Hundred·Atlas
CalendarMapRacesSubmit a Race

Hundred·Atlas

CalendarMapRacesSubmit a Race
By stateBy monthWS qualifiersHardrock qualifiersFirst hundred
AboutTermsPrivacyContact

Race data compiled from public sources; dates change — always confirm with the race organizer. Terrain: Mapzen/AWS Open Data, USGS 3DEP.

CO
← The index

Mountain region

100 mile races in Colorado

14 hundred-mile ultras in Colorado — mapped, dated, and rated.

14 races4 qualifiers3 lotteriesSee them on the map ↗
AUG7'26

High Five

Lake City, CO

▲ 38,000 ftLoop
AUG14'26

San Juan Softie

Durango, CO

▲ 18,500 ftLoop
AUG22'26

Leadville

WS

Leadville, CO

▲ 18,000 ftOut & backLottery
SEP18'26

Run Rabbit Run

WSHR

Steamboat Springs, CO

▲ 20,000 ftOut & back
SEP26'26

Sangre de Cristo

Westcliffe, CO

▲ 20,000 ftOut & back
JUN5~'27

Great Divide

Divide, CO

▲ 16,000 ftLoop
JUN5~'27

Mace's Hideout

Beulah, CO · 101 mi

▲ 19,000 ftLoop
JUL25'26

Creede

Creede, CO

▲ 19,000 ftOut & back
JUL10'26

Hardrock

WSHR

Silverton, CO

▲ 33,000 ftLoopLottery
JUL17'26

High Lonesome

WSHR

Nathrop, CO

▲ 22,000 ftLoopLottery
JUL17'26

Ouray

Ouray, CO

▲ 43,000 ftOut & back
JUN20'26

Ring the Springs

Colorado Springs, CO

▲ 16,000 ftLoop
JUL10'26

Silverheels

Como, CO

▲ 19,300 ftPoint to point
TBA

Divide

Georgetown, CO

▲ 29,000 ftOut & back

Nearby states

MontanaIdahoWyomingNevadaUtahArizonaNew Mexico

Planning by calendar instead? Browse hundred-milers by month.