Ralston Creek Half Marathon & 5k

🏃‍♂️ Race Overview

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 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!

🎟️ Registration Details

• Half-Marathon Limit: Entry is limited to the first 650 registrations.
• 5K Limit: Registration is limited to the first 350 entries.
• Registration Closure: Once a distance has filled, we cannot accept any additional entries for that distance.

🏅 Entry Fee Includes

• Finisher’s Medal: For half-marathon runners who complete the course.
• Race Photos: FREE race photo downloads.
• Post-Race Treats: Fun music, hot cocoa, and tasty quesadillas fresh off the grill!
• Shirts: Long sleeve adult tech shirts 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.

🎉 Post-Race Festivities

The post-race festivities will continue at the nearby Colorado Tap House located just above our 2 &: 11 mile aid station on Ralston Creek trail (14982 W.69th Ave by car) where you can show your race bib any time on race day and receive $2 off a beverage item of your choice. With 30 taps, there are plenty of beer options, but also cider, seltzer, wine, and cocktails. They serve coffee drinks, kombucha, CBD Cider, Tommyknocker N/A Beer, Root Beer, and soft drinks. They also serve small food items and the food truck of the day rolls up at noon!

🏆 Winter Running Series

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.

📅 Series Schedule

• 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)

Series Finisher Awards to all runners who finish all three series races, and Overall Awards to the top series finisher in each age category!