Diablo Trail Marathon

Clayton, CA, USASeptember 7, 2025
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clear-day Clear conditions throughout the day.

Our favorite marathon tested handheld water bottle. Nathan SpeedDraw Plus Insulated Flask.When you buy through our links, we may earn a commission.

Mount Diablo provides spectacular views of the San Francisco Bay Area and surrounding valleys. The 4 mile course is relatively flat and fast within Mitchell Canyon. The longer events are mountainous and very scenic. Source

Area Map

Course Maps

FAQ

When is the 2025 Diablo Trail Marathon?

The 2025 Diablo Trail Marathon will be held on Sunday September 7, 2025.

Community

Historical Weather

RunScore
Run Score: 6
Temp
85°F
Min/Max
61°/85°F
Dew
47°F
Days of Rain
2/12
Wind
11mph
Tap a row for details.
YearConditionsLow / HighRainRunScore
2024
clear-day
60°/ 94°-
Run Score: 8
2023
clear-day
58°/ 87°-
Run Score: 8
2022
rain
63°/ 72°Light
Run Score: 7
2021
cloudy
60°/ 81°-
Run Score: 8
2019
clear-day
67°/ 92°-
Run Score: 7
2018
cloudy
58°/ 79°-
Run Score: 8
2017
clear-day
68°/ 103°-
Run Score: 6
2016
cloudy
61°/ 82°-
Run Score: 8
2015
partly-cloudy-day
65°/ 83°Light
Run Score: 7
2014
cloudy
58°/ 82°-
Run Score: 8
2013
clear-day
56°/ 81°-
Run Score: 8
2012
clear-day
54°/ 82°-
Run Score: 8