Marathons in Colorado

Browse all 20 upcoming Marathons in Colorado and compare all the nerdy details to find the best race for you.

Nerdy Details

Marathons in Colorado: By The Numbers

For the runners who check their splits more than their email, here are the nerdy details about all Marathons in Colorado in the USA including peak month, race distance popularity, number of races with open registration, and even price range and average entry free across Marathons in Colorado.

  • 0

    Total upcoming races

  • 0

    Races with registration open

  • October

    Peak month by race count

  • 0

    Races in peak month

  • $0

    Minimum entry fee discovered

  • $0

    Maximum entry fee discovered

  • $0

    Average entry fee calculated

  • #0

    Most popular city for Marathons in Colorado

Nerdrunner race data is updated daily. Prices may include sampled data for popular race categories. Popularity rank determined by race count.

Find Your Next Race

Browse All Upcoming Marathons in Colorado

Browse all upcoming Marathons in Colorado below. By default, races are sorted by soonest date. Feel free to narrow your search using race filters or searching by race name.

1 - 20 of 20 races found

Runner FAQs

Frequently Asked Questions About Marathons in Colorado

  • How many Marathons in Colorado are there?

    There are currently 20 upcoming Marathons in Colorado in our database. Race dates are scheduled from July through June 2027. Race data is updated daily.

  • When is the best time of year for running Marathons in Colorado?

    There is no bad month for a race, but October is the peak month for Marathons in Colorado with 6 races on the calendar that month.

  • How many Marathons in Colorado currently have open registration?

    12 of the 20 upcoming Marathons in Colorado in our database currently have open registration. Registration windows vary — some races open entries more than a year in advance, while others don’t open until a few weeks before race day.

  • How much do Marathons in Colorado typically cost?

    Entry fees for Marathons in Colorado vary widely. The average entry fee is $119, though prices range from as low as $8 to as much as $500 depending on the race, location, swag, and when you register. Signing up early almost always gets you the best price. Note that our price estimates may include sampled data, especially for large datasets.