Boulder Rez Marathon

USATF Certified

Saturday, August 15, 2026

Boulder, Colorado

USATFCourse

Course Information

USATF Certified Course

CO25001MWC · Expires 2035

Certified Course Name

Boulder Reservoir Half Marathon

Net Drop

0.00

m/km

Separation

0.0%

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

Saturday, August 15, 2026

Course

Loop

Also Offers

26.2M19.7M10K run | 26.2M relay

Registration

Race Website

Official race information

Historical Weather

☀

Avg High

85°F

☽

Avg Low

58°F

☂

Precip

0.03 in

🍃

Wind

9.3 mph

48% humidity·Based on 5-year historical data

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Course Information

USATF Certified Course

CO25001MWC · Expires 2035

Certified Course Name

Boulder Reservoir Half Marathon

Net Drop

0.00

m/km

Separation

0.0%

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

Saturday, August 15, 2026

Course

Loop

Also Offers

26.2M19.7M10K run | 26.2M relay

Registration

Race Website

Official race information