Clarence DeMar Marathon

KeeneNew HampshireUnited States

Next race

Sunday, 26 September 2027

7:00 am start

Distance

42.195 km / 26.2 mi

Scenic road

Elevation

Net downhill · 215 m gain

215 m climbing

Race profile

Overview

The Clarence DeMar Marathon draws approximately 308 finishers each September on a scenic road in Keene, United States. The Clarence DeMar Marathon honors a six-time Boston champion on a USATF-certified course through the Monadnock Region. The course passes Surry Mountain Dam, Bretwood Golf Course, and historic Keene neighborhoods during peak foliage season. Rolling terrain with moderate climbs shapes the middle miles.

Clarence DeMar Marathon is a certified 42.195 km (26.2 mile) marathon — the standard World Athletics marathon distance.

Typical participants: Approximately 308 finishers

Weather: Warm and humid autumn
17–23°C · humidity 70–80%
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Course & terrain

Clarence DeMar Marathon course

Course route details and elevation profile for race-week planning.

The Clarence DeMar Marathon is a rolling scenic road course with moderate climbs. Starts in Gilsum and finishes on Appian Way at Keene State College. The course passes Surry Mountain Dam, Bretwood Golf Course, and historic Keene neighborhoods during peak foliage season. Rolling terrain with moderate climbs.

Registration

Clarence DeMar Marathon entry requirements

Clarence DeMar Marathon is typically held in September. Registration opens through https://clarencedemar.com/ and may use a lottery or tiered entry when demand exceeds capacity.

Common questions

Frequently Asked Questions

What is the Clarence DeMar Marathon elevation profile?: The Clarence DeMar Marathon has 215 metres of total climbing and 346 metres of descent over 42.195 km (26.2 miles). The course is net downhill, with 131 metres of net descent from start to finish.
How long is the Clarence DeMar Marathon?: The Clarence DeMar Marathon is the standard marathon distance of 42.195 kilometres (26.2 miles), certified to World Athletics rules. The Clarence DeMar Marathon is a scenic road through Keene.
What time does the Clarence DeMar Marathon start?: The 2027 Clarence DeMar Marathon starts at 7:00 am local time on Sunday, 26 September 2027. Arrive early for baggage drop and corral access — official race communications confirm any last-minute schedule changes.
Where does the Clarence DeMar Marathon start and finish?: Starts in Gilsum and finishes on Appian Way at Keene State College. Updated each year.
When is the Clarence DeMar Marathon and how do I register?: Clarence DeMar Marathon is typically held in September. Registration opens may use a lottery or tiered entry when demand exceeds capacity.
Is the Clarence DeMar Marathon course flat?: No — the course has a net elevation drop from Gilsum to Keene with rolling hills along the way (about 215 m gain and 346 m loss per FindMyMarathon). The official race description notes a net downhill profile with a long climb around mile 15 and steeper rollers in the final miles. Study the course profile at before setting pace targets.
What landmarks does the Clarence DeMar Marathon pass?: The route runs from Gilsum through Surry Mountain Dam into historic Keene and Keene State College.
What weather should runners expect at Clarence DeMar Marathon?: Cool September mornings with early New England foliage and comfortable racing temperatures.

Last updated 11 October 2026. Edition dates and course details are reviewed regularly.

Close to this race

Nearby Marathons

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FairleeVermontUnited States· 109 km away

Maple Leaf Marathon

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World Marathon Major

BostonMassachusettsUnited States· 118 km away

Boston Marathon

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Next race: Monday, 19 April 2027

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Planning guides

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Clarence DeMar Marathon

Overview

Clarence DeMar Marathon course

Clarence DeMar Marathon entry requirements

Clarence DeMar Marathon travel

Frequently Asked Questions

Clarence DeMar Marathon links

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