Lake Chabot Trail Run
Castro Valley, United States • 11 Apr 2026
Event overview
The SPASM Lake Chabot Trail Run takes place on April 11, 2026 in Castro Valley, CA at Lake Chabot Regional Park - Marina. The event offers the following distances:
- 8K
- Half Marathon
- 30K
- Marathon
- 50K
- Kid's Run (6yo & younger, 50 yd dash) - free
Course and markings
The course starts at the Marina and circles Lake Chabot and the surrounding hills. Loops are color coded: the 8K is the yellow loop, the half marathon is the pink loop, the 30K is pink plus yellow, the marathon is the pink loop twice, and the 50K is the marathon plus the 8K. The route is marked with ribbon about every 200 yards; polka-dot flagging indicates turns and blue ribbons mark wrong-way junctions. Headphones are allowed on dirt-road sections only and are not permitted on single-track trail, when crossing paved roads, or when receiving aid.
Elevation gains and surface composition by distance:
- 8K: elevation gain 380 ft; single track 16%, dirt road 12%, asphalt 72%.
- Half Marathon: elevation gain 1,450 ft; single track 14%, dirt road 60%, asphalt 26%.
- 30K: elevation gain 1,830 ft; single track 14%, dirt road 48%, asphalt 38%.
- Marathon: elevation gain 2,900 ft; single track 14%, dirt road 60%, asphalt 26%.
- 50K: elevation gain 3,280 ft; single track 14%, dirt road 53%, asphalt 33%.
Logistics, aid, and awards
Check-in and bib/shirt pickup occur on race day; participants are asked to arrive about 45 minutes before their event. Parking is $5 per vehicle. Drop bags are allowed for the 30K, marathon, and 50K at the start/finish. All events have an 8.5 hour time limit; the marathon and 50K include a mid-course cut-off at the 13-mile point.
Fully stocked aid stations are placed every 4 to 5 miles with fruit, salty snacks, candy, water, and Skratch electrolyte drink. Runners are advised to carry at least 20 oz. of water between aid stations. The event is cupless; participants should bring their own fluid container. T-shirts are provided to pre-registered runners, all finishers receive a custom medal, and 50K finishers receive a custom coaster. Overall top three finishers in each distance receive awards and race credits. Visit the organization's website for the most recent information.