Lake Chabot Trail Challenge (Half Marathon & 5K)
Sunday, June 6, 2027, first start 8:00 AM, in Castro Valley (17404 Lake Chabot Road). Distances: 5K, Half marathon. Entry from $40 to $65; the Half marathon goes from $65 to $70 after June 6.
- Date
- Sunday, June 6, 2027
- Start time
- 8:00 AM (earliest wave)
- Location
- 17404 Lake Chabot Road, Castro Valley, CA 94546
- Area
- East Bay, SF Bay Area
- Distances
- 5KHalf marathon
- Course
- Trail (dirt or single-track on at least part of the course)
- Price
- $40 to $65 plus the platform's processing fee
- Next price increase
- Sunday, June 6, 2027: Half marathon $65 → $70
- Registration
- Open. Opened August 1, online signup closes Sunday, June 6, 2027
How to register
Registration is on RunSignup. Pick your distance, add any extras, and you'll get a confirmation email with your bib details. Sign up by June 6 to pay $65 instead of $70.
Course and race notes
RACE INFO: We are so excited to celebrate the 43rd annual Lake Chabot Trail Challenge Half Marathon and 5K. This race is well regarded amongst serious trail runners in the outlying areas. The race begins at 8am for the Half Marathon and 8:30am for the 5K.
From the race's own listing. Check the race website for the course map and parking.
Source: RunSignup public race API, refreshed 2026-10-17. Details can change; the registration page is the final word.