flowing channels serve as a quieter destination for sunrise and sunset laps. The Waterfall Pools are typically open from 7:00am until 7:00pm, and are especially popular with families on weekends, so weekday mornings remain the best bet for undisturbed adult swimming.

Residents at the north end of Park Slope sometimes gravitate toward Thomas Greene Playground’s seasonal pool, just over the border in Gowanus, although its 2026 reopening date remains contingent on repairs and city budget finalization. The Old Stone House community garden occasionally hosts aqua fitness pop-ups, but these are usually for gentle exercise rather than full lap sessions.

Demand Surges as Heat and Repairs Put Pressure on Capacity

City data shows that Brooklyn’s public outdoor pools drew over 1.76 million visits during the 2023 summer season-a 12% jump from 2022, according to NYC Parks weekly attendance reports. This summer, demand is up again, reports the Parks Department, in part due to a spike in heat emergencies and lingering pandemic-era interest in outdoor activities.

While admission to all NYC public pools remains free, swimmers are advised to bring locks for lockers and to arrive early for a shot at a proper lap lane. The Parks Department’s official pool rules (updated June 2026) require proper swimwear and prohibit flotation devices during lap swim hours. For those seeking more flexibility, the nearby St. John’s Recreation Center at 1251 Prospect Place offers paid access to its indoor lap lanes, with day passes starting at $11 for adults-though these fill quickly during heat waves, neighborhood officials confirm.

This July, some Park Slope swimmers have found that pool capacity fills within 20 minutes of opening. NYC Parks continues to stress that all outdoor pools-including Douglass and DeGraw-close for cleaning from 3pm to 4pm daily, so planning a midday workout may require patience or a picnic in nearby JJ Byrne Playground while you wait for readmission.

For those just getting started, the Parks Department relaunches its Lap Swim program on July 8, 2026, offering structured morning workouts at select pools, including Double D. Capacity is capped and registration is required online at nycgovparks.org. As temperatures rise and more Brooklynites look for open water, keeping an eye on pool status and making backup plans can make the difference between a satisfying swim and a frustrating queue. For many, a bit of legwork pays off: nothing beats an early morning in cool water with towering sycamores overhead and the city just waking up nearby.