How many races in Colorado are there in 2027?

There are 6 upcoming races in Colorado listed on 42Cal, from February 2027 through June 2027. The count updates automatically as races are added.

When is the best time for races in Colorado?

Most of the 8 races on this list (5 of them) fall in February and April and May 2027.

Which race in this list has the least elevation gain?

Hot Chocolate 15K/5K Denver in Denver is the flattest race on this list, with about 98 ft of total elevation gain — based on the 8 of 8 races here with elevation data on file.

How current is this list?

This list was last refreshed on October 26, 2026. Race dates, locations, and course details are updated continuously as organizers confirm changes, so this page reflects the calendar as of that date.

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Race Collection

Races in Colorado 2027

There are 6 upcoming races in Colorado on the 42Cal calendar, from February 2027 through June 2027.

Upcoming races

February 2027 – June 2027

Date range

Countries

591 ft

Median elevation

Race data last updated October 26, 2026.

Upcoming Races in Colorado 2027

6 races

Feb 14, 2027
Registration Open
Colorado Springs Super Half Marathon
Colorado Springs, Colorado, United States
Half Marathon
Also: 5K
See full guide
Apr 18, 2027
Registration Open
Horsetooth Half Marathon
Fort Collins, CO, United States
Half Marathon
See full guide
May 2, 2027
Registration Open
Colorado Marathon
Fort Collins, CO, United States
Marathon
Also: Half Marathon, 10K, 5K
See full guide
May 16, 2027
Opening Soon
Colfax Marathon
Denver, CO, United States
Marathon
Also: Half Marathon, 5K
See full guide
May 31, 2027
Registration Open
BolderBOULDER
Boulder, Colorado, United States
10K
See full guide
Jun 6, 2027
Registration Open
Steamboat Marathon
Steamboat Springs, Colorado, United States
Marathon
Also: Half Marathon, 10K
See full guide

Recently Run

2 races

Compare These Races

Race	Date	Location	Distance	Elevation	Status
Colorado Springs Super Half Marathon	February 2027	Colorado Springs, United States	Half Marathon	60 m	Registration Open
Horsetooth Half Marathon	April 2027	Fort Collins, United States	Half Marathon	280 m	Registration Open
Colorado Marathon	May 2027	Fort Collins, United States	Marathon	180 m	Registration Open
Colfax Marathon	May 2027	Denver, United States	Marathon	211 m	Opening Soon
BolderBOULDER	May 2027	Boulder, United States	10K	400 ft	Registration Open
Steamboat Marathon	June 2027	Steamboat Springs, United States	Marathon	736 ft	Registration Open
Hot Chocolate 15K/5K Denver	October 2026	Denver, United States	Other	30 m	completed
Boulderthon	September 2026	Boulder, United States	Marathon	603 ft	completed