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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.

Iron Heart Ultra

St James, MO, US · February 13, 2027 (in 119 days)
Registration open 100 Mile50 Mile100K10K20K50K5K

Iron Mountain

Damascus, VA, US · September 4, 2027 (in 322 days)
On the calendar 50 Mile40 miles30 miles16 miles

Iron Will 100

Junction City, KS, US · September 18, 2027 (in 336 days)
Registration open 100 Mile50 Mile31 miles

Iron Will Backroads

Enterprise, KS, US · May 29, 2027 (in 224 days)
Registration open 100.35 miles50 Mile50K

Island View - Endurance Run

Goleta, CA, US · October 24-25, 2026 (in 7 days)
Registration open 100 Mile100K50K25K12K

Isle du Bois Trail Run

Pilot Point, TX, US · December 5, 2026 (in 49 days)
Registration open 33 miles20 miles10 miles4 miles

Jack Bristol Lake Waramaug Ultra Races

Kent, CT, US · April 25, 2027 (in 190 days)
Registration open 50 Mile100K50K

Jackpot Ultras

Henderson, NV, US · February 19-21, 2027 (in 125 days)
Registration open 100.489 miles100 Mile50.814 miles100K12 Hour24 Hour48 Hour6 Hour

Jacks 50K/24k/12k Trail Race

Palm Coast, FL, US · October 25, 2026 (in 8 days)
Full 12K24K50K

James River Trail Runs

Gladstone, VA, US · April 10, 2027 (in 175 days)
Registration open 50 miles30 miles10 miles50K

Javelina Jangover Night Runs

Scottsdale, AZ, US · September 18, 2027 (in 336 days)
On the calendar 45.2 miles30.1 miles15.1 miles8.9 miles4.5 miles

Javelina Jundred

Fountain Hills, AZ, US · October 31 to November 1, 2026 (in 14 days)
Waitlist only 100 Mile62 miles19 miles

Jed Smith

Sacramento, CA, US · February 6, 2027 (in 112 days)
Registration open 50 MileMarathonHalf Marathon30K50K

JFK 50 Mile

Boonsboro, MD (start) / Williamsport, MD (finish), US · November 21, 2026 (in 35 days)
Full 50.2 miles

John Holmes Trail Run

Brooksville, FL, US · October 3, 2026 (14 days ago)
Ran · this year's race is done. distances not checked yet

Jupiter Ridge Sand Spur

Jupiter, FL, US · December 26, 2026 (in 70 days)
Registration open 31.5 miles18 miles13.5 miles

Just Survive 125

Hobe Sound, FL, US · January 1-3, 2027 (in 76 days)
Registration open 125 miles

JW Corbett Trail Races

Loxahatchee, FL, US · April 10, 2027 (in 175 days)
Registration open 50 Mile18 miles50K

Kaniksu Trail Runs

Frater Lake, WA, US · June 12, 2027 (in 238 days)
Registration open 45.85 miles28.94 miles18 miles13.5 miles100K

Kansas Rails-to-Trails

Ottawa, KS, US · October 24, 2026 (in 7 days)
Registration open 100 Mile50 MileMarathonHalf Marathon100K50K

Kessel Run Ultra

Fruita, CO, US · November 7, 2026 (in 21 days)
Registration open 50 Mile40 miles31 miles20 miles10 miles

Kettle Moraine 100

La Grange, WI (start/finish at the Nordic Trailhead near Whitewater, WI), US · June 12-13, 2027 (in 238 days)
On the calendar 100 Mile100K38 miles50K

Kettlebell Kountdown

Pelham, AL, US · October 10, 2026 (7 days ago)
Ran · this year's race is done. 31 miles

Kettlefoot

Mountain City, TN, US · June 5, 2027 (in 231 days)
Registration open 31 miles15.46 miles8.77 miles

Keweenaw Ultramarathon

Houghton, MI, US · November 7, 2026 (in 21 days)
Registration open 15.38 miles50K
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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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