Road · 10K
Boulderthon
Boulder, CO
Boulderthon is a road race of 6.2 miles (10 km) in Boulder, Colorado. The next edition is in September 2027; its day hasn't been announced. The field is about 1,912 runners.
There are 58 other upcoming races up to a half marathon in Colorado.
6.2miDistance
1,912runnersField
77°Flow 50°FTypical race day
Questions about Boulderthon
When is Boulderthon 2027?
Boulderthon 2027 is in September 2027; its day hasn't been announced yet.
Where is Boulderthon?
Boulderthon is held in Boulder, Colorado.
How long is Boulderthon?
Boulderthon is 6.2 miles (10 km).
What is the weather usually like at Boulderthon?
Around Boulderthon's date, the day's high is typically about 77°F (25°C) and the low about 50°F (10°C), averaged over recent years.
What other races up to a half marathon are there in Colorado?
Other upcoming races up to a half marathon in Colorado include Above the Clouds Ultra (October 3, 2026), Sage Burner Trail Race (October 3, 2026) and The Bear Chase (October 3, 2026).
Other races in Colorado
- Boulderthon 5K · Sep 2027, TBD
- Break of Dawn North Table Trail Race 10 Mile · Sep 2027, TBD
- Mayor's Cup 5k/10k 10K · Sep 2027, TBD
- Ouray Mountain Trail Run 13 Mile · Sep 2027, TBD
- Estes Epic Half Marathon · Sep 2027, TBD
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