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Summer half marathons near Denver (2027)
11 half marathons on the calendar from June to August, starting with Colorado 13er (Half Marathon/10k/5k) on Sunday June 6. 8 of them publish an upcoming price increase, so signing up early saves money.
All summer races5K races (21)10K races (13)Half marathons (11)Trail races (5)
By date
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Colorado 13er (Half Marathon/10k/5k)
Sun Jun 6 · 6:30 AM · Louisville · Denver Suburbs
5K10KHalf marathonTrail
from $35Goes up Mar 1 -
from $35Goes up Dec 13
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Run Juneteenth Day 5K/10K/13.1 Denver/Aurora
Sat Jun 19 · 7:00 AM · Centennial · Denver Suburbs
1 mile5K10KHalf marathon
from $30 -
Slacker Half Marathon-Relay-4-Mile Races
Sat Jun 26 · 7:30 AM · Georgetown · Foothills & Mountains
4 milesHalf marathon
from $35Reg. closed -
from $35Goes up Jan 11
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Summer Splash Prairie Dog Half, 10k, & 5k
Sat Jul 17 · 6:30 AM · Castle Rock · Denver Suburbs
5K10KHalf marathonTrail
from $39Goes up Apr 18 -
Heatwave Half Marathon/5K/10K - Denver
Sat Jul 17 · 7:00 AM · Denver · Denver
1 mile5K10KHalf marathon
from $22Goes up Jan 19 -
Bound for Boston Marathon & Half Marathon - Denver
Sun Aug 1 · 6:30 AM · Denver · Denver
Half marathonMarathon
from $45Reg. closed -
from $35Goes up Feb 8
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from $39Goes up May 17
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Pioneer Prairie Dog Half, 10k & 5k
Sun Aug 22 · 7:15 AM · Westminster · Denver Suburbs
5K10KHalf marathon
from $39Goes up May 24