What’s Up in Ultra This Weekend — September 6, 2025

The first weekend of September includes 47 races on the UltraRunning Magazine race calendar. In this week’s What’s Up in Ultra, we highlight ultramarathons in Utah, Minnesota, Arizona, Massachusetts and Alberta, Canada. If you’re a race director and would like your event to be featured in the calendar, register here.

Featured: Wasatch 100 (Kaysville, Utah)

Close to 350 runners will toe the line at the 45th annual Wasatch 100 on Friday, September 5, in Kaysville, Utah. Known for being one of the most challenging 100-mile mountain ultramarathons in the United States, Wasatch boasts over 24,000 feet of climbing, 23,000 feet of descent and altitudes that range from 5,000 to 10,400 feet above sea level. The point-to-point course begins in East Mountain Wilderness Park and traverses the beautiful and rugged central Wasatch Mountains all the way to the pavilion at Soldier Hollow in Wasatch Mountain State Park. On course, runners will have to navigate a variety of terrain, including single-track trails, game trails, scree fields, jeep roads and technical rocky sections, as well as the possibility of extreme weather conditions and encounters with local wildlife. Entrants have 36 hours to complete the 100-mile course for an official finisher’s buckle and 2026 Hardrock 100 qualifier. Live tracking here. Read more.

Other West Events:

Pacific

• Noble Canyon (Pine Valley, CA)
• CTR – Diablo Trail Run (Clayton, CA)
• Mendocino Running Festival (Mendocino, CA)
• Tanri Lake Race (Miramonte, CA)
• Backcountry Rise Trail Run (Toutle, WA)
• GOAT Run (Great Olympic Adventure Trail Run) (Port Angeles, WA)
• Sole Survivor Backyard Ultra – Washington (Richland, WA)
• Tartarus Backyard Ultra (Spokane, WA)
• Dark Divide 100 Miler (Randle, WA)

Mountain

• American Heroes Run (Longmont, CO)
• Devil on the Divide 50K (Empire, CO)

Featured: Superior Fall Trail Races (Two Harbors, Minnesota)

First run in 1991, the Superior 100 is the ninth-oldest 100-mile ultramarathon in the US, and one of the classic Midwest ultras. This year’s 100-mile event kicks off on Friday, September 5, at Gooseberry Falls State Park and takes runners on a scenic yet arduous tour of the remote Sawtooth Mountain Range, as they attempt to reach Caribou Highlands Lodge on Lutsen Mountain via the Superior Hiking Trail. Along the way, runners will be challenged by technical trails, creek crossings, endless rolling hills and the chance of high heat and humidity. For their efforts, runners will be awarded with stunning views of Lake Superior and the surrounding landscape, and a shiny Superior 100 buckle for all sub-38-hour finishers. In addition to the 100-mile race, the Superior Fall Trail Races also feature a 50-mile ultra that takes place on Saturday. Race proceeds help benefit the Superior Hiking Trail Association. Live tracking here. Read more.

Other Midwest Events:

• • Prairie On Fire Backyard Ultra (Noblesville, IN)
  • Firefly Six-Hour Trail Race (Fort Wayne, IN)
  • Hawk Hundred (Lawrence, KS)
  • Run Woodstock (Gregory, MI)
  • Germantown 50k Trail Run (Germantown, OH)
  • Youngstown Ultra Trail Classic (Youngstown, OH)
  • YOTE (Laurelville, OH)

Featured: Mogollon Monster 100 (Pine, Arizona)

The 14th annual Mogollon Monster 100 begins at Two-Sixty trailhead in Payson, Arizona, just 90 minutes from Phoenix. Named after Arizona’s version of Bigfoot, said to inhabit the areas around the Mogollon Rim, the Mogollon Monster 100 is known for its extremely demanding course that features remote terrain, lots of loose rocks, crazy steep climbs and descents, with grades ranging from 30-45% in sections, and over 17,000 feet of cumulative elevation gain. Course highlights include running through diverse ecosystems of the high Sonoran Desert and pine forests. Participants have 38 hours to earn an official finish and a Hardrock 100 qualifier. Live tracking here. Read more.

Other South Events:

Southwest

• Do-Wacka-Do Trail Run (Erick, OK)
• Hula Loop 6-Hour Sunday Series – Race 1 (Hurst, TX)
• Horse Thief Trail Run (Austin, TX)

Southeast

• Rebecca Mountain (Sylacauga, AL)
• S.O.S. (Middleburg, FL)
• Sunshine Endurance Run (Thomaston, GA)
• 24 Hours at Lake Z (Dahlonega, GA)
• Not A Sprint 3-6-12 Endurance Run (Forest City, NC)
• Chasing Trails Ultras Endurance Races (Old Fort, NC)
• Oli Kai (Chattanooga, TN)
• Odyssey Trail Running Rampage (Millboro, VA)
• Hurricane 100K (Hurricane, WV)

Featured: TARC Fall Classic (Carlisle, Massachusetts)

The 2025 Trail Animals Running Club Fall Classic features a 50k and 50-mile ultramarathon races. Both races start and finish on Saturday, September 6, in Carlisle, Massachusetts, at the Hart Barn Ski Center & Field and feature a runnable 10-mile loop course through a fall New England setting of woodlands and cornfields. The 50k and 50-mile runners have 13 hours to complete their races, with access to aid stations every 3-4 miles. In addition to the ultramarathon events, the 2025 Trail Animals Running Club Fall Classic also includes a 20-mile race and a free kids run. Read more.

Other Northeast Events:

• Macedonia Trail Race (Kent, CT)
• The Cross-Connecticut Run for Mental Health Awareness (West Suffield, CT)
• Megunticook Trail Festival (Camden, ME)
• Cherry Hill Farm Ultra (Gorham, ME)
• FallApple (South Mountain Reservation, NJ)
• Old Forge (NY) Ultra Marathon 50K (Old Forge, NY)
• Pine Creek Challenge (Wellsboro, PA)

Featured: Lost Soul Ultra (Lethbridge, Alberta)

Founded in 2000, the Lost Soul Ultra is held in the beautiful river valley and prairies of Lethbridge, Alberta, and features three ultra distances: 100 miles, 100k and 50k. All three races begin and end at Softball Valley in Peenaquim Park and take place on a 50.3-kilometer loop course with 1,200 meters of elevation gain and descent. The 100-milers begin on Friday at 8 a.m. and have 33 hours to complete their race. The 100k participants head out at 8:30 a.m. on Friday and have 21 hours to earn an official finish. And 50k runners start on Saturday at 7 a.m. and must complete their race in under 11 hours. Both the 2025 Lost Soul 100-mile and 100k events are 2026 Western States Endurance Run qualifiers. Read more.

Other Events in Canada and Mexico:

• Black Lung Ultra (Nordegg, AB)
• Walk in the Park (Kamloops, BC)
• Finlayson Arm (Victoria, BC)
• Haliburton Forest Trail Race (West Guildford, ON)
• Ultra-Trail Harricana™ of Canada (UTHC) (La Malbaie, QC)

Email corys@ultrarunning with questions about adding your event to the UltraRunning Magazine calendar.