Fourmidable
Auburn, United States • 21 Feb 2026
FOURmidable, Feb 21, 2026
FOURmidable is a trail running event held in Auburn, California, in the Sierra Nevada foothills. The event features multiple on- and off-trail distances that run through local terrain around Auburn.
Distances offered:
- 50K
- 35.5K
- 1/2 Marathon
- 13K
Prize money for 2026 is funded by runner donations matched 100% by the event organizer up to $3,000. The pooled amount will be split equally by gender, and each gender’s share will be distributed 50% to first place, 30% to second place, and 20% to third place in the 50K and other applicable categories. The total prize pool depends on donations collected by race day.
A course record award applies to the 50K: an extra $500 will be given to the first runner who breaks the current course record in each gender. Current 50K course records are 3:29:31 for the male category and 4:06:58 for the female category.
Registration closes Thu, Feb 19 at 11:59 PM PT. Visit the organization's website for the most recent information.