Clarence DeMar Marathon

USATF Certified

Sunday, September 27, 2026

Keene, New Hampshire

USATFCourse

Course Information

USATF Certified Course

NH25007JK · Expires 2035

Certified Course Name

2025 Clarence Demar Half Marathon

Net Drop

+0.52

m/km

Separation

45.0%

start to finish

This course has a net uphill grade — expect a more challenging race.

View USATF Course Map (PDF)

Race Details

Race Day

Sunday, September 27, 2026

Course

Loop

Also Offers

26.2M

Registration

Race Website

Official race information

Historical Weather

☀

Avg High

68°F

☽

Avg Low

52°F

☂

Precip

0.12 in

🍃

Wind

8.7 mph

80% humidity·Based on 5-year historical data

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Course Information

USATF Certified Course

NH25007JK · Expires 2035

Certified Course Name

2025 Clarence Demar Half Marathon

Net Drop

+0.52

m/km

Separation

45.0%

start to finish

This course has a net uphill grade — expect a more challenging race.

View USATF Course Map (PDF)

Race Details

Race Day

Sunday, September 27, 2026

Course

Loop

Also Offers

26.2M

Registration

Race Website

Official race information