Grass Valley
Trail Running Calendar near Grass Valley 2026-2027
Explore the top trail runs near Grass Valley for 2026-2027! We've gathered 27 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
September 2026
Mile Madness is a looped trail endurance event in Auburn, California, held September 18-21, 2026. Timed events run from 3 to 72 hours with a 0.75 mile loop and options including a 100 mile race plus on-site aid and amenities.
Trail event in Auburn, CA on September 27, 2026 featuring a half marathon, 12K and 5K with sections on the Western States Trail.
October 2026
A self guided 50K on the original South Yuba Campground to Bear Valley course in Nevada City, completed anytime during October with results submitted afterward.
Trail runs near Bear Valley and Lake Spaulding with a 50K and a 24 mile option. The 50K includes a summit loop with about 5,700 ft of gain, rocky sections on Signal Peak OHV Road, cupless aid stations, and finisher medals.
Limited-entry fatass style 25 and 50 mile trail run near Foresthill, CA, featuring extensive climbing, off trail navigation, and a shared drop bag location.
Trail races in Nevada City on October 11 2026 include a 13.1 miles half marathon, a 10K and a 5K with mixed terrain, aid stations and views along Deer Creek. Organized by Sierra TrailBlazers and Bear Yuba Land Trust.
Trail running in Cool, California with 5k, 10k and half marathon options on Sierra Foothills trails. Proceeds support Georgetown Divide Ready by 21 and a Camp Taylor scholarship; family packages, childcare, and a post-race breakfast are included.
A remote, unmarked backcountry foot race at Oxbow Reservoir, CA with three unassisted route options from about 15 to 43+ miles.
Trail run at Salmon Falls Ranch with a single lap 10K (10.5K) and a two lap half marathon on single track trails featuring creek crossings, climbs and views. Proceeds support the American River Conservancy.
November 2026
Trail race at Darrington Trail Head by Folsom Lake offering 5K, 10K, 18M and 36M on rocky single-track with rolling hills, aid stations, drop bags, and a 10-hour overall time limit.
December 2026
Trail races in Pilot Hill, CA on Dec 12, 2026 offering distances from 5K to 50K on stony, hilly dirt paths with lake views.
A trail event in Cool, CA on Dec 12, 2026 offering a 50K and Half Marathon with aid stations, GPX maps, finisher medals, and a 200-runner limit.
January 2027
Annual New Year’s Day 5K and 10K run and walk in Chicago Park supporting local firefighters, the 4-H club, and the school PTA.
February 2027
March 2027
Trail races in Auburn and Cool, CA with 5K, 10K, half marathon and 35K courses on the Western States trail, aid stations, and age-group awards.