Halloween Fun, Serious Colorado Run.
All-Out Kooky-Spooky
Sunday, November 1, 2026 9a
Ralston Creek Trail, Golden, CO
Half Marathon
Join us for the 15th annual Kooky-Spooky race, featuring a 5K, 10K, and half marathon. Starting from Jefferson County's NAAC Stadium , the courses wind along the scenic Ralston Creek Trail and by Arvada's Blunn Reservoir. Celebrate Halloween by wearing your costume for our official contest, and enjoy that extra hour of sleep as daylight saving time ends! This event is easily accessible from nearby highways, benefits the Colorado National Kidney Foundation, is part of the Endless Series with Spring Fever, and serves as an official BOLDERBoulder Qualifier!
Reasons Why You Should Join Us
- The only Halloween half marathon in the Denver area!
- Groups can run different distances from 5K to half marathon
- A wonderfully challenging course with terrific views of the Front Range that's accessible for all abilities
- Lots of on-course support for every distance, including dogs!
- Tons of free parking and convenient location
- Virtual option if the weather race day doesn't match your training goals
- Enjoy a loop course for the 10K, All-Out's only loop!
- A great costume contest with multiple categories
- Medals for all, including 5K, and free medal engraving to customize your keepsake!
- Full-color bibs,
Location
An official BOLDERBoulder qualifying event!
We are thrilled to announce that Kooky-Spooky has been designated as an official BOLDERBoulder Qualifier event! You can use your finishing time from any distance of this race to qualify for one of the 2026 BOLDERBoulder's qualified waves. For more details on the BB10K qualifying waves, please visit this link.
Benefiting Charity
The National Kidney Foundation (NKF) of Colorado needs your support. NKF's mission is to prevent kidney disease, to improve the health and well-being of individuals and families affected by kidney disease, and to increase the availability of all organs for transplantation. Your donation will help us to enhance the lives of everyone at risk of or affected by kidney disease right here in Colorado.
Partners
