Discover The Best Marathons in Colorado for 2025
Browse our listing of marathons in Colorado to find one that suits your goals. Plus, get training tips.
For a full list of events, check out our calendar.
upcoming marathons in Colorado
May 10, 2025
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Colorado Springs
July 19, 2025
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Silverton
July 19, 2025
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Aspen
August 23, 2025
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Pine
September 20, 2025
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Colorado Springs
September 21, 2025
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Fort Collins
September 28, 2025
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Boulder
October 4, 2025
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Colorado Springs
October 11, 2025
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Fort Collins
October 18, 2025
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Fort Collins
November 1, 2025
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Fort Collins