The 2026 event has concluded.

Mt. Umunhum Trail Marathon

San Jose, CA, USA · February 7, 2026
partly-cloudy-day53°·62° high·Light·Dry
9
Weather
Course
FAQ
History

Race Day Weather

partly-cloudy-day
53°at start
65° high
Breezy
Dry

Cool and comfortable, hydrate wisely

Runners will face a temperature range from 52°F to 65°F, with 81% humidity and a dew point of 51°F. Winds will be light at 7 mph from the SW, providing minimal impact. Given the humidity, it's advisable for runners to adjust their pace conservatively and prioritize hydration throughout the race.

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Race Info

Website
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Course Map

Course Map Unavailable

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FAQ

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When is the 2026 Mt. Umunhum Trail Marathon?

The 2026 Mt. Umunhum Trail Marathon will be held on Saturday February 7, 2026.

Is the Mt. Umunhum Trail Marathon a Boston Marathon Qualifier?

No, the Mt. Umunhum Trail Marathon is NOT a Boston Marathon qualifier.

What will the weather be like for the 2026 Mt. Umunhum Trail Marathon?

The forecast calls for a high of 65°F and a low of 52°F with a 0% chance of rain.

Historical Weather

Based on 4 years of data
Avg Temp
61°F
L:48° H:61°
RunScore
8
Conditions
Rain Freq
0%
0 of 4 yrs
Wind9mph
Dew45°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults

2025 Mt. Umunhum Trail Marathon

Cloudy skies throughout the day with morning rain.

2025
cloudy
55°/61°-
8

2024 Mt. Umunhum Trail Marathon

Cloudy skies throughout the day with late afternoon rain.

2024
cloudy
48°/58°-
9

2023 Mt. Umunhum Trail Marathon

Cloudy skies throughout the day with rain.

2023
partly-cloudy-night
49°/65°-
7

2022 Mt. Umunhum Trail Marathon

Partly cloudy throughout the day.

2022
partly-cloudy-night
41°/62°-
8

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