Skip to content

Lake Chabot Trail Challenge

When: June 6, 2021
Where: Castro Valley, CA
Race type(s): 13.1M, 5K

RACE INFO: Join us for the 37th annual Lake Chabot Trail Challenge Half Marathon and 5K. The race begins at 8am for the Half Marathon and 8:30am for the 5K. Please arrive early so that you may find parking, pick up your bibs, use restrooms facilities, and be properly prepared to race before the start. Race takes place rain or shine and there are no refunds.

RACE COURSE: The half marathon course is a scenic, hilly loop, mainly on dirt fire roads. The ridge-line views look down upon scenic Lake Chabot, surrounding grassy slopes, and eucalyptus groves. Mt. Diablo and San Francisco Bay are visible along the route. There are water stations with first aid and radio support; we recommend bringing your own hydration as well. The half marathon has a time limit of 3.5 hours. The 5k (3.1 miles) course is an out and back that has gentle rolling hills and consists mostly of paved surfaces. This route includes one water station with first aid and radio support.

RACE FEE: Pre-registered runners will be guaranteed a t-shirt if registered by May 7, 2021. Early bird price for the 5K is $35; Half Marathon $50. After May 7th, registration fee for the 5K is $40 and Half Marathon is $55. Race day registration fee for the 5K is $45 and Half Marathon is $65. If you register on race day, we can only accept cash or check.

BIB NUMBER PICK-UP: Bibs can be picked on race day and it will open at 7am. Both races are chip-timed.

T-SHIRT: Entry fee includes short sleeve, high quality t-shirts for registrations by May 7th so sign-up early. There are no guarantee of t-shirts for runners registered after that date and on race day. We ask for those who did not get a shirt to check in after the race.

AWARDS: Finisher's medals to those who complete their race. Age division medals given to the top 3 in each of 10 age divisions in the half marathon and 12 age divisions in the 5K.

REFRESHMENTS & PRIZES: We will have drinks and snacks after the race, plus great raffle prizes (must be present to win).

QUESTIONS: If you have any questions, please contact Rachel Lunt at

DIRECTIONS: The entrance closest to the event's parking lot is: 17404 Lake Chabot Road, Castro Valley, CA 94546. On Google Maps, this will appear as "Entry of Lake Chabot Parking Space." The registration area and start lines are just a few minutes walk from the lot ( just follow the signs).