Lake Chabot Trail Challenge 2026

The Lake Chabot Trail Challenge 2026 takes place on June 7, 2026, at Lake Chabot in Castro Valley, California. Located at 17404 Lake Chabot Rd, the event offers participants a choice between a scenic trail half marathon and a paved 5K run. June in Castro Valley typically brings warm, sunny Mediterranean weather, though runners should be prepared for varying conditions as the event runs rain or shine. Participants can expect a challenging course featuring diverse terrain, ranging from hilly dirt fire roads with views of Mt. Diablo and the San Francisco Bay to more gentle, rolling paved paths.

What race distances and formats are available?

• →Half Marathon: A trail-based loop course consisting mostly of dirt fire roads with sustained climbs and descents.
• →5K: A mostly paved, out-and-back course featuring gentle rolling hills.

What is the event schedule?

• →Bib Pickup: Starts at 7:00 AM at the Willow picnic site.
• →Half Marathon Start Time: 8:00 AM.
• →5K Start Time: 8:30 AM.

How much does registration cost?

• →Half Marathon Early Registration: $65
• →Half Marathon Race Day: $70
• →5K Early Registration: $40
• →5K Race Day: $45

Note: Race day payments are accepted via cash, check, or Venmo only.

What is included with registration?

• →Chip-timed race results.
• →Finisher medals for all participants.
• →T-shirts (guaranteed for those who register by May 10, 2026).
• →Access to race photography provided by Darrell Lavin Photography.

What awards are presented?

• →Finisher medals for all participants who complete the course.
• →Age group awards for the top 3 finishers in each division.

What support and facilities are available on the course?

• →Half Marathon: Water stations, first aid, and radio support are available. A 3.5-hour time limit is in effect.
• →5K: One water station and first aid are available.
• →Finish Area: Located at the Willow picnic site.

What should runners be prepared for regarding terrain and weather?

• →The Half Marathon is a legitimate trail run with uneven footing, significant climbs, and exposure on ridge sections; trail shoes and personal hydration are highly recommended.
• →The 5K is more beginner-friendly but includes rolling hills.
• →The event is held rain or shine, and no refunds will be issued due to weather.