Napa Valley Trail Marathon
Race Day Weather
Cool start, warming quickly
Runners will face a temperature increase from 59°F at the start to a warm 86°F by the finish. With a gentle wind from the NW at 6 mph and moderate humidity at 55%, pacing adjustments will be essential. Runners should consider starting conservatively and increasing hydration frequency as temperatures rise.
Pace Calculator
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 2026 Napa Valley Trail Marathon?
Is the Napa Valley Trail Marathon a Boston Marathon Qualifier?
What will the weather be like for the 2026 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 |
|---|---|---|---|---|---|
2025 |  | 48°/62° | - | 50° | |
2024 |  | 46°/57° | Light | 48° | |
2023 | | 40°/61° | - | 44° |