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5K races in Boulder County (2026-27)
Updated
2 5k races are coming up in Boulder County in the next 90 days; the next is Colleen De Reuck XC Classic on Saturday, October 31 in Boulder. 4 5k races are listed in Boulder County for the next 12 months; the next one starts from $15.
All DenverDenver (40)Boulder County (4)Denver Suburbs (72)Foothills & Mountains (9)Fort Collins & Loveland (7)
By date
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from $15
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from $40Goes up Nov 21
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Reg. closed
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Reg. closed
Quick answers
How many 5k races are in Boulder County in the next 3 months?
2 5k races are listed in Boulder County between October 17 and January 15. The next is Colleen De Reuck XC Classic on Saturday, October 31 in Boulder.
What is the cheapest 5K in Boulder County right now?
Colleen De Reuck XC Classic on October 31 has the lowest listed entry fee in the next 90 days: $15. Prices are before the registration platform's processing fee.
When does the next early-bird price end for 5k races in Boulder County?
Alpine Bank Boulder Thanksgiving Day 5K: the 5K goes from $40 to $45 after November 21.
Are there 5k races in Boulder County this weekend?
None are listed for October 17 to October 18. The next is Colleen De Reuck XC Classic on Saturday, October 31 in Boulder.