Lace up for the Napa Wilderness Trail Runs on May 16, 2026, a Bay Trailrunners event set amidst the stunning landscapes of Skyline Wilderness Park in Napa, CA. This race offers an unforgettable trail experience for every level of runner, with distances including a challenging 50K, a rigorous 30K, a rewarding 21K (half marathon), and an accessible 10K. Runners can anticipate typical race day conditions with pleasant highs around 73°F and lows near 48°F, alongside a minimal 2% chance of precipitation, creating ideal running weather.

The courses at Skyline Wilderness Park wind through scenic, rugged terrain, featuring a mix of fire roads and moderately technical dirt trails, complete with singletrack, long rolling hills, and exhilarating descents. Prepare for steep uphill sections, especially on the renowned Rim Rock Trail, which rewards runners with expansive, sweeping valley views, including distant glimpses of Mount Diablo to the East, Mount Tamalpais to the West, and Mount Saint Helena to the North. While the 10K and 21K routes offer a moderate challenge, the 30K and 50K distances, with the 50K boasting approximately 5,547 feet of elevation gain, are designed to test experienced trail runners. Aid stations, strategically placed every 5 to 9 miles, provide a touchless experience with volunteers offering prepackaged snacks and pouring fluids, including plant-based options and popular items like Gu gels, pretzels, and Skratch Hydration Mix. This is a cupless event, so remember to bring your own hydration vessel.

Beyond the challenging and beautiful course, the Napa Wilderness Trail Runs at Skyline Wilderness Park offer convenient amenities, including on-site restrooms, showers, and camping options for those looking to extend their stay. The start and finish lines are easily accessible, with parking included in your registration when entering via the designated south gate. A pre-race briefing will be held 15 minutes before each distance's start, ensuring all participants are well-informed. Come discover why this event, now in its fifth year at this exceptional location, is a favorite among the Bay Area trail running community.