The Ralston Creek Half Marathon and 5K are back in 2024 and we are excited to announce the Racing Underground Winter Running Series also returns in 2024! Join us at Colorado’s Premier Winter Half Marathon. The Ralston Creek races feature a fun winter half-marathon and 5K run conveniently located on the west side of the Denver Metro Area in Arvada, Colorado. The courses covers a scenic mix of road and bike path over rolling terrain, and an optional early start time for half-marathon runners who expect to take more than 2.5 hours to complete the course! HALF-MARATHON COURSE:The Ralston Creek Half Marathon course follows a mix of roads and bike paths on the west side of Arvada. The opening 5 miles are fairly flat, with a barely noticeable gradual gain in elevation. Miles 5 through 6.5 are rolling, with one good climb leading to the high-point of the course atop Ralston Mesa at 7.75 miles. From there, the course is almost all downhill and flat to the finish, with the exception of a small bump around mile 9 and a very gradual uphill in the last half-mile.
Ralston Creek Half-Marathon & 5K Run
Date
February 15, 2026
Starting Time
9:00 AM
Course
Road
Fees
Visit website for current race fees.
Location
Arvada
Participants
100-500
Terrain
Some Hills
Environment
Urban
Temperature
High: 45°
/ Low: 30°
Overview
Course Description
Half-Marathon aid stations are located approximately every two miles throughout the course (approximate locations are: 2.25, 4.25, 6.5, 9.5, 11.5) All aid stations will have both water and Skratch energy drink. Hammer Gel will be available at miles 4.25 and 9.5. 5K COURSE:The Ralston Creek 5K Run course follows a mix of roads and bike paths on the west side of Arvada. The route starts with a slight downhill in the opening mile, a flat second mile, and a very gradual uphill in the final mile. A single aid station will be located at approximately halfway into the 5K run
Past Results
