All-Out Fall Fest
About this race
One of Colorado's favorite trails meets one of its most glorious parks at our 9th annual Fallfest! As courses wind southwest along Big Dry Creek Trail, the remarkable sight of Standley Lake with the Flatirons on the horizon will come into view. Its Endless Series sidekick in September is Beat the Heat.
Join fellow runners on September 19, 2026 for the All-Out Fall Fest. It's a fantastic Half-Marathon, 10K, 5K featuring a flat and fast course in Westminster.
Pick your distance
Running
Half Marathon
Half marathon athletes will start out heading west on Big Dry Creek Trail toward Standley Lake Regional Park. At about 2.5 miles athletes will begin 4 miles of the gravel trail & road system within the park, including the spectacular views along a north/south dogleg near the dam, then exit the park to continue west toward the south trailhead and the turnaround. As they return the way they came, athletes will skip the dogleg, return to Big Dry Creek Trail and head straight for the finish. 8 opportunities to fuel up (+4 toilets).
10K
10K athletes will leave the office parking lot to head west on Big Dry Creek Trail for 3.1 miles. After turning around, returning the way they came on this out & back course. 4 opportunities to fuel up (+ 2 toilets).
5K
5K athletes will leave the office parking lot to head west on Big Dry Creek Trail for 1.55 miles. After turning around, return the way they came on this out & back course. 2 opportunities to fuel up (+2 toilets).
VIRTUAL Half Marathon
Participate virtually! Get all of the SWAG, including a distance medal, shipped to you the week after the event, maintain eligibility for series finisher award and alumni brag tags, and get distance credit towards the Run Amok Championship!
VIRTUAL 10K
Participate virtually! Get all of the SWAG, including a distance medal, shipped to you the week after the event, maintain eligibility for series finisher award and alumni brag tags, and get distance credit towards the Run Amok Championship!
VIRTUAL 5K
Participate virtually! Get all of the SWAG, including a distance medal, shipped to you the week after the event, maintain eligibility for series finisher award and alumni brag tags, and get distance credit towards the Run Amok Championship!
Weather Overview
These values represent the 13-year monthly averages for September in Westminster.
About Westminster
All-Out Fall Fest takes place in Westminster, Colorado, United States. The local timezone is America/Denver.
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🏃 Plan Your Next Race in Westminster
Find upcoming events by distance:
- Westminster 5K Races Best Westminster routes for beginners and speed work.
- 10K Run Events in Westminster The most popular local distance in Colorado.
- Westminster Half Marathons Top-rated 21.1K courses in the Westminster area.
- Westminster Running Calendar 2026 See all upcoming race dates.
Race information has been sourced from the event's official website and other publicly available resources. For the most up-to-date details, please refer to the official website directly. If you notice any incorrect or missing information, don't hesitate to reach out to us by email.
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