The 2023 event has concluded.

Boulderthon Marathon

Boulder, CO, USA • October 08, 2023
TopDescriptionCourseCommunity
Register

Subscribe

Get updates on the Boulderthon 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.

clear-day Clear conditions throughout the day.

Vegan, reef friendly sunscreen. Protect yourself and the environment. Sun Bum Sun Care.When you buy through our links, we may earn a commission.

Area Map

Course Maps

FAQ

Ask a Question about the Boulderthon Marathon

Racecast Concierge (free during beta)

Ask a question about the Boulderthon 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 Boulderthon Marathon and general racecast.io updates.

When is the 2023 Boulderthon Marathon?

The 2023 Boulderthon Marathon will be held on Sunday October 8, 2023.

Is the Boulderthon Marathon a Boston Marathon Qualfier?

Yes, the Boulderthon Marathon is an official Boston Marathon qualifier.

What is the time limit for the Boulderthon Marathon?

The time limit for the Boulderthon Marathon is 6.5 hours.

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

RunScore
Run Score: 8
Temp
71°F
Min/Max
45°/71°F
Dew
29°F
Days of Rain
0/3
Wind
4mph
Tap a row for details.
YearLow / HighRain

Boulderthon Marathon 2023 Weather History

Clear conditions throughout the day.

2023
clear-day
46°/ 77°-
Run Score: 8

Boulderthon Marathon 2022 Weather History

Clear conditions throughout the day.

2022
clear-day
43°/ 72°-
Run Score: 8

Boulderthon Marathon 2021 Weather History

Clear conditions throughout the day.

2021
clear-day
45°/ 66°-
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