Miwok 100K

Stinson Beach, CA, USA · May 1, 2027
partly-cloudy-day53°·64° high·Breezy·Dry
7
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Race Day Weather

partly-cloudy-day
53°at start
64° high
Breezy
Dry

Comfortable temps, warming through the race, moderate wind

Mild 53°F temps at gun time mean comfortable early miles without overheating risk. Temperatures rising to 64°F through the course will gradually increase perceived effort in the second half. Moderate winds around 14mph may affect pacing on open sections of the course. Moderate humidity at 68% is worth noting for effort level, especially in later miles.

Race day forecast available in 210 days
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Pace Calculator

Distance: 62.1mi
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Race Plan

Get your personalized Miwok 100K race plan

True Effort pacing, weather-adjusted mile splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide — all personalized to your goal and race-day conditions.

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Race Info

The Miwok 100K Trail Race is a 62.2 miles (100.1 km) long ultramarathon that takes place annually in southern Marin County, California, typically on the first Saturday of May.

The race starts and ends in the town of Stinson Beach. Almost all of the course is on fire roads and single-track trails, first to the south of Stinson Beach and then to the north. Runners climb a total of approximately 11,800 feet (3,600 m).
Wikipedia

FAQ

When is the 2027 Miwok 100K?

The 2027 Miwok 100K will be held on Saturday May 1, 2027.

What is the time limit for the Miwok 100K?

The time limit for the Miwok 100K is 15.5 hours.

What will the weather be like for the 2027 Miwok 100K?

The forecast calls for a high of 63°F and a low of 53°F with a 2% chance of rain.

Historical Weather

Based on 4 years of data
Avg Temp
57°F
L:52° H:61°
RunScore
7
Conditions
Rain Freq
50%
2 of 4 yrs
Wind12mph
Dew49°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
cloudy
54°/62°-
7
2025
partly-cloudy-night
52°/64°-
7
2024
cloudy
49°/56°Light
7
2023
cloudy
53°/62°Light
7