Spasm Lake Chabot Trail Run
Updated
Saturday, April 17, 2027, first start 8:20 AM, in Castro Valley (Lake Chabot Regional Park - Marina). Distances: 2 miles, 5 miles, Half marathon, 17.9 miles, Marathon, 50K. Entry from $60 to $90; the 5 miles goes from $60 to $70 after April 11.
- Date
- Saturday, April 17, 2027
- Start time
- 8:20 AM (earliest wave)
- Location
- Lake Chabot Regional Park - Marina, Castro Valley, CA 94546
- Area
- East Bay, SF Bay Area
- Distances
- 2 miles5 milesHalf marathon17.9 milesMarathon50K
- Course
- Trail (dirt or single-track on at least part of the course)
- Price
- $60 to $90 plus the platform's processing fee
- Next price increase
- Sunday, April 11, 2027: 5 miles $60 → $70
- Registration
- Open. Opened April 22, online signup closes Saturday, April 17, 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 April 11 to pay $60 instead of $70.
Course and race notes
The course starts at the Marina and travels around the popular Lake Chabot reservoir and surrounding hills. Great course for first-time trail runners! (Distances are accurately measured using a Rolatape® surveyor's measuring wheel.).
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.