Great Island 5K
Great Island 5K is a running race on October 11, 2026 in New Castle, NH, with entry fees from $10 to $40.
- Date
- October 11, 2026 (80 days to go)
- Price
- $10–$40
- Sport
- Running
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
City 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.
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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 an accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Coming Up
More Running races near New Castle, NH
Sabine Strong 3.3 & Kids Dash
1 Mile · 5K · From $10 · Newington Old Town Hall
4 miles away
LIVE Saunders at Rye Harbor 10K
10K · From $45 · 211 Central Rd
5 miles away
Seacoast Cancer 5K Run/Walk
1 Mile · 5K · From $30 · 67 Corporate Drive
4 miles away
18th Annual Celebrate Pink 5K Run & Walk
5K · From $30 · Portsmouth Middle School
4 miles away
Plan your trip
Make it a Racecation
Coming from out of town? There's more to New Castle than race day. We'll help you line up nearby lodging, flights, a rental car, and things to do so you can make the most of your racecation.
Plan your trip to New CastleFrequently Asked Questions (FAQs)
What is the Great Island 5K?+
When and where is the Great Island 5K?+
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Great Island 5K
Oct 11, 2026