All-Out Dog Days
All-Out Dog Days offers a scenic trail run with a unique canine-friendly atmosphere.
Race Date
Jul 11, 2026
Location
Westminster, CO
Quick facts
- Date
- Saturday, July 11, 2026
- Location
- Westminster, Colorado
- Distance
- Half marathon (13.1 mi) + 10K, 5K, 13.1 Miles
- Course
- Out & Back
- Terrain
- Mixed
- USATF certified
- Not listed
- Finishers on record
- 1,218
Highlights
Good For
Atmosphere
Course
The Experience
The All-Out Dog Days race series, held annually between Denver and Boulder, CO, invites runners to a mid-season challenge on the Big Dry Creek Trail. This event, now in its 13th year, offers a unique twist with a special dog division and a dog-themed costume contest, celebrating the bond between runners and their canine companions.
The course primarily utilizes the Big Dry Creek Trail, known for its soft surface, particularly on the 10K and half marathon routes, making it a pleasant running experience. Runners can expect scenic views of the Flatirons on the horizon as they navigate the out-and-back paths. With an average of around 200 finishers in recent years, the event draws participants from approximately 11 states, creating a diverse yet intimate field. The typical winning time suggests a competitive but accessible race for various skill levels.
Race-provided description
Get ready for a sun-soaked adventure and a fantastic mid-season challenge with our 13th Annual Dog Days 5K, 10K & Half Marathon, benefiting Do Over Dogs! Held in a central location between Denver and Boulder, our courses wind northeast along the scenic Big Dry Creek Trail. As you run, you’ll enjoy breathtaking views of the Flatirons on the horizon. Our trail is perfect for dogs, featuring a generous amount of soft surface along the 10K and half marathon routes. Plus, we have a special dog division to award the fastest pups at each distance and a dog-themed costume contest for extra fun! And continue the challenge by participating in the endless series counterpart, Fa La La, in December.
Logistics
Race Day
Saturday, July 11, 2026
Start Time
7:00 AM
Giveaway
T-Shirt
Start Location
10170 Church Ranch Way, Westminster, CO, 80021
Course Info
Course Type
Out & Back
Terrain
mixed
Scenery
Mountain, Park
Surface
Dirt Trail, Paved
Difficulty
Ultra-Flat
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Course Map
Quality Score
Solid Pick5412 years running
~183 finishers a year
growing or steady
6% returning runners
5 timing sources
runners from 11 states
winner 1:29:30
typical high 91°F
Race Day Weather
5-year historical avgStart (Low)
60°
Afternoon (High)
91°
Hot conditions — adjust pace expectations, prioritize hydration
0.0"
Precipitation
13 mph
Wind
41%
Humidity
Historical Finish Times
How 1,218 finishers actually crossed the line across 12 years.
Most recent
2025
Total finishers
1,218
Median time
2:06:43
Latest turnout
101
States
27
Turnout by year
2018–2025
Hover the histogram to inspect specific finish times.
Race Photos
Frequently asked
When is the All-Out Dog Days?
The All-Out Dog Days is held on Saturday, July 11, 2026, starting at 7:00 AM.
Where does the All-Out Dog Days take place?
It takes place in Westminster, Colorado.
What distances does the All-Out Dog Days offer?
The half marathon (13.1 miles), plus 10K, 5K, 13.1 Miles.
Is the All-Out Dog Days course flat and good for a PR?
The All-Out Dog Days is a ultra-flat, out & back course.
How many people run the All-Out Dog Days?
HalfRuns has finish records for 1,218 runners who have completed the All-Out Dog Days.
HalfRuns editorial — independent, no paid placement.
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