Diablo Trails Challenge
Race Date
Apr 4, 2026
Location
Walnut Creek, CA
The Experience
50K, half marathon 10K and 5K.
Logistics
Race Day
Saturday, April 4, 2026
Start Time
7:30 AM
Start Location
1700 Castle Rock Road, Walnut Creek, CA, 94598
Course Info
Course Type
Loop Course
Terrain
road
Difficulty
Ultra-Flat
Elevation Gain
0'
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Quality Score
Solid Pick557 years running
~160 finishers a year
growing or steady
13% returning runners
4 timing sources
runners from 4 states
winner 1:33:00
typical high 66°F
Race Day Weather
5-year historical avgStart (Low)
45°
Afternoon (High)
66°
Pleasant conditions — light layers at start, comfortable by finish
0.0"
Precipitation
9 mph
Wind
68%
Humidity
Historical Finish Times
How 1,369 finishers actually crossed the line across 7 years.
Most recent
2026
Total finishers
1,369
Median time
2:46:59
Latest turnout
243
States
18
Turnout by year
2018–2026
Hover the histogram to inspect specific finish times.
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