All-Out Kooky-Spooky
Golden, Colorado's Kooky-Spooky half marathon offers a festive Halloween-themed run with a scenic reservoir course.
Race Date
Nov 1, 2026
Location
Golden, CO
Quick facts
- Date
- Sunday, November 1, 2026
- Location
- Golden, Colorado
- Distance
- Half marathon (13.1 mi) + 10K, 5K, 13.1 Miles
- Course
- Loop Course
- Terrain
- Mixed
- USATF certified
- Not listed
- Finishers on record
- 2,713
Highlights
Good For
Atmosphere
Course
The Experience
The All-Out Kooky-Spooky half marathon, now in its 15th year, winds along the shores of Arvada's Blunn Reservoir, utilizing the Ralston Creek Trail. This scenic course begins at the base of Colorado's foothills, offering a refreshing escape from the city.
The event embraces its Halloween theme with an official costume contest, encouraging runners to don their favorite spooky attire. As a bonus, the race falls on November 1st, granting participants an extra hour of sleep thanks to the end of daylight savings time.
With a median field size of around 518 finishers, the Kooky-Spooky half marathon attracts runners from approximately 16 states, though only about 10% are repeat participants. The course is designed to challenge both beginners and seasoned athletes, making it a welcoming event for a wide range of runners.
Race-provided description
From the base of Table Mountain and Colorado's spectacular foothills, All-Out Multicourse presents our 15th annual Kooky-Spooky 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 for our official costume contest. And especially revel in the extra hour of sleep you get as Nov. 1 is the end of daylight savings time!
Logistics
Race Day
Sunday, November 1, 2026
Start Time
9:00 AM
Giveaway
Beanie
Start Location
19500 W 64th Pkwy, Golden, CO, 80403
Course Info
Course Type
Loop Course
Terrain
mixed
Scenery
Lake River, Park
Surface
Paved
Difficulty
Ultra-Flat
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Course Map
Quality Score
Standout7613 years running
~518 finishers a year
growing or steady
10% returning runners
6 timing sources · 3 photos
runners from 16 states
winner 1:19:23
typical high 55°F
Race Day Weather
5-year historical avgStart (Low)
30°
Afternoon (High)
55°
Ideal racing weather — cool and comfortable
0.0"
Precipitation
10 mph
Wind
54%
Humidity
Historical Finish Times
How 2,713 finishers actually crossed the line across 13 years.
Most recent
2025
Total finishers
2,713
Median time
2:21:40
Latest turnout
261
States
27
Turnout by year
2018–2025
Hover the histogram to inspect specific finish times.
Race Photos
Frequently asked
When is the All-Out Kooky-Spooky?
The All-Out Kooky-Spooky is held on Sunday, November 1, 2026, starting at 9:00 AM.
Where does the All-Out Kooky-Spooky take place?
It takes place in Golden, Colorado.
What distances does the All-Out Kooky-Spooky offer?
The half marathon (13.1 miles), plus 10K, 5K, 13.1 Miles.
Is the All-Out Kooky-Spooky course flat and good for a PR?
The All-Out Kooky-Spooky is a ultra-flat, loop course course.
How many people run the All-Out Kooky-Spooky?
HalfRuns has finish records for 2,713 runners who have completed the All-Out Kooky-Spooky.
HalfRuns editorial — independent, no paid placement.
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