New York · 1/2 Marathon · 5K
Castle to River Run
Castle to River Run is a 1/2 Marathon and 5K event held in Garrison, New York. It was last held on October 25, 2026 and is usually run in October; the next date hasn't been announced yet.
- Usually held
- October
- Location
- Garrison, NY
Race details
- Last held
- October 25, 2026
- Usually held in
- October
- Location
- Garrison, New York
- Distances
- 1/2 Marathon, 5K
- Course
- Half Marathon 2,037 ft gain; 5K 308 ft gain, per official course page
- Registration
- ultrasignup.com
- Official website
- castletoriver.com
Registration, course & weather
- Registration status
- Registration status as last checked September 28, 2026: open
- Entry fee
- Listed fee for the longest distance, $55 (from ultrasignup.com, checked September 28, 2026)
- Start time
- 9:00 AM EDT
- Course profile — Half Marathon
- Out-and-back course; Mostly trail, some road; 2037 ft gain (official course data)
- Course profile — 5K
- Loop course; Mostly trail, some road; 308 ft gain (official course data)
- Typical race-day weather
- about 55°F at the start, 81% humidity, 7 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026)
About the Castle to River Run
The Castle to River Run is a Half Marathon and 5K trail race through Hudson Highlands State Park in Garrison, NY, benefiting Friends of Philipstown Recreation. The Half Marathon climbs past the historic Osborn Castle at Castle Rock before descending to the Hudson River, while the 5K follows part of Benedict Arnold's escape route on a flatter loop; a 1K kids costume run is also held on race day.
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Guides from the RaceRove blog
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- Blog All guides Planning advice for finding, choosing and travelling to races.
Castle to River Run: common questions
- When is the Castle to River Run?
- The next date hasn't been announced in the listing yet. The race is usually held in October. Check the organiser's website for the official date.
- Where is the Castle to River Run held?
- In Garrison, New York.
- What distances does the Castle to River Run offer?
- 1/2 Marathon and 5K.
- How do I register for the Castle to River Run?
- Registration is handled by the organiser at ultrasignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Castle to River Run?
- Registration status as last checked September 28, 2026: open. Listed fee for the longest distance, $55 (from ultrasignup.com, checked September 28, 2026).
- What time does the Castle to River Run start?
- 9:00 AM EDT.
- What is race-day weather usually like at the Castle to River Run?
- about 55°F at the start, 81% humidity, 7 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026).
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.