The 2025 event has concluded.

Clarence DeMar Marathon

Keene, NH, USA • September 28, 2025
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clear-day Clear conditions throughout the day.

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When is the 2025 Clarence DeMar Marathon?

The 2025 Clarence DeMar Marathon will be held on Sunday September 28, 2025.

Is the Clarence DeMar Marathon a Boston Marathon Qualfier?

Yes, the Clarence DeMar Marathon is an official Boston Marathon qualifier.

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The Clarence DeMar Marathon was held on September 24, 2023.

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News

Sunday's race in Keene, N.H., is named after a New England resident who was one of the best distance runners of the early 20th century. He played a role in redefining our relationship to exercise.

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Historical Weather & Results

RunScore
Run Score: 8
Temp
68°F
Min/Max
50°/69°F
Dew
51°F
Days of Rain
2/16
Wind
7mph
Tap a row for details.
YearLow / HighRain

Clarence DeMar Marathon 2024 Weather History

Partly cloudy throughout the day.

2024
cloudy
57°/ 66°-
Run Score: 8

Clarence DeMar Marathon 2023 Weather History

Cloudy skies throughout the day with rain.

2023
cloudy
52°/ 63°-
Run Score: 9

Clarence DeMar Marathon 2022 Weather History

Partly cloudy throughout the day with late afternoon rain.

2022
partly-cloudy-day
40°/ 64°-
Run Score: 7

Clarence DeMar Marathon 2021 Weather History

Partly cloudy throughout the day.

2021
partly-cloudy-day
53°/ 68°-
Run Score: 8

Clarence DeMar Marathon 2019 Weather History

Clearing in the afternoon.

2019
partly-cloudy-day
61°/ 66°-
Run Score: 8

Clarence DeMar Marathon 2018 Weather History

Partly cloudy throughout the day with morning rain.

2018
rain
42°/ 62°Light
Run Score: 8

Clarence DeMar Marathon 2017 Weather History

Clear conditions throughout the day.

2017
clear-day
55°/ 92°-
Run Score: 7

Clarence DeMar Marathon 2016 Weather History

Clearing in the afternoon.

2016
fog
36°/ 61°-
Run Score: 7

Clarence DeMar Marathon 2015 Weather History

Clearing in the afternoon.

2015
fog
34°/ 66°-
Run Score: 8

Clarence DeMar Marathon 2014 Weather History

Clearing in the afternoon.

2014
fog
54°/ 81°-
Run Score: 8

Clarence DeMar Marathon 2013 Weather History

Partly cloudy throughout the day.

2013
fog
44°/ 69°-
Run Score: 8

Clarence DeMar Marathon 2012 Weather History

Partly cloudy throughout the day with late afternoon rain.

2012
cloudy
54°/ 59°-
Run Score: 9

Clarence DeMar Marathon 2011 Weather History

Partly cloudy throughout the day.

2011
fog
64°/ 75°-
Run Score: 8

Clarence DeMar Marathon 2010 Weather History

Partly cloudy throughout the day.

2010
cloudy
49°/ 70°-
Run Score: 8

Clarence DeMar Marathon 2009 Weather History

Cloudy skies throughout the day with a chance of rain throughout the day.

2009
rain
50°/ 63°Light
Run Score: 7

Clarence DeMar Marathon 2008 Weather History

Cloudy skies throughout the day with rain.

2008
cloudy
63°/ 72°-
Run Score: 8
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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:

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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