Colorado · 5K
Ugly Sweater 5K
Ugly Sweater 5K is a 5K event held in Denver, Colorado. Its next confirmed date is Sunday, December 20, 2026. About 2,500 runners take part across all distances.
- Race day
- December 20, 2026
- Location
- Denver, CO
- Field size
- ~2,500 runners
Race details
- Date
- Sunday, December 20, 2026
- Location
- Denver, Colorado
- Distances
- 5K
- Field size
- About 2,500 runners
- Course
- Flat, fast course at Washington Park (~5,280 ft altitude)
- Registration
- runsignup.com
- Official website
- coloradorunnerevents.com
Registration, course & weather
- Registration status
- Open
- Start time
- 9:00 AM MST
- Course profile
- Loop course; Road surface; USATF certified
- Typical race-day weather
- about 29°F at the start, 76% humidity, 6 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked October 7, 2026)
About the Ugly Sweater 5K
A flat, fast holiday 5K around Denver's Washington Park where runners don tacky sweaters, with an ugly-sweater race medal and finish-line expo of vendors, food and cookies.
Rankings and notes
- Rankings and awards
- Official BOLDERBoulder qualifier event; ugly-sweater costume contest
More 5Ks in Colorado
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Guides from the RaceRove blog
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- 4 min read Diplo's Run Club 2026-27: Every City, Date and Course Diplo's Run Club is a 5K with a post-race concert. Every US date for 2026-27 (San Francisco, New York, Los Angeles, San Diego and Phoenix), start times and courses.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Ugly Sweater 5K: common questions
- When is the Ugly Sweater 5K?
- The next confirmed date is Sunday, December 20, 2026.
- Where is the Ugly Sweater 5K held?
- In Denver, Colorado.
- What distances does the Ugly Sweater 5K offer?
- 5K.
- How many people run the Ugly Sweater 5K?
- About 2,500 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the Ugly Sweater 5K?
- Registration is handled by the organiser at runsignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Ugly Sweater 5K?
- Yes — registration is open. $33 (from coloradorunnerevents.com, checked October 7, 2026).
- What time does the Ugly Sweater 5K start?
- 9:00 AM MST.
- What is the course like at the Ugly Sweater 5K?
- Loop course; Road surface; USATF certified.
- What is race-day weather usually like at the Ugly Sweater 5K?
- about 29°F at the start, 76% humidity, 6 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked October 7, 2026).
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.