Juanita Beach Park is a 22-acre waterfront park run by the City of Kirkland Parks and Community Services Department on Juanita Bay, a shallow arm of Lake Washington's northeast shore in Kirkland's Juanita neighborhood. The site was a private resort from the 1920s until King County bought it in 1956, and the city took it over in 2002. Today it is the busiest waterfront park in Kirkland, with roughly 1,000 feet of sandy shoreline on the south side of NE Juanita Drive and ball fields, tennis courts and an off-leash dog area on the north side.

The address is 9703 NE Juanita Dr, Kirkland. Two free lots hold about 200 cars, and the two halves of the park are linked by crosswalks across Juanita Drive. The park is open from sunrise to 10 pm. There is no entry fee and no parking fee. On summer Friday afternoons the Juanita Friday Market takes over part of the parking lot, so spaces fill early on those days.

The swim area sits inside a U-shaped dock that encloses a protected patch of the bay, with entry from the sand or from the dock itself. When the 1916 Ship Canal dropped the lake about nine feet it exposed a long, gently sloping sand shelf, so the water stays shallow a long way out and suits small children. Lake Washington usually warms into the upper 60s or low 70s by late July and stays cold before then. Lifeguards work daily from noon to 6 pm from early July to early September. Guards do not report when the weather is bad or the air is under 65 degrees. Kids 12 and under must pass an open water swim test before going past the shallow buoy line, nobody may swim past the red and white buoys, and diving is not allowed anywhere at Juanita. Outside guarded hours and seasons you swim at your own risk.

Water quality is the main problem here. The enclosed cove gets little circulation, and ducks and geese gather on the lawn, so fecal bacteria counts spike in warm weather. King County samples the beach weekly from mid-May to late September, and the city has closed the swim area for elevated bacteria in many recent summers. During a closure the city posts signs and pulls the lifeguards. Check the King County beach monitoring results or the city's news page before you go, and skip the water for a few days after heavy rain.

Away from the water there is a playground, sand volleyball courts, picnic shelters, a bathhouse with restrooms, changing rooms and outdoor showers, and a boardwalk trail through the restored Juanita Creek marsh at the west end. The dock is open for fishing, and kayaks and paddleboards can be hand-launched from the beach. The 1905 Forbes House, the original homestead, still stands on the north side. Juanita Bay Park, a wetland preserve with bird-watching boardwalks, is on the opposite side of the bay, about a mile away by road.