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 Registration

When registering, provide an accurate predicted finish time—this determines your starting wave position. To run with friends, use the same unique time (like 45:27) based on your group's slowest runner.

Number pickup occurs Friday evening (5:30-9:00 p.m.) or race morning (6:30-8:00 a.m.) at William J. Brosnan School. Numbers aren't assigned until three days before the race.

Don't Miss Out!

This race sells out annually due to its reputation and community support. To participate in the largest running race on Long Island, register early and contact Great Cow Harbor 10K Run organizers at info@cowharborrace.com with questions.

Start your registration today—your spot in this incredible running community awaits!

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