Embark on an unforgettable journey at the Muir Woods Trail Run, formerly known as the Muir Woods Mountain Challenge, set for July 18, 2026, in the breathtaking landscape of Stinson Beach, California. This race, offering challenging 30K, Half Marathon, and 10K distances, is a true test for both seasoned and novice mountain runners alike. Prepare for an immediate and rigorous ascent up the infamous Willow Camp hill, climbing 2,000 feet in just over two miles, quickly transitioning from sea level into the lush, towering redwood forests of Muir Woods National Monument and Mt. Tamalpais State Park.

The course is a trail runner's dream, featuring technical dirt trails and fire roads, with long grinding hills, rocky and rooty descents, numerous steps, and exhilarating twists and turns. As you navigate the single-track Coastal Trail, you'll be treated to panoramic views of Stinson Beach and the vast Pacific Ocean. Half Marathon and 30K participants will delve deeper into the redwood groves, tackling the legendary Dipsea Trail and Steep Ravine, complete with wooden ladders and natural staircases, before a thrilling descent back to the Stinson Beach finish line. The 10K course, with an elevation gain of 1,950 feet, the Half Marathon with 3,450 feet, and the 30K boasting 4,950 feet of gain, promise a rewarding challenge. Typical race day conditions in mid-July bring highs around 82°F and lows around 54°F, ideal for a mountain adventure.

Inside Trail Racing provides well-stocked, cupless aid stations with an array of energy gels, chews, Stroopwafels, salty snacks, fruit, and hydration mixes, though runners are encouraged to carry a 20oz bottle. Known for its supportive atmosphere and limited capacity of 300 runners, this event fosters a strong sense of community amidst some of Northern California's most stunning scenery, from babbling brooks and waterfalls to ancient redwoods and ocean vistas. The Muir Woods Trail Run is more than just a race; it's an immersive exploration of Marin County's natural beauty, praised by runners for its challenging yet incredibly scenic trails.