Spaulding Woods 50K

Spaulding Woods 50K : Northfield, NH

The Spaulding Woods 50K is a trail ultramarathon held on the campus of Spaulding Academy & Family Services at 72 Spaulding Rd in Northfield, New Hampshire on July 11, 2026. The course uses the same landscape that supports year-round outdoor programming and outdoor education.

The race consists of five 10K loops on technical singletrack. The trail features rocks, roots, footbridges, and steady short climbs and descents. The looped format keeps runners near the start and finish area and provides a well-stocked aid station, a midpoint water station, portable toilets, and personal drop bags available at the end of each lap.

Runners have a ten hour time limit to complete the race and there is a strict eight hour cutoff to begin the fifth loop; runners who do not start the final loop within that cutoff will not be permitted to continue. Pacers are not allowed. This is a cupless event and participants are expected to carry their own refillable water containers. Animals including dogs, drones, strollers, and bikes are not permitted. The use of headphones is discouraged for safety.

The venue is described as easily accessible from I-93. Nearby accommodations listed include the Tilton Inn, Holiday Inn Express & Suites, and Hampton Inn & Suites. The event offers a structured cancellation and deferral policy: cancel by April 1 for a 100% deferral to the following year, cancel by June 1 for a 50% deferral, and after June 1 no deferrals or credits are available. Deferred entries apply only to the following year and cash refunds are not offered. Refund protection is available at checkout through UltraSignup. Visit the organization's website for the most recent information.