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A kooky Halloween event for all ages and abilities!

All-Out Kooky-Spooky

Sunday, November 2, 2025 9a

JeffCo NAAC, Golden, CO

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Half Marathon

$64.60 incl. $4.60 Fee 9:00AM MST - 1:00PM MST Price increases after May 2, 2025 at 11:59pm MDT

10K

$43.40 incl. $3.40 Fee 9:30AM MST - 1:00PM MST Price increases after May 2, 2025 at 11:59pm MDT

5K

$32.80 incl. $2.80 Fee 9:45AM MST - 1:00PM MST Price increases after May 2, 2025 at 11:59pm MDT
Run anywhere, anytime!

VIRTUAL Half Marathon

$43.40 incl. $3.40 Fee Get your alumni credit & the event SWAG
Run anywhere, anytime!

VIRTUAL 10K

$32.80 incl. $2.80 Fee Get your alumni credit & the event SWAG
Run anywhere, anytime!

VIRTUAL 5K

$27.50 incl. $2.50 Fee Get your alumni credit & the event SWAG

From 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. Along with its Endless Series sidekick in March, Spring Fever, 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!

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 keepsake bibs, personalized if you register by two weeks before the event

Location

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