Calero Trail Run - Winter
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Event details
The Calero Trail Run - Winter is set for Saturday, December 6, 2025, at Calero County Park in San Jose, California. The event offers multiple trail distances:
- 50K
- Trail Marathon
- 25K
- Half Marathon
- 15K
- 10K
- 5K
- Mile
- Kids Run
Race-day bib pick-up and on-site registration are available. Course maps and detailed route descriptions are published for each distance. The event address is 23205 McKean Road, San Jose, CA 95120. Some GPS searches may direct to the Calero reservoir boat launch; the race uses the Calero Park entrance off McKean Road, not the reservoir entrance.
Course and logistics
Courses include single-track trails, hills, and dirt paths, with oak trees, exposed sections, and panoramic views in places. The 13-mile loop is the basis for several distances; longer events use reversed sections and additional out-and-back segments. Courses will be marked with ribbons, signs, and gypsum. Aid stations will be available, and all finishers receive a commemorative medal. Cutoff points are set along the course at miles 13, 17, 21 (Rancho Aid Station), 26, 28.5, and 31. Visit the organization's website for the most recent information.