Register Online!

"If you want a fair, but fast course, usually perfect weather, great organization for aid stations, parking and getting to the start, and a chance for a marathon personal best, look no further. The Clarence DeMar Marathon is a terrific experience! Very cold at the start, shaded for the first 17 miles and somewhat shaded in spots thereafter, with a longish, gentle uphill at 15 and a couple of short, steep hills in the cemetery, around mile 23. Lots of downhills too. Beautiful scenery, nice shirt, and a nice medal. You are missing out on America's best kept marathon secret, if you haven't run this one." - review

2nd Annual Kids' Demar Marathon

Run 25 miles through the summer, the finish your last 1.2 miles on the last 1.2 miles of the Demar Marathon Course! Click on the image for more info

See the 2013 Results

Check out the past years' results and winners list here. quote.....

"Very nice course during the first half, with mostly downhill running in the shade. The out-and-back by the dam was very nice. The spectators and volunteers were great."

This is the Official website of the 37th Demar Race Weekend.

PLEASE NOTE! On-line registration will close on Wednesday, 9/24 at 12:00pm. We will have registration open at runner check in Friday and Saturday, as well as race day registration.

Super Seniors Marathon

Our first year of the Super Seniors Marathon was a huge success….and we plan to make it even better. Click here to download the map and details!

Half Marathon Details

New for 2014, The Demar Race Weekend is adding a certified 13.1 course. The start of the 1/2 marathon to be in the Surry Mt Dam Recreation area located off of Rt 12A in Surry NH. New this year! The DeMar Half Marathon. Same day and start time (September 28th,...

About Clarence DeMar

What do you do after a doctor tells you that you shouldn’t run marathons? ¬† Win Boston 7 times. ¬†This is why Clarence DeMar is arguably the best marathoner that ever lived….

Kids’ Marathon

Run 25 miles through the summer, then on September 28th, you run the last 1.2 miles through the official DeMar Marathon/ Half Marathon finish line.

Review the Courses

This is a great small marathon. Many fast runners in attendance but a slower runner like myself was welcomed and treated superbly. Beautiful course along a bubbling brook, across a historic stone bridge and trees with fall foliage. Excellent medal and well fitting shirt. Easy logistics for packet pickup, bag...


We need you! If you like having fun, have a positive and enthusiastic attitude, we would love to have you join our Clarence DeMar team for race day, Sunday September 28th, 2014. All volunteers get the coveted Clarence DeMar Volunteer shirt.

Keene, New Hampshire | September 28th | 8am

We appreciate the support of our sponsors....