In 4 days · Sat, Sep 19, 2026
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Saturday, September 19th, 2026
10170 Church Ranch Way, Westminster CO
Half · 10K · 5K
51–79°F · low rain risk
See last 10 years
On this date: rain 0 of the last 10 years
2025
46–79°F
dry
2024
49–85°F
dry
2023
53–77°F
dry
2022
53–88°F
dry
2021
59–88°F
dry
2020
55–86°F
dry
2019
53–85°F
dry
2018
57–86°F
dry
2017
52–85°F
dry
2016
51–85°F
dry
Best months to race in Colorado →
Race-day forecast · Saturday, Sep 19
Rain likely · 62–77°F
Saturday, Sep 19starts near 62°F · 50% chance of rain · wind up to 11 mph
About this race
Race Overview
- Event: All-Out Fall Fest
- Date: September 19, 2026
- Location: 10170 Church Ranch Way, Westminster, CO
- URL: Race Registration
Race Highlights
- Scenic Route: One of Colorado's favorite trails meets one of its most glorious parks.
- Annual Event: This is the 9th annual Fallfest.
- Course Description: Courses wind southwest along Big Dry Creek Trail.
- Viewpoints: Remarkable sight of Standley Lake with the Flatirons on the horizon.
Additional Series
- Endless Series: The Endless Series sidekick in September.
- Related Event: September's sidekick is Beat the Heat.
- More Information: For more details, visit the respective links.
Course map
Hotels for race weekend
Live prices near the start line, Sep 18 – 20, 2026.
Train with a club
Run clubs near Westminster to train with before race day.
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