All-Out Fallfest 10K

Mild 55°F temps at gun time mean comfortable early miles without overheating risk. Temps will climb significantly to 79°F by later miles, so expect fading conditions as the race progresses. Light winds shouldn't be a major factor for pacing.

Race day forecast available in 322 days

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Distance: 6.2mi

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A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.

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Race Info

The Fall Fest 10K covers 6.2 miles on the Saturday of race weekend in Westminster, Colorado. The organizer plans to run it at Standley Lake Open Space, with views of the Flatirons over the lake, on a new 2027 course to be published in mid-January 2027. It starts at 8:30 AM, after the half marathon and before the 5K.

Website

Race weekend

Saturday, September 18

8:00 AMHalf Marathon (13.1 mi)

8:30 AM10K (6.2 mi)

8:40 AM5K (3.1 mi)

Course Map

FAQ

When is the 2027 All-Out Fallfest 10K?

The 2027 All-Out Fallfest 10K will be held on Saturday September 18, 2027.

What will the weather be like for the 2027 All-Out Fallfest 10K?

The forecast calls for a high of 80°F and a low of 51°F with a 2% chance of rain. Check our detailed hourly forecast above for the best 10K race plan.

Historical Weather

Based on 12 years of data

Avg Temp

58°F

L:54° H:61°

RunScore

Conditions

Rain Freq

0 of 12 yrs

Wind3mph

Dew42°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 All-Out Fallfest 10K Partly cloudy throughout the day with rain. 2026	59°/67°	-	51°
2025 All-Out Fallfest 10K Becoming cloudy in the afternoon with late afternoon rain. 2025	56°/64°	-	46°
2024 All-Out Fallfest 10K Clear conditions throughout the day. 2024	59°/66°	-	40°
2023 All-Out Fallfest 10K Clear conditions throughout the day. 2023	50°/56°	-	40°
2022 All-Out Fallfest 10K Partly cloudy throughout the day. 2022	56°/63°	-	48°
2021 All-Out Fallfest 10K Clear conditions throughout the day. 2021	53°/61°	-	41°
2020 All-Out Fallfest 10K Partly cloudy throughout the day. 2020	60°/68°	-	42°
2019 All-Out Fallfest 10K Becoming cloudy in the afternoon. 2019	58°/65°	-	31°
2018 All-Out Fallfest 10K Clear conditions throughout the day. 2018	54°/62°	-	39°
2017 All-Out Fallfest 10K Partly cloudy throughout the day with rain. 2017	48°/50°	-	42°
2016 All-Out Fallfest 10K Partly cloudy throughout the day. 2016	45°/50°	-	37°
2015 All-Out Fallfest 10K Clear conditions throughout the day. 2015	53°/59°	-	45°

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