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Ultras

Ultras, and what they ask of you

Cutoffs, crew access, drop bags, and where your people can park. Nothing here needs an account.
Free, and always will be. NavRun makes money from race-day planning for runners who want it, never from this. Ultras change constantly, sometimes the morning of. Always confirm with the race director and the official website before you rely on anything here.
Not sure which one yet? Watch one first. Course previews and films, made by people who were out there.
883 races

Every race we hold Twenty five at a time. Search a race by its name, or by the name it used to have.

NK50k

Greenbush, WI, US · April 3, 2027 (in 168 days)
Registration open 25K50K

No Bull Around

Pierce, NE, US · May 14-16, 2027 (in 209 days)
Registration open 12hrs24hrs3hrs48hrs6hrs

No Business 100

Jamestown, TN, US · October 23-24, 2026 (in 6 days)
Waitlist only 100.2 miles

No Hands Trail Run

Auburn, CA, US · January 9, 2027 (in 84 days)
Registration open 31.3 miles20.9 miles13.5 miles4.8 miles

No Mans 50K

Triangle, VA, US · March 6, 2027 (in 140 days)
Registration open 15.62 miles50K

No Mans Land Trail Run

Lake Charles, LA, US · October 17, 2026 (today)
Registration closed 7.78 miles25K50K

No Name Trail Races

Agoura, CA, US · October 24, 2026 (in 7 days)
Registration open 30.4 miles13.4 miles6 miles

No Shame Shindig

Pierce, NE, US · June 12, 2027 (in 238 days)
On the calendar 50 MileMarathonHalf Marathon50K

Noble Canyon 50K/15K

Pine Valley, CA, US · September 5, 2026 (42 days ago)
Ran · this year's race is done. 31.43 miles9.93 miles

Noche Trail Runs

Junction, TX, US · July 10-11, 2027 (in 266 days)
Registration open 39 miles26 milesHalf Marathon13 miles5K

Norris Ultra Dam Hard Trail Race

Norris, TN, US · November 14, 2026 (in 28 days)
Registration open 50K25K

North Texas Ultra

Jacksboro, TX, US · February 6, 2027 (in 112 days)
Registration open 62 miles52 miles31 miles15.52 miles10K5K

NYC Trail Mix

Staten Island, NY, US · November 14, 2026 (in 28 days)
Registration open 49.8 miles31 miles13.1 miles

O'Neill Park Trail Races

Trabuco Canyon, CA, US · May 15, 2027 (in 210 days)
On the calendar 31.7 miles26.4 miles18 miles13.4 miles6.2 miles

Oak Flats Picnic Trails

Tijeras, NM, US · September 12, 2026 (35 days ago)
Ran · this year's race is done. distances not checked yet

Oak Mountain 50K

Pelham, AL, US · April 3, 2027 (in 168 days)
Registration open 32.5 miles14.03 miles6.2 miles

Oakwood 24 at Lakeside Retreats

Raleigh, NC, US · November 21, 2026 (in 35 days)
Registration open 12 Hour Challenge2 hour c24 Hour Challenge4 hour challenge5K6hrs

OBrien Trail Races

Marine on St Croix, MN, US · September 26, 2026 (21 days ago)
Ran · this year's race is done. distances not checked yet

OCC

Orsieres, Valais, CH · August 27, 2026 (51 days ago)
Scheduled 60K

Ode to Laz Michigan Backyard Ultra

Holly, Michigan, US · July 17, 2027 (in 273 days)
Registration open Last Person StandingOak Flats 3HR

Oil Creek 100 Trail Runs

Titusville, PA, US · October 10-11, 2026 (7 days ago)
Registration open 100.6 miles62 miles31.1 miles25K

OK Hundred

Wilburton, OK, US · March 13, 2027 (in 147 days)
Registration open 100 Mile40 miles20 miles100K

Old Baldy Ultra

Concan, TX, US · March 6, 2027 (in 140 days)
Registration open 6.2 miles3.37 miles20K30K50K

Old Dominion 100 Mile Endurance Run

Woodstock, VA, US · June 5, 2027 (in 231 days)
On the calendar 100 Mile

Old Pueblo Endurance Runs

Sonoita, AZ, US · March 6, 2027 (in 140 days)
Registration open 49.75 miles32.5 miles
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How this gets better. Every race here was read off the race's own pages and sourced fact by fact. Where nobody has checked something, it says so instead of guessing.
See something wrong or out of date? Open the race and use the form at the bottom of its page.
Are you the race director? The same page has a form that comes straight to us, and we write back.
Anything else: [email protected]
Got one on the calendar?

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