Swim Facility Hours:
Apr 29 to May 28 - Weekends and Holidays Only
May 29 to Aug 18 - Open Daily (Mon–Sun)
Aug 19 to Sep 4 - Weekends and Holidays Only
11am to 6pm (water closes at 5:30pm)
Parking Lot Hours:
Mar to Nov: 8am-10pm
Dec to Feb: 8am-8pm
Park is closed from 10pm-5am unless otherwise posted or permitted.
No Parking Fee
No Dog Fee (No dogs allowed in the swim facility)
Swim Facility Fees
$4.00 age 16-61
$2.00 age 1-15
$2.00 seniors 62+ or disabled
FREE under 1 year
18627 Cull Canyon Rd. Castro Valley, CA 94552
Toll Free: 888-EBPARKS (888-327-2757), option 3, extension 3076
Swim Facility Dates at Cull Canyon
Open Weekends & Holidays Only April 29 - May 28
Open daily May 29 - August 18
Open Weekends & Holidays Only August 19 - September 4
Swim Facility closed for the season after September 4, 2023
Plan in Advance! Pre-register below for Weekends & Holidays
Due to the popularity of swimming at Cull Canyon, the swim facility reaches capacity very early on weekends and Holidays. Once the swim facility capacity is reached, there will be no new entries allowed for the remainder of the day.
This popular Castro Valley swim complex is only a short drive north from Interstate 580 on Cull Canyon Road in Castro Valley.
The lagoon won the 1966 Governor's Design Award for Exceptional Distinction for Recreational Development in the category of landscape.
When the swim area was constructed, a secondary dam was built to provide an inner swimming area complete with a sandy beach. Never previously tried, this innovation made the swim area water level independent of the reservoir's, unaffected by summer draw-downs. The reservoir no longer exists south of the swim area.
Swim Facilities Capacity Notice
Due to the popularity of swimming at Cull Canyon, the swim facility reaches capacity very early on weekends and Holidays. Once the swim facility capacity is reached, there will be no new entries allowed for the remainder of the day (or at the discretion of the Park Supervisor), for the safety of the public. Please take this into consideration when planning your visit.
To Reach The Park
NOTE: No alcohol, glass containers, or portable bbq’s allowed in the swim lagoon area.
There are several reservable picnic areas outside the swim complex. For information, call 1-888-EBPARKS or 1-888-327-2757, press option 2.
It is strongly recommended that visitors make a picnic reservation for Weekends and Holidays. Any group of 30 or more people must make a reservation, any day of the week.
Cull Canyon is also on the Chabot-to-Garin Regional Trail, which is being developed between the two parks. The trail runs along Cull Canyon Rd, starting at Heyer Avenue, and drops down toward Cull Creek, paralleling Alameda County Flood Control property. It continues through Cull Canyon Regional Recreation area then heads north for six miles into East Bay Municipal Utility District property to EBMUD's Chabot Staging Area on Redwood Road (an EBMUD hiking permit is required for this section). From there the Willow View Trail leads into Anthony Chabot Regional Park.