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Great Island 5K

location_on

New Castle, New Hampshire, United States

calendar_today 11 Oct, 2026

directions_run Running

sell $10.00 – $40.00

About the Event

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!

Races Offered

5K Race Walk

Oct 11, 2026

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Distance — 5K

terrain

Type — Running

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10:00

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$40.00

5K Run and Walk

Oct 11, 2026

straighten

Distance — 5K

terrain

Type — Running

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10:00

sell

$40.00

Kids Fun Run

Oct 11, 2026

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Distance — Kids Fun Run

terrain

Type — Running

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11:15

sell

$10.00

Weather Overview

These values represent the 3-year monthly averages for October in New Castle.

Temp (°C)

Feels Like (°C)

thermostat 9.0° / 17.0°

wb_sunny 6.0° / 14.5°

Wind (km/h)

Humidity (%)

air 12.0 /

water_drop 74.2%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 9.0° / 17.0°

wb_sunny 6.0° / 14.5°

air 12.0 km/h

water_drop 74.2%

About New Castle

Learn more about the host city, New Castle.

New Castle is a town in Rockingham County, New Hampshire, United States. The population was 1,000 at the 2020 census. It is the easternmost town in New Hampshire and the smallest by area, and it is the only town in the state located entirely on islands. It is home to Fort Constitution Historic Site, Fort Stark Historic Site, and the New Castle Common, a 31-acre (13 ha) recreation area on the Atlantic Ocean. New Castle is also home to a United States Coast Guard station, as well as the historic Wentworth by the Sea hotel.