Trail Running Calendar United States 2025-2026

The Dirty December Trail Run, held in San Diego, California, is a festive holiday trail running event featuring multiple race distances: a full marathon, half marathon, 10K, and a unique 6-hour hill climb challenge. The course includes significant elevation gains—approximately 3,500 feet for the mar..

Bad Santa Trail 5K takes place at Addison Oaks County Park in Leonard, Michigan. The course blends dirt and blacktop trails with rolling hills, offering a festive 5K run or walk through winter scenery. Trail conditions can include snow, ice, or mud, so participants are encouraged to wear trail shoes..

Located in Memphis, Tennessee, Moccasin 24 Hour Run invites participants to run as many miles as they can within a 24-hour window on a 4-mile loop at the Wolf River Trails. The event features a family-friendly 4-mile run for kids with a guardian, plus 24-hour and relay options. The start/finish area..

Icicles on the Moon 7 Miler is a night trail race in Lock Haven, Pennsylvania, at Zindel Park near the caretakers house. The event offers a 7-mile main race and a 5K option, both using local trails around the reservoir. Runners must wear a headlamp and be prepared for winter conditions. The 7-mile c..

Jupiter Ridge Sand Spur is a winter ultramarathon in Jupiter, Florida, set in the Jupiter Ridge Natural Area, a protected coastal scrub dune site in Palm Beach County. The 9th edition offers Lunacy 30k Night Run (four 4.5-mile loops, about 18 miles with ~1,000 feet of dune climbing), Lunacy 50k (day..

Rattlesnake Mountain Challenge takes place at Huffaker Hills Trailhead in Reno, Nevada. The event offers a 5k race and a Virtual 5k, both all-trail courses through the Huffaker Hills area. The course is described as entirely trail-running, offering a scenic, nature-friendly atmosphere.The race is US..

Round the Bay Relay and Ultra is a 36.8-mile race around Choctawhatchee Bay on Florida’s Emerald Coast, encompassing Fort Walton Beach, Destin, Niceville, Valparaiso, Shalimar, and surrounding areas. The 15th annual event begins at The Island, the host hotel and new starting line, offering two optio..

Brazen Racing’s Almost New Year’s Eve is a trail-running event at Lake Chabot in Castro Valley, California. Runners may choose from a Half Marathon, 10K, or 5K, with hikers and walkers welcome. The race navigates Lake Chabot’s scenic trails, delivering a festive, outdoor atmosphere as participants c..

Mo Big Butt 50 K is a South Carolina ultramarathon run by the Runner From Hell community. In its 32nd edition, about 25 starters tackle a 50‑kilometer course on a familiar local route, with self-timing and no aid. Parking is typically at the organizer’s yard, and the course is kept by volunteers and..

The Summit Showdown is a challenging trail running event held in Dacula, Georgia, at Little Mulberry Park. Scheduled for December 28, 2025, it offers two race distances: a 10 Mile course with approximately 1,400 feet of vertical gain and a 5K featuring around 500 feet of elevation gain, including a..

Across the Years is a fixed-time, multi-day running festival at the Peoria Sports Complex in Peoria, Arizona. The event, held December 28 through January 3, features a looped course through the complex’s grounds and stadium, with a 1.42-mile loop used to accumulate distance. Races include a 6-day op..

The Recover From The Holidays 50K is an ultramarathon event hosted by the Huntsville Track Club, held annually at John Hunt Running Park in Huntsville, Alabama. This 50-kilometer race offers runners a challenging post-holiday distance to kickstart their running year. The event emphasizes a supportiv..

Run Undead Ultra Trail Party, hosted by Zombie Trail Races, takes place at Oak Mountain State Park in Pelham, Alabama. The endurance event offers a flat, fast 5-mile loop used for multiple distance options: 25K (3 loops), 50K (6 loops), 50 miles (10 loops), 100K (12 loops), and 100 miles (20 loops)...

The Critter is an endurance running event in Waverly, Iowa, at the Ingawanis Adventure Base. It offers multiple timed options for ultrarunners: 4-hour, 8-hour, and 12-hour formats. While the specific course details aren’t listed, the venue suggests a trail-focused, rugged setting typical of ultramar..

NYE Last Chance Trail Run - CorkScrew Edition takes place in Perryville, Arkansas, on the CorkScrew Loop around Lake Sylvia. The event offers a roughly 10-mile route on service roads around the lake, with shorter distances available. ALL paces are welcome—from walkers and joggers to runners, elites,..

The Auburn Resolution Run is a trail running event held at Overlook Park in Auburn, California. Scheduled for January 1, 2026, it offers multiple race distances including 5K, 10K, 10 miles, and a virtual run option for any distance. This event provides a refreshing and adventurous way to start the N..

Brazen New Year's Day is an annual running event held at Lake Chabot in Castro Valley, California. It offers participants the choice of a half marathon, 10K, or 5K race, all set on scenic trails around the lake. The event is known for its invigorating course featuring challenging ascents and descent..

The Lake Travis New Year's Trail Challenge is a multi-distance running event held at Arkansas Bend Park in Lago Vista, Texas, featuring scenic trails along the Colorado River with limestone bluffs and varied natural terrain. Participants can choose from distances including a 100K and 50K ultramarath..

Doomsday 5K is a 5K trail race at Cliff Cave County Park near Oakville, Missouri. The course starts on pavement, then follows the dirt Spring Valley Trail Outer Loop for most of the race, finishing on pavement, totaling about 5K with roughly 272 feet of elevation gain. The all-dirt Spring Valley Tra..

Just Survive 125 is a 200K self-supported ultramarathon in Florida, running from Hobe Sound Beach to Lake Okeechobee and back along the Lake to Ocean trail. The mostly single-track course traverses diverse ecosystems—from ancient dunes and scrub to pine flatwoods, cypress swamp, and wetlands, with F..