All-Out Fallfest Half Marathon

Westminster, CO, USA • September 13, 2025
TopDescriptionCourseCommunity
Register

Subscribe

Get updates on the All-Out Fallfest Half Marathon race forecast and be the first to know if the forecast shifts.

Text Updates

Maximum one update per day. Standard messaging rates apply. Currently only supports USA, UK, and Canada.

Phone Number

Email Updates

By submitting your email you agree to receive weather forecasts and racecast.io updates.

partly-cloudy-day Partly cloudy throughout the day.

Our favorite marathon tested handheld water bottle. Nathan SpeedDraw Plus Insulated Flask.When you buy through our links, we may earn a commission.

Area Map

Course Maps

FAQ

Ask a Question about the All-Out Fallfest Half Marathon

Racecast Concierge (free during beta)

Ask a question about the All-Out Fallfest Half Marathon and we'll do the hard part and find the answer for you within 48 hours.

By using Racecast Concierge, you agree to receive email alerts pertaining to the All-Out Fallfest Half Marathon and general racecast.io updates.

When is the 2025 All-Out Fallfest Half Marathon?

The 2025 All-Out Fallfest Half Marathon will be held on Saturday September 13, 2025.

Community

You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR

Historical Weather & Results

RunScore
Run Score: 8
Temp
78°F
Min/Max
54°/78°F
Dew
33°F
Days of Rain
1/8
Wind
5mph
Tap a row for details.
YearLow / HighRain

All-Out Fallfest Half Marathon 2024 Weather History

Clear conditions throughout the day.

2024
clear-day
59°/ 87°-
Run Score: 8

All-Out Fallfest Half Marathon 2022 Weather History

Partly cloudy throughout the day with afternoon rain.

2022
clear-day
55°/ 76°-
Run Score: 8

All-Out Fallfest Half Marathon 2021 Weather History

Clear conditions throughout the day.

2021
clear-day
51°/ 88°-
Run Score: 7

All-Out Fallfest Half Marathon 2020 Weather History

Clear conditions throughout the day.

2020
clear-day
58°/ 83°-
Run Score: 8

All-Out Fallfest Half Marathon 2019 Weather History

Becoming cloudy in the afternoon.

2019
clear-day
56°/ 75°-
Run Score: 8

All-Out Fallfest Half Marathon 2018 Weather History

Clear conditions throughout the day.

2018
clear-day
53°/ 85°-
Run Score: 8

All-Out Fallfest Half Marathon 2017 Weather History

Partly cloudy throughout the day with rain.

2017
cloudy
48°/ 52°Light
Run Score: 9

All-Out Fallfest Half Marathon 2015 Weather History

Clear conditions throughout the day.

2015
clear-day
52°/ 81°-
Run Score: 8
You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR
You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR