Castle to River Run
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Castle to River Run - October 25, 2026
The Castle to River Run in Garrison, NY includes a half marathon, a 5K and a 3/4-mile kids fun run. The event is a fundraiser for The Friends of Philipstown Recreation, a 501c3 organization that supports recreation programs and facilities in Cold Spring, Garrison, Nelsonville and Continental Village, NY. The race course travels through Hudson Highlands State Park and down to the Hudson River, and passes the historic Osborn Castle with special permission for race-day access.
Access to the Castle and Forest Farm Road property is restricted to registered runners during the race; spectators are not allowed on those sections. Runners must remain on the Castle driveway while on private property. Training runs should follow posted signs and avoid the Castle property and Forest Farm Road.
Distances
- 1/2 Marathon through Hudson Highlands State Park, passes Osborn Castle
- 5K following part of Benedict Arnold's escape path to the Hudson River and back
- Kids 3/4-mile fun run on the recreation center grounds; race-day sign-up; $5
The half marathon course mixes single track, double track, dirt roads and some paved sections, with mostly runnable terrain and some technical stretches and hills. One aid station serves half marathon runners and is passed twice at mile 5.5 and mile 8 offering water, sports drink and light snacks; there is no aid station on the 5K. The race starts and finishes at the Philipstown Recreation Department at 107 Glenclyffe Drive. All entrants receive a race t-shirt; signing up by October 4 guarantees a shirt in the requested size. Registration fees vary by date and the event does not issue refunds unless the organizers cancel the race. Visit the organization's website for the most recent information.
