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 71 races.

71 races

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

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

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

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

Adams 12 Five Star 5k for Wellness

Five Star Fun Run
2018-05-05 - 08:00
North America / USA / Mountain Region / Colorado / Brighton
Shorter than 10 km race
Road Running Solo

Adams 12 Five Star 5k for Wellness

Five Star 5K (untimed)
2018-05-05 - 08:40
North America / USA / Mountain Region / Colorado / Brighton
5k race
Road Running Solo

Adams 12 Five Star 5k for Wellness

Five Star 5K (timed)
2018-05-05 - 08:30
North America / USA / Mountain Region / Colorado / Brighton
5k race
Road Running Solo
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