Ralston Creek Half Marathon & 5k
About this race
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!
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 12, 2026: Superior Stocking Run 5K (Superior, Colorado)
January 24, 2027: Yeti Chase 5K/10K (Lakewood, Colorado)
February 14, 2027: Ralston Creek Half Marathon & 5K (Arvada, Colorado)
Pick your distance
Running
Half Marathon
5k Run
5k Youth Entry
5K-5K-5K Winter Run Series
Series entry gets you into all three Winter Series events: December 12 - Superior Stocking Run 5k January 24 - Yeti Chase 5k February 11 - Ralston Creek 5k
5k-10k-Half Winter Run Series
Series entry gets you into all three Winter Series events: December 12 - Superior Stocking Run 5k January 24 - Yeti Chase 10k February 14 - Ralston Creek Half Marathon
Typical race-day weather
Based on 11 years of Open-Meteo archive data for this event's race dates in Arvada, plus the 3 days either side.
The sun rises at 6:53 AM and sets at 5:35 PM local time (MST) in Arvada on February 14, 2027 — 10h 41m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
Done this event?
If you've participated in this event, share your experience with other runners
Other races near Arvada
Different organizers, within 40 miles, in the next three months
Apex Foundation Trick or Trot 5K & Halloween Hunt
Wwe Run With The Wolves
Lisa Nelson’s Mustang Stampede 5K
Strides for Sierra 5K run/walk
🏃 Plan Your Next Race in Arvada
Find upcoming events by distance:
- Arvada 5K Races 19 races
- 10K Run Events in Arvada 6 races
- Arvada Half Marathons 6 races
- Arvada Running Calendar 2026 23 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 23 Arvada events
Spotted something wrong? Tell us and we'll fix it.