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 55 races.

55 races

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

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

Graffiti Run Denver

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

Colorado Women's Classic - Westminster

Kids Fun Run (100 yards)
2019-05-12 - 08:00
North America / USA / Mountain Region / Colorado / Westminster
Shorter than 10 km race
Road Running Solo Women only

Colorado Women's Classic - Westminster

10k
2019-05-12 - 08:30
North America / USA / Mountain Region / Colorado / Westminster
10k race
Road Running Solo Women only

Hope House Derby Dash 5K & Fun Run

2017-05-06 - 09:30
North America / USA / Mountain Region / Colorado / Arvada
5k race
Running

Quad Rock 50

Quad Rock 50 - 25 Miles
2017-05-13 To be confirmed
North America / USA / Mountain Region / Colorado / Fort Collins
Half Marathon to Full Marathon
Trail Running

Quad Rock 50

Quad Rock 50
2017-05-13 To be confirmed
North America / USA / Mountain Region / Colorado / Fort Collins
Ultramarathon
Trail Running
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