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
The 9-mile route: a real trail run with steady climbing, but a manageable day if you're comfortable on your feet for a couple of hours.
Key facts
013-hour time limit
02Course cutoff at 11:00
Create a free training plan for the Calero Trail Run (Winter) 15 km
7-day free trial, no card required
The course
The route
San Jose
Distance15km
Total climb534m
StartElevation
0 kmDrag map to rotate14.5 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
01Kathryn Greenberg01:49:168.2 km/h
02Megan Violand01:50:328.1 km/h
03Samantha Stone01:55:177.8 km/h
4
Women finishers
1:52:55
Median time
8.0 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) 15 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) 15 km plan targets
Typical sessions
15 km with 534 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) 15 km plan.
7-day free trial, no card required.
Other races at Calero Trail Run (Winter)
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