Your Essential Guide to Registering for the Great Cow Harbor 10K Run (Before It Sells Out!)
Your Essential Guide to Registering for the Great Cow Harbor 10K Run (Before It Sells Out!) The Great Cow Harbor 10K Run stands as Long Island's largest running race, drawing thousands of participants each September. This premier event consistently sells out, making early registration essential for serious runners. So, before you contact Great Cow Harbor 10k Run to learn how to be part of the largest running race on Long Island , you need to read this guide! Key Registration Info Registration opens March 20th through the official Website . The race has a cap of 5,000 entries and closes when this limit is reached—no exceptions. Important Dates: Race Day: Saturday, September 20th, 2025, at 8:30 a.m. Online Registration Deadline: September 14th at 9:00 p.m. Paper Applications: Must be Postmarked by September 5th Pricing Tiers: $44.15 (March 20 - May 1) $49.33 (May 2 - September 5) $54.50 (September 6-15, If Available) $64.85 (September 16-20, If Available) Tips for a Smooth Registrati...