Spofford Lake 10K

Spofford Lake 10K is run in Chesterfield, New Hampshire, on October 25, 2026. There is one distance, a 10K, and it starts at 9:00 a.m. by Spofford Lake in the southwestern corner of the state, late enough in the morning that you can travel in on the day.

Ten kilometers asks for a different kind of preparation than a 5K: you need a base of comfortable aerobic mileage plus some work at threshold pace, tempo runs of twenty to thirty minutes, to hold a steady effort for the full distance. Six to eight weeks of that is a reasonable build. If you are aiming at a personal best, resist the temptation to attack the first mile and let the effort rise gradually through the second half.