Date
Sat, 11 Sept 2027
Start
09:00
Venue
Lake Anza, Tilden Regional Park, Berkeley, California 94708
Berkeley, Alameda County
Countdown
September
A trail half marathon that climbs a fair bit (about 850 m), so expect it to run slower than a road half. A solid step up if you've done a 10K.
Key facts
01Starts and finishes at Lake Anza
Create a free training plan for the Berkeley Trail Adventure 21 km
7-day free trial, no card required
The course
The route
Berkeley
Distance21km
Total climb853m
StartElevation
0 kmDrag map to rotate20.0 km
Weather
Mid-September, Berkeley
23°CTypical high
13°CTypical low
10°CColdest in 20 years
3%Days with rain
Highs around 23°C and lows around 13°C, but it has dropped to 10°C. Rain on 3% of days.
NASA POWER data, 2006-2025, the week either side of race day
2026 results
Who finishes, and how
#RiderTimeAvg speed
01Cierra Nelson02:03:3310.1 km/h
02Florence Schlatter02:04:4110.1 km/h
03Karen Forsman02:07:329.8 km/h
43
Women finishers
3:02:50
Median time
6.9 km/h
Median speed
Women · 2026 results, as published by the organiser.
How fast could you finish?
Get a prediction based on your recent training
Organiser
Training
Training for the Berkeley Trail Adventure 21 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 Berkeley Trail Adventure 21 km plan targets
Typical sessions
21 km with 853 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 Berkeley Trail Adventure 21 km plan.
7-day free trial, no card required.
Other races at Berkeley Trail Adventure
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