Doomsday - Cool, CA

DEC
13
2025
Doomsday Trail Run in Cool, CA on December 13, 2025 offers a rugged 50K and an energetic Half Marathon on scenic, hiker friendly trails. Entries are limited to 200 and all finishers receive a race shirt and a weighted finisher medallion.
Sat 13 Dec 2025
50 kilometers Half Marathon

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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.

50 km
50k
Half Marathon
Half Marathon

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