September ultramarathons in United States (East)

Flat looped course with variable time limits by age, featuring veteran ultrarunners and a strategic focus on endurance and pacing

Rocky, rooty 4.63-mile trail loop at Lake Z with steep climbs, water crossings, and 303 feet of climb per loop in Dahlonega

Technical 50K course in Camden Hills with over 7,600 feet of climbing, six major peaks, rugged trails, stream crossings, and panoramic vistas

Scenic 2.1-mile trail loop with 190 feet of elevation gain per lap through lush arboretum woods; multiple timed ultras and on-site camping options

Mostly flat 50K and 50-mile courses on scenic New England trails at DCR Great Brook Farm State Park, featuring roots, rocks, and fall foliage.

Scenic 3.2-mile trail loop with 380 feet of elevation gain on Gateway trails, flexible solo or team formats, 3 to 12-hour timed options in Old Fort, NC

Out-and-back ultramarathon along the Pinellas Trail from St. Petersburg to Tarpon Springs and Dunedin, covering over 46 miles of scenic Florida landscapes.

71-mile mountain loop on the Massanutten Trail with ridgeline traverses and valley views in George Washington National Forest

2.5-mile grass and dirt loop with gentle terrain and minimal elevation, set within 178 scenic acres at the USATF-sanctioned Escambia County Equestrian Center.

Flat and non-technical twelve-loop 50k course around rural Cherry Hill Farm in Gorham, Maine

Flat, shaded urban paved trail with multiple out-and-back laps and open street crossings; low-key atmosphere, no crowds, generous time limit

Damascus start and finish, with Virginia Creeper Trail, technical singletrack, Iron Mountain ridgeline, and roughly 8,000 feet of climbing.

Historic cattle farm setting, 4.44-mile loop through pastures and forest trails, moderate elevation, single track twists, roots, rocks, and wildlife sightings

Scenic forested loops at Pineland Farms, 4.2-mile double-track trails with moderate elevation changes

Technical 50K on twisty singletrack with roots, rocks, and switchbacks, scenic landmarks including waterfall and caves, 4,500 feet of elevation gain

Flat, mostly grassy 2.5-mile loop with gentle hills at Escambia County Equestrian Center, minimal elevation change and easy crew access

Scenic 4-mile loop with 500 feet of elevation gain per lap in Sugar Hill State Forest, featuring rolling woodland terrain and Fire Tower Area views

Big’s Back Yard Ultra format: 4.167-mile hourly laps on forest trails, stream crossing, ancient glacial esker, open-field climbs and descents.

12-hour ultrarun on a 5-mile loop with 95% rustic single and double track, slight elevations, flat stretches, flexible pacing, aid stations, and tent areas