2018 - 2019 Colorado Race Calendar in May

Browse our Marathons, Half Marathons, Ultra marathons, Multiday events organized in Colorado during the month of May among 75 races.

75 races

Collegiate Peaks Trail Run

50M Trail Run
2019-05-04 - 06:30
North America / USA / Mountain Region / Colorado / Buena Vista
Ultramarathon
Mountain Trail Running Mountain Multiple loops Solo

Collegiate Peaks Trail Run

25M Trail Run
2019-05-04 - 06:30
North America / USA / Mountain Region / Colorado / Buena Vista
Half Marathon to Full Marathon
Mountain Trail Running Single loop Solo

Greenland Trail 50k

4M Trail Races
2019-05-04 - 08:30
North America / USA / Mountain Region / Colorado / Larkspur
Shorter than 10 km race
Trail Running Solo

Greenland Trail 50k

8M Trail Race
2019-05-04 - 08:00
North America / USA / Mountain Region / Colorado / Larkspur
10 km race to Half Marathon
Trail Running Solo

Greenland Trail 50k

25K Trail Race
2019-05-04 - 07:30
North America / USA / Mountain Region / Colorado / Larkspur
Half Marathon to Full Marathon
Trail Running Solo

Greenland Trail 50k

50K Trail Race
2019-05-04 - 07:00
North America / USA / Mountain Region / Colorado / Larkspur
Ultramarathon
Trail Running Solo

Graffiti Run Denver

2019-05-05 - 09:00
North America / USA / Mountain Region / Colorado / Denver
5k race
Road Running Solo

Quad Rock 50

25 Miles
2019-05-11 - 08:00 To be confirmed
North America / USA / Mountain Region / Colorado / Fort Collins
Half Marathon to Full Marathon
UTMB Qualifier Trail Running Mountain Solo

Quad Rock 50

50 Miles
2019-05-11 - 05:30 To be confirmed
North America / USA / Mountain Region / Colorado / Fort Collins
Ultramarathon
UTMB Qualifier Trail Running Mountain Solo

Rabbit Valley Half

2019-05-11 - 07:30
North America / USA / Mountain Region / Colorado / Fruita
Half Marathon
Desert Trail Running Solo

Tommyknocker 12-Hour & The Mine Shaft Half

12H Relay
2019-05-11 - 06:00
North America / USA / Mountain Region / Colorado / Golden
X-hour race
Trail X-hour Race Relay

Tommyknocker 12-Hour & The Mine Shaft Half

1/2 Marathon
2019-05-11 - 06:00
North America / USA / Mountain Region / Colorado / Golden
Half Marathon
Trail Running Solo

Tommyknocker 12-Hour & The Mine Shaft Half

12hrs
2019-05-11 - 06:00
North America / USA / Mountain Region / Colorado / Golden
X-hour race
Trail X-hour Race Solo

Colorado Women's Classic - Westminster

10 Miler
2019-05-12 - 08:15
North America / USA / Mountain Region / Colorado / Westminster
10 km race to Half Marathon
Road Running Solo Women only

Colorado Women's Classic - Westminster

5k
2019-05-12 - 08:30
North America / USA / Mountain Region / Colorado / Westminster
5k race
Road Running Solo Women only
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