Napa Valley Trail Marathon
Race Day Weather
Cool start — fast day potential, big temp swing, chance of rain
A cool 49°F at the start line is ideal for fast times — expect to warm up quickly once you're moving. Temps will climb significantly to 64°F by later miles, so expect fading conditions as the race progresses. Light winds shouldn't be a major factor for pacing. There's a chance of rain, so have a backup gear plan ready. Moderate humidity at 69% is worth noting for effort level, especially in later miles.
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Race Info
Babbling streams will be your soundtrack as you challenge yourself on the lush single-track within Bothe-Napa Valley State Park. The course is a bit challenging with the hills, streams and rocks - which makes it all the more exciting and rewarding. This state park is a local treasure that is untapped by tourists and located just minutes from the area's great restaurants and wineries. The event is limited to 300 participants and sells out every year so don't wait too long to register! Source
FAQ
When is the 2027 Napa Valley Trail Marathon?
Is the Napa Valley Trail Marathon a Boston Marathon Qualifier?
What will the weather be like for the 2027 Napa Valley Trail Marathon?
Historical Weather
Temperature History
Range of temperatures during race hours for each year.
Detailed History
| Year | Conditions | Low / High | Rain | Dew Point | Score |
|---|---|---|---|---|---|
2026 |  | 52°/83° | - | 53° | |
2025 |  | 48°/62° | - | 50° | |
2024 |  | 46°/57° | Light | 48° | |
2023 | | 40°/61° | - | 44° |