California · 35K · 1/2 Marathon · 10K
Reservoir Dogs Trail Run
Reservoir Dogs Trail Run is a 35K, 1/2 Marathon, 10K and 5K event held in Orinda, California. It was last held on October 10, 2026 and is usually run in October; the next date hasn't been announced yet. About 300 runners take part across all distances.
- Usually held
- October
- Location
- Orinda, CA
- Field size
- ~300 runners
Race details
- Last held
- October 10, 2026
- Usually held in
- October
- Location
- Orinda, California
- Distances
- 35K, 1/2 Marathon, 10K, 5K
- Field size
- About 300 runners
- Course
- Gently rolling; organizer-listed 2026 gains are approximately 200 ft (5K), 425 ft (10K), 1,400 ft (Half) and 2,500 ft (35K).
- Registration
- ultrasignup.com
- Official website
- insidetrail.com
Registration, course & weather
- Registration status
- Registration status as last checked September 28, 2026: open
- Start time
- 8:00 AM PDT
- Course profile — 5K
- Loop course; Mostly trail, some road
- Course profile — 10K
- Loop course; Mostly trail, some road; 425 ft gain (official course data)
- Course profile — Half Marathon
- Loop course; Mostly trail, some road; 1400 ft gain (official course data)
- Course profile — 35K
- Loop course; Mostly trail, some road; 2500 ft gain (official course data)
- Typical race-day weather
- about 55°F at the start, 99% humidity, 6 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026)
About the Reservoir Dogs Trail Run
The Reservoir Dogs Trail Run circles the normally permit-only San Pablo and Briones Reservoirs on East Bay Municipal Utility District land near Orinda, offering rolling fire roads and oak-shaded single-track for 5K, 10K, Half Marathon, and 35K fields. The race starts and finishes at the San Pablo Reservoir Boat Launch/Visitor Center and is capped at roughly 300 runners across all distances.
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Reservoir Dogs Trail Run: common questions
- When is the Reservoir Dogs Trail Run?
- The next date hasn't been announced in the listing yet. The race is usually held in October. Check the organiser's website for the official date.
- Where is the Reservoir Dogs Trail Run held?
- In Orinda, California.
- What distances does the Reservoir Dogs Trail Run offer?
- 35K, 1/2 Marathon, 10K and 5K.
- How many people run the Reservoir Dogs Trail Run?
- About 300 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the Reservoir Dogs Trail Run?
- Registration is handled by the organiser at ultrasignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Reservoir Dogs Trail Run?
- Registration status as last checked September 28, 2026: open.
- What time does the Reservoir Dogs Trail Run start?
- 8:00 AM PDT.
- What is race-day weather usually like at the Reservoir Dogs Trail Run?
- about 55°F at the start, 99% humidity, 6 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026).
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