Castle Rock
Trail Running Calendar near Castle Rock 2026-2027
Explore the top trail runs near Castle Rock for 2026-2027! We've gathered 23 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
October 2026
A 13.1 mile trail race through the Highlands Ranch Backcountry Wilderness in Douglas County with cash prizes and participant race amenities including a shirt, medal, and pancake breakfast.
A backyard ultra at Bear Creek Lake Park where runners repeat a 4.167 mile loop every hour until one remains, up to 11 laps, with a 50 runner field cap.
November 2026
Six-hour timed loop at Sandstone Ranch in Larkspur, CO on an ~8-mile loop with about 765 ft gain and aid roughly every four miles.
December 2026
January 2027
Inaugural 21.6 mile out and back on Rampart Range Road near Sedalia, CO, with 2,627 feet of climbing, winter road surfaces, mandatory gear, and multiple aid stations.
April 2027
A backyard ultra on public trails in Greenland Open Space near Larkspur, Colorado, run as repeated 4.167 mile loops until one runner remains.
Trail races on April 10, 2027 near Highlands Ranch CO offering 21 mile, half marathon, 10 km and 5 km on mostly dirt single track with aid stations.
May 2027
Trail races at Farish Recreation Area in Woodland Park, CO feature a Half Marathon, 10K, 5K and a free 1 mile kids run, with awards and packet pickup options.
Trail ultramarathon in Buffalo Creek, Colorado offering 50 Mile and 50K on soft singletrack with aid stations, limited crew access and live tracking.
A Parker, CO trail event featuring a Dipsea-style staggered 10 km and a Kids 1 mile, with a steep incline, rolling terrain, aid stations, and awards for top finishers.
June 2027
Overnight trail endurance event in Highlands Ranch offering solo ultras and 3 or 5 person 12 hour relays on marked 10.3 and 5.3 mile loops with two aid stations.
August 2027
Trail races at Rampart Reservoir offering 16 mile and 8 mile courses, shuttle service from Merit Academy, limited parking at Rainbow Gulch, horseshoe finisher medals and a membership raffle.
Trail marathon and half at Staunton State Park in Colorado featuring mostly singletrack, significant elevation gain, marked courses, stocked aid stations, and limited fields.