California · 50K · Half Marathon
Doomsday
Doomsday is a 50K and half marathon event held in Cool, California. Its next confirmed date is Saturday, December 12, 2026. About 80 runners take part across all distances.
- Race day
- December 12, 2026
- Location
- Cool, CA
- Field size
- ~80 runners
Race details
- Date
- Saturday, December 12, 2026
- Location
- Cool, California
- Distances
- 50K, Half Marathon
- Field size
- About 80 runners
- Course
- 5100 ft gain
- Registration
- facebook.com
Registration, course & weather
- Start time
- 7:30 AM PST
- Course profile — 50K
- Loop course; Trail surface; 5100 ft gain, 5100 ft loss (estimated from third-party elevation data)
- Course profile — Half Marathon
- Loop course; Trail surface; 1250 ft gain, 1250 ft loss (estimated from third-party elevation data)
About the Doomsday
Doomsday in Cool, CA.
More half marathons in California
Coming up next, by confirmed date.
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Guides from the RaceRove blog
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Doomsday: common questions
- When is the Doomsday?
- The next confirmed date is Saturday, December 12, 2026.
- Where is the Doomsday held?
- In Cool, California.
- What distances does the Doomsday offer?
- 50K and Half Marathon.
- How many people run the Doomsday?
- About 80 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 Doomsday?
- Registration is handled by the organiser at facebook.com. Entry fees, caps and deadlines are set there.
- What time does the Doomsday start?
- 7:30 AM PST.
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.