Lake Anza is the only freshwater swimming lake easily accessible to Bay Area residents, offering a refreshing escape from summer heat without the crowds of beaches or pools. The spring-fed reservoir sits nestled in Tilden Park’s redwood groves, with a sandy beach, dedicated swim area, and all the comforts of a well-run public facility.

The lake remains a favorite among families, lap swimmers, and anyone seeking a cool dip surrounded by oak and redwood forest. The protected cove creates gentle conditions and warm water by August—a rarity in the Bay Area’s cold Pacific-influenced lakes.

Swimming Season and Hours

Lake Anza operates seasonally, typically opening in May and closing by late September. During peak season (mid-June through August), the beach is open daily from 11am to 6pm. In early June and late September, it operates weekends and holidays only. Water quality is tested weekly from April through October for safety. Check the East Bay Parks website for exact opening dates each year.

Amenities and Fees

The sandy beach is broad and sunny, sheltered from wind by surrounding hills. Lifeguards are on duty during operating hours; swimming is allowed only in the designated swim area marked by floats. A bathhouse with changing rooms and cold-water showers is provided, along with a concession stand selling ice cream, hot dogs, and snacks. Picnic tables and grassy areas allow visitors to bring food and spend the day.

Admission is $5 for adults (18-61), $3 for children and seniors, and free for children under 2. A parking fee may apply depending on current East Bay Parks policy.

Rules and Guidelines

Dogs are not permitted in the swimming area or beach zone. Visitors can bring only lettuce or celery to feed ducks and other waterfowl. Life jackets are recommended for weaker swimmers. The lake does not permit diving or jumping from the dock. Glass containers and alcohol are prohibited.

Practical Information

Arrive early on warm weekends—the parking lot can fill completely by mid-morning. Bring sunscreen, a towel, and water for after swimming. The lake is best enjoyed mid-June through August when water temperatures reach their warmest. Spring and fall visits offer fewer crowds but cooler water.

The surrounding Tilden Park offers hiking trails from easy walks near the lake to more strenuous ridge hikes. Combine a swim with a picnic and explore the redwood groves and meadows that make this park special.