Date
Sat, 5 Dec 2026
Start
08:00
Venue
Calero County Park, 23205 McKean Rd, San Jose, CA 95120
San Jose, Santa Clara County
Countdown
December
Run the 13-mile loop, then head back out for the 5K course to make up the distance. Two different bites of the same park, with solid climbing in between.
Key facts
01Order: 13-mile course first, then the 5K course
025-hour time limit
03Course cutoff at 13:00
Create a free training plan for the Calero Trail Run (Winter) 25 km
7-day free trial, no card required
The course
One lap, on repeat
San Jose · one lap
Distance25km
Total climb831m
Start · finishOne lap · elevation
0 kmDrag map to rotate25.8 km
Weather
Early-December, San Jose
16°CTypical high
6°CTypical low
-2°CColdest in 20 years
26%Days with rain
Highs around 16°C and lows around 6°C, but it has dropped to -2°C. Rain on 26% of days. Pack for the cold end, not the average.
NASA POWER data, 2006-2025, the week either side of race day
2025 results
Who finishes, and how
#RiderTimeAvg speed
01Bri Kehana03:12:497.8 km/h
02Kristel Flores03:19:567.5 km/h
03Janine Costoella04:08:326.0 km/h
4
Women finishers
3:44:14
Median time
6.7 km/h
Median speed
Women · 2025 results, as published by the organiser.
How fast could you finish?
Get a prediction based on your recent training
Organiser
OrganiserTroy's California Trail Runs
Websitetctruns.com
Instagram@troyscaliforniatrailruns
Running since2012
Training
Training for the Calero Trail Run (Winter) 25 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a Calero Trail Run (Winter) 25 km plan targets
Typical sessions
25 km with 831 m of climbing
Time on feet and fatigue resistance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long runs that build time on your feet
Tempo and threshold sessions to hold race pace
Back-to-back weekend runs for fatigue resistance
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your Calero Trail Run (Winter) 25 km plan.
7-day free trial, no card required.
Other races at Calero Trail Run (Winter)
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