Great Island 5K
- Date
- October 11, 2026
- Distance
- 5K Run and Walk · 5K Race Walk · Kids Fun Run
From the Organizer
Our 5K is held on one of the most beautiful courses in New England. It starts and finishes at the Great Island Common at the mouth of the Piscataqua River. The course runs through the scenic and historic roads of New Castle NH. We have the largest free raffle in New England, great food and a high quality race hat to the first 700 registered. We also offer 3 kids fun runs and a new playground to entertain the whole family
All proceeds of the GI5K go to Charity.
We hope you can join us for the 32nd Great Island 5K!
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
62°
Typical Low
42°
Chance of Rain
33%
Based on US Climate Normals data from Greenland, 6 mi from the venue.
Host City
About New Castle, NH
Elevation
15 ft
Nearest Airport
PSM
Portsmouth International Airport at Pease · 5 mi
Major Hub
PWM
Portland International Jetport · 45 mi
Time Zone
Eastern Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Great Island 5K, put it on the calendar, and turn “someday” into a start date.
Coming Up
More Running races near New Castle, NH
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the Great Island 5K?
- Great Island 5K is a running race held in New Castle, New Hampshire on October 11, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the Great Island 5K?
- Sunday, October 11, 2026 in New Castle, New Hampshire at 265 Wentworth Road, New Castle, NH. Check the event page for exact start times and wave schedules.
- How do I register for the Great Island 5K?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
Great Island 5K
Oct 11, 2026