Doomsday - Cool, CA
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Event overview
Doomsday is a trail running event in Cool, CA held on December 13, 2025 at the Cool Staging Area (7200 Saint Florian Court). The event offers the following distances:
- 50K
- Half Marathon
Registration closes December 9, 2025. Entry is limited to 200 runners in total. Live tracking and real-time results are provided by UltraLive.net. All finishers receive a race shirt and a weighted finisher's medallion. Top-three men and top-three women in each distance receive custom three-dimensional trophies.
Course and logistics
The 50K course has about 5,100 feet of elevation gain/loss and multiple aid stations at miles 8.88, 13.9, 20.9, 23.1, and 27.9. The Half Marathon has about 1,250 feet of gain/loss and one aid station at mile 8.88. Cutoff times are 9.5 hours for the 50K and 5 hours for the Half Marathon. Courses are described as hiker and back-of-the-pack friendly; trekking poles are allowed.
Packet pick-up: Friday, December 12, 3:00–7:00 PM at Auburn CrossFit, 890 High Street, Auburn, CA; and race morning at the Cool Staging Area. Parking fees are not included; participants must display a Golden Poppy Pass or purchase a day-use pass for $10 (exact cash). Route maps and GPX files are available from event mapping providers such as ultraPacer, Strava, Footpath, and AllTrails. Visit the organization's website for the most recent information.