Find your race Upcoming Find a Qualifier

Search Dashboard Saved Races Calendar

Helping the trail running community discover, plan for, and thrive at the world's best trail races.

Find Races

Search all trail races
Explore collections
Race series
Race qualifiers

Races by Location

Colorado trail races
California trail races
Utah trail races
Arizona trail races
Washington trail races
All US trail races

Lottery Odds

Western States 100
Hardrock 100
High Lonesome 100
UTMB
All calculators

Company

About
Roadmap
Terms of service
Privacy policy

Feedback

Send Feedback
Feature Requests
Report a Bug

© 2026 Trailrace.co. All rights reserved.

Built on bad decisions in Boulder, CO.

Muir Woods Mountain Challenge

3 Race Events10K, Half Marathon, 30K

Inside Trail Racing

Stinson Beach, California, United States

Muir Woods Mountain Challenge 10K

Muir Woods Mountain Challenge 10K

Jul 18, 2026

Muir Woods Mountain Challenge 30K

Muir Woods Mountain Challenge 30K

Jul 18, 2026

Muir Woods Mountain Challenge Half Marathon

Muir Woods Mountain Challenge Half Marathon

Jul 18, 2026