Denver Colfax Marathon

USATF Certified

Sunday, May 17, 2026

Denver, Colorado

USATFCourse

Course Information

USATF Certified Course

CO23004DT · Expires 2033

Certified Course Name

Colfax Half Marathon

Net Drop

0.00

m/km

Separation

0.2%

start to finish

This course is relatively flat with minimal net elevation change. Loop course — start and finish are close together.

View USATF Course Map (PDF)

Race Details

Race Day

Sunday, May 17, 2026

Course

Loop

Also Offers

26.2M10M run | 26.2M relay

Registration

Race Website

Official race information

Historical Weather

☀

Avg High

72°F

☽

Avg Low

45°F

☂

Precip

0.1 in

🍃

Wind

11.7 mph

56% humidity·Based on 5-year historical data

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Course Information

USATF Certified Course

CO23004DT · Expires 2033

Certified Course Name

Colfax Half Marathon

Net Drop

0.00

m/km

Separation

0.2%

start to finish

This course is relatively flat with minimal net elevation change. Loop course — start and finish are close together.

View USATF Course Map (PDF)

Race Details

Race Day

Sunday, May 17, 2026

Course

Loop

Also Offers

26.2M10M run | 26.2M relay

Registration

Race Website

Official race information