California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 370 exciting trail runs across the region. Find your next trail run in California below and join the trail community at these great events!
May 2027
Trail ultramarathon in Almaden Quicksilver County Park offering 50K and 100K routes with substantial elevation and staffed aid stations.
Trail race at Cheeseboro/Palo Comado Canyons offering 10K and 21K singletrack courses, aid stations, medals, and a post-race festival with awards.
Trailquake in Saratoga on Mother's Day offers 5K, 10K, a half marathon and a hiker division on redwood and pine forest trails. Finishers receive custom medals and shirt options.
Community run and walk at Pinto Lake County Park on May 9, 2027, offering 1k, 5k, and 10k distances to benefit Pajaro Valley Shelter Services.
Multi day trail ultramarathon in Los Olivos, CA from May 12 to 16, 2027 with looped dirt courses, camping, timed options, and aid stations.
Two-day Spartan weekend at Big Bear Mountain Resort with Sprint, Super, Beast and kids races on high-altitude, climb-heavy terrain and a Trifecta option.
May 15 2027 trail races at Skyline Wilderness Park in Napa offering 10K, 21K, 30K and a long ultra with on course aid and camping options.
Trail runs at O'Neill Regional Park offering distances from 10K to 50K on well marked singletrack and fire roads through shaded canyon terrain.
A trail ultra in Napa on May 15, 2027 with a full 50 mile course and a new one loop 25 mile option across Skyline Wilderness Park and Suscol Headwaters.
A race day in El Sobrante with a half marathon, 10K, 5K and a hiker division through the hills of Wilcat Canyon; registration windows and fees vary by distance.
Trail Run at Sly Park on May 15, 2027 offers distances from 5K to 50K, centralized parking at Scales Parking Lot, and finishes at Waterfall Trailhead for most races.
May 16 2027 Gorgonio View Trail Run at Big Bear Mountain Resort features a Trail 10K on singletrack through high altitude pine forest with mountain views.
Mud Factor's Seriously Fun 5K mud and obstacle run returns to Mahon Ranch in Elk Grove on May 16, 2027, with adult and KIDZ family waves and required waivers for participants.
Trail event in Los Gatos offering 50K, 30K and 10K at Skyline Ridge with proceeds donated to UCSF cancer research.
Second annual Mission Trails Twilight Runs feature 50K and 25K loop races plus a 5K out-and-back, starting near sunset at Mission Trails and limited to 300 runners.
Community fundraiser at Big River State Park in Mendocino featuring 5K and 10K runs, a 5K walk, a kiddie race, river swim and paddle events.
High altitude trail ultras near Bishop, California offering distances from 6K to 100K on exposed dirt roads with aid stations and variable mountain weather.
Trail races at Diablo State Park in Clayton, CA, with distances from a 50 yard kids dash to a 50K, measured with a Rolatape surveyor's wheel.
Obstacle course weekend at Toro Park near Salinas, CA with Sprint 5 km (20 obstacles), Super 10 km (25 obstacles), kids races and spectator access.
Trail races in the Angeles National Forest featuring a 50k with 5,317 ft gain and a 13.1-mile half-marathon on Pacifico Mountain.