Napa Wilderness Trail Runs
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Napa Wilderness Trail Runs at Skyline Wilderness Park
The Napa Wilderness Trail Runs take place in Skyline Wilderness Park in Napa, California. The event offers multiple trail distances and uses park and Napa Open Space trails, including new sections added for the current event.
Available distances
- 10K : 6.1 miles, ~1,300 ft elevation gain
- 21K (Half Marathon) : 13.9 miles, ~2,600 ft elevation gain
- 30K : 18.2 miles, ~4,000 ft elevation gain
- 50K : listed as 32.4 miles / 52K, ~6,700 ft elevation gain
Course and support notes: aid stations are typically spaced every 5 to 9 miles and will serve Skratch and Cure hydration plus GU gels, with plant‑based options at all stations. There is a roughly 7 mile section on the 30K and 50K with only a water stop; runners must plan to be self-sufficient for that stretch. Volunteers will pour fluids into runners' containers; the event is cupless so runners must bring their own cup, bottle, or hydration pack. Porta‑potties are available near the start/finish; there are no restrooms on course.
Logistics and rules: the $6 parking fee is included with race registration; all participants enter via the South Gate overflow parking area and should have registration available for verification. Crew access is allowed only at the Lake Marie aid station, which is about a 2 mile walk from the start/finish. If a runner drops, there is no transportation from aid stations; the runner is responsible for returning to the start/finish area. Results are posted on UltraSignup within 72 hours. The event is organized by Bay Trailrunners and Trail Squirrel Adventures LLC. Visit the organization's website for the most recent information.
