A weekend with 78 North American ultramarathons on the calendar, highlighted by Wasatch Front 100, Superior Fall Trail Races, Mogollon Monster, Boulder Field Ultras and Ultra Trail Harricana of Canada.
Wasatch Front 100 resumes as the final Grand Slam stop: 36-hour cutoff, ~24,000 ft up and 23,000 ft down, starts 5 a.m. Friday.
Mogollon Monster 101 miles across high Sonoran desert and ponderosa forests: ~16,000 ft gain, 38-hour cutoff, now a Western States qualifier.
Weekend calendar covers 78 North American ultras with regional listings across West, Midwest, South and East including several backyard ultras, 50Ks and multi-day events.
# Weekend overview The second weekend of September lists 78 North American ultramarathons on UltraRunning Magazine's race calendar. The week's highlights focus on long, technical point-to-point races that challenge runners with steep climbs, technical single-track and variable weather. Featured races include the Wasatch Front 100 (UT), Superior Fall Trail Races (MN), Mogollon Monster 100 (AZ), Boulder Field Ultras (PA) and Ultra Trail Harricana of Canada (QC).
# Featured races
City. Established in 1980 and serving as the final stop on the Grand Slam of Ultrarunning, the course is point-to-point through the Wasatch Range. Expect altitude, technical terrain, and large net moves: approximately 24,000 feet of climbing and 23,000 feet of descent. Runners start at 5 a.m. Friday and have 36 hours to finish. The event remains a Hardrock 100 qualifier.
Rim, moving through high Sonoran desert and ponderosa pine forest. The route includes six significant climbs and descents, with grades reaching 30–45% in places and roughly 16,000 feet of total elevation gain. The race starts at 6 a.m. Saturday with a 38-hour cutoff. For 2026 the race offers Western States and Hardrock qualifiers.
Ultra Trail Harricana of Canada appears in the featured list for this weekend's regional calendar. The event is part of the wider weekend listing of North American ultras and contributes to the international entries on the calendar.
# Regional event highlights The weekend calendar also includes multiple regional races across the West, Midwest, South and East. Examples listed for the West include PDX 50-50 (Portland, OR), Snowbasin by UTMB (UT) and Rut Mountain Runs (MT). Midwest events include Hawk Hundred (KS), Hocking Hills Trail Run (OH) and Rib Mountain Trail Races (WI). Southern listings include Southwest Groovin in the Aspens (Flagstaff, AZ) and Caney Fork Ultra (TN). Eastern events include Grand Canyon of the South (VA) and various backyard ultras and 50Ks.
# Practical notes for readers
# Bottom line This weekend favors long, technical courses with significant elevation change. Whether you're following elite finishes, tracking friends on course, or choosing a fall race for next year, the calendar spans point-to-point 100-milers, multi-loop 50Ks and grassroots backyard events across North America.
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