Diablo Summit Stomp
Race Date
Oct 18, 2025
Location
Walnut Creek, CA
The Experience
30K, half marathon, 10K and 5K on El Diablo!
Logistics
Race Day
Saturday, October 18, 2025
Start Time
8:30 AM
Start Location
1700 Castle Rock Rd, 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 Pick507 years running
~115 finishers a year
shrinking
16% returning runners
4 timing sources
runners from 5 states
winner 1:53:36
typical high 76°F
Race Day Weather
5-year historical avgStart (Low)
55°
Afternoon (High)
76°
Warm — hydration strategy is key, start conservatively
0.0"
Precipitation
9 mph
Wind
63%
Humidity
Historical Finish Times
How 814 finishers actually crossed the line across 7 years.
Most recent
2025
Total finishers
814
Median time
2:58:01
Latest turnout
108
States
18
Turnout by year
2018–2025
Hover the histogram to inspect specific finish times.
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