I Ain't Scared (of 5k)
Saturday, October 31, 2026, first start 9:15 AM, in Thornton (Colorado and 108th Ave). Distances: 5K. Entry from $45; the 5K goes from $45 to $50 after October 18.
- Date
- Saturday, October 31, 2026
- Start time
- 9:15 AM (earliest wave)
- Location
- Colorado and 108th Ave, Thornton, CO 80233
- Area
- Denver, Denver & Boulder
- Distances
- 5K
- Course
- Road or path
- Price
- $45 plus the platform's processing fee
- Next price increase
- Sunday, October 18, 2026: 5K $45 → $50
- Registration
- Open. Opened November 1, online signup closes Saturday, October 31, 2026
How to register
Registration is on RunSignup. Pick your distance, add any extras, and you'll get a confirmation email with your bib details. Sign up by October 18 to pay $45 instead of $50.
Course and race notes
Dress up and run spooky and silly at the I Ain't Scared (of 5k) in Thornton! Fun music, Halloween snacks and costumes galore!! This event only comes around once every few years when Halloween lands on a weekend. You don't want to miss it!
From the race's own listing. Check the race website for the course map and parking.
Source: RunSignup public race API, refreshed 2026-10-17. Details can change; the registration page is the final word.