Thousand Islands Half Marathon, 10K & 5K
About this race
Take in the famous views of the Thousand Islands and Thousand Islands bridge. Once again, we will be offering the 5K on Friday evening at the Thousand Islands Winery in Alexandria Bay. On Saturday, we will offer the 10K and Half Marathon on Wellesley Island along with the post-race festivities and awards ceremony. If you are feeling ambitious, you are more than welcome to consider the Island Double (5K & 10K) or the Island Super Double (5K & 13.1M). This event is part The Get Fit Half Marathon Series.
For 2026 we are returning to the Lake Course Executive Club House (21496 Club House Dr.) for the start/finish for Saturdays Half Marathon & 10K similar to years 2020-2023 & 2025.
Great views, great courses...always best swag plus we get to help the great people of Alexandria Bay as well as the ACS Booster Club!
Pick your distance
Running
Thousand Islands 5K
***Please note that the 5K will be held on Friday only*** The 5K is a road course that will be held at the Thousand Islands Winery, 43298 Seaway Ave, Alexandria Bay, NY 13607.
Island Super Double (5K & 13.1)
***Please note that the 5K will be held on Friday-May 15, 2026 with the start/finish at the Thousand Islands Winery, 43298 Seaway Ave, Alexandria Bay, NY 13607. Start time is 5:00pm The Half Marathon will be held on Saturday morning-May 16, 2026 on Wellesley Island with a start time of 8:00am
Island Double (5K & 10K)
***Please note that the 5K will be held on Friday-May 15, 2026 with the start/finish at the Thousand Islands Winery, 43298 Seaway Ave, Alexandria Bay, NY 13607. Start time is 5:00pm The 10K will be held on Saturday morning-May 16, 2026 on Wellesley Island with a start time of 8:30am
Thousand Islands 5K (Virtual)
Thousand Islands 5K Virtual can be run anytime between May 1 and May 31, 2026. Simply go to the race website and submit your time. Please email us at willowrunningNY@gmail.com when completed. Your packet will be mailed out one week ahead of the race.
Thousand Islands Half Marathon
A beautiful road course that will take you under the 1000 Islands Bridge and along the St Lawrence seaway!
Thousand Islands 10K
Thousand Islands Half Marathon (Virtual)
Thousand Islands Half Marathon Virtual can be run anytime between May 1 and May 31, 2026. Simply go to the race website and submit your time. Please email us at willowrunningNY@gmail.com when completed. Your packet will be mailed out one week ahead of the race.
Thousand Islands 10K (Virtual)
Thousand Islands 10K Virtual can be run anytime between May 1 and May 31, 2026. Simply go to the race website and submit your time. Please email us at willowrunningNY@gmail.com when completed. Your packet will be mailed out one week ahead of the race.
Course
Route map and elevation profile
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
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Results — Thousand Islands Half Marathon, 10K & 5K
Other races near Wellesley Island
Different organizers, within 40 miles, in the next three months
Medal for the Red Kettle
Sackets Harbor Marathon & Half Marathon
St. Lawrence Federal Credit Union 5K Walk/Run
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 1 Wellesley Island event
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