location_city Arvada
location_on Colorado
flag United States
calendar_today 15 Feb, 2026
directions_run Running
language Official Website
RegisterThe 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 cover 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 hours 45 minutes to complete the course!
Half-Marathon entry is limited to the first 650 registrations. 5K registration is limited to the first 350 entries. Once a distance has filled, we cannot accept any additional entries for that distance.
Your entry fee includes entry into the race, a finisher's medal (for half-marathon runners who complete the course), FREE race photo downloads, fun music, hot cocoa and tasty quesadillas fresh off the grill!!!
Long sleeve adult tech shirts will be included with all half marathon entries. 5k entries will come with a short sleeve t-shirt or an upgrade to a long sleeve tech shirt for $5.
This is also the final race in the Racing Underground Winter Running Series. The three-race series includes the Stocking Run 5K in December, the Yeti Chase 5K/10K in January, and the Ralston Creek Half-Marathon & 5K in February. Choose from the 5K-5K-5K series or the 5K-10K-Half Marathon Series.
WINTER RUNNING SERIES
Series Finisher Awards to all runners who finish all three series races, and Overall Awards to the top series finisher in each age category!
December 13, 2025: Superior Stocking Run 5K (Superior, Colorado)
January 25, 2026: Yeti Chase 5K/10K (Lakewood, Colorado)
February 15, 2026: Ralston Creek Half Marathon & 5K (Arvada, Colorado)
Feb 15, 2026
Distance — 5K
Type — Road running
46 days remaining
Feb 15, 2026
Distance — 10K
Type — Road running
46 days remaining
These values represent the 3-year monthly averages for February in Arvada.
Arvada is a city of about 125,000 in the Denver Metropolitan Area of the U.S. state of Colorado. A former farming community in Jefferson and Adams counties, the city is now a residential suburb of Denver. Olde Town Arvada lies 7 miles (11 km) northwest of the Colorado State Capitol and 9 miles (14 km) east of the Front Range foothills.
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