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All-Out Kooky-Spooky

Halloween 5K race Half Marathon

What’s Happening?

F rom the base of Table Mountain and Colorado's spectacular foothills, All-Out Multicourse presents our 14th annual Kooky-Spooky, benefiting the Colorado National Kidney Foundation office, from Jefferson County's NAAC Stadium… easily accessible from several nearby highways. These 5K, 10K & Half Marathon courses will hug the shores of Arvada's Blunn Reservoir via the Ralston Creek Trail and will challenge the beginner and veteran athlete alike! Of course, we'll still be celebrating the Halloween spirit so re-use your Halloween costume (or take advantage of those post-Halloween sales) for our official costume contest. And especially revel in the extra hour of sleep you get as Nov. 2 is the end of daylight savings time!

This family- and dog-friendly event includes:

The flexibility of running or walking 5K, 10K, or half marathon distances to meet your fitness goals and so you can participate with your friends and family
An awesome, super-soft tech running shirt, full-color medal, and customized bib for all distances
Chip timing and accurately measured courses
Awesome post-race meal including breakfast burrito and chocolate milk (and cider, if it's cold)
Lots of free course and finish line photos

We are inclusive and support athletes of all abilities, including no time limit on the run/walk and accessible toilets in the venue

Save 25% by registering for all three All-Out fall events at the same time by September 13!

All-Out matches all athlete donations to the benefiting charity, the National Kidney Foundation

F rom the base of Table Mountain and Colorado's spectacular foothills, All-Out Multicourse presents our 14th annual Kooky-Spooky, benefiting the Colorado National Kidney Foundation office, from Jefferson County's NAAC Stadium… easily accessible from several nearby highways. These 5K, 10K & Half Marathon courses will hug the shores of Arvada's Blunn Reservoir via the Ralston Creek Trail and will challenge the beginner and veteran athlete alike! Of course, we'll still be celebrating the Halloween spirit so re-use your Halloween costume (or take advantage of those post-Halloween sales) for our official costume contest. And especially revel in the extra hour of sleep you get as Nov. 2 is the end of daylight savings time!

This family- and dog-friendly event includes:

The flexibility of running or walking 5K, 10K, or half marathon distances to meet your fitness goals and so you can participate with your friends and family
An awesome, super-soft tech running shirt, full-color medal, and customized bib for all distances
Chip timing and accurately measured courses
Awesome post-race meal including breakfast burrito and chocolate milk (and cider, if it's cold)
Lots of free course and finish line photos

We are inclusive and support athletes of all abilities, including no time limit on the run/walk and accessible toilets in the venue

Save 25% by registering for all three All-Out fall events at the same time by September 13!

All-Out matches all athlete donations to the benefiting charity, the National Kidney Foundation

More about All-Out Multicourse Productions
Endurance event company providing 5K, 10K, and half marathon events in the Denver area
When & Where
Nov 2, 2025, 9:00am to 1:00pm Timezone: MST
$48.70


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