2025 - The Great River Challenge, Off-road Triathlon
2025 distances
Triathlon
Solo Triathlon Male Long Course
A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 5.5 miles. The Running leg is a challenging 4 miles of single track trails and in the woods followed by a 7.5 mile mtn bike on single track trails.
Solo Triathlon Female Long Course
A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 5.5 miles. The Running leg is a challenging 4 miles of single track trails and in the woods followed by a 7.5 mile mtn bike on single track trails.
2 Person Relay Team Triathlon Long Course
Teams must sign up together. A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 5.5 miles. The Running leg is a challenging 4 miles of single track trails and in the woods followed by a 7.5 mile mtn bike single track trails.
2 Person Junior (20 & under) Triathlon Long Course
Teams must sign up together. A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 5.5 miles. The Running leg is a challenging 4 miles of single track trails and in the woods followed by a 7.5 mile mtn bike single track trails.
3 Person Relay Team Triathlon Long Course
Teams must sign up together. A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 5.5 miles. The Running leg is a challenging 4 miles of single track trails and in the woods followed by a 7.5 mile mtn bike single track trails.
4 Person Relay Team Triathlon Long Course
Teams must sign up together. A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 5.5 miles. The Running leg is a challenging 4 miles of single track trails and in the woods followed by a 7.5 mile mtn bike single track trails.
3 Woman Relay Team Triathlon Long Course
Teams must sign up together. A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 5.5 miles. The Running leg is a challenging 4 miles of single track trails and in the woods followed by a 7.5 mile mtn bike single track trails.
Solo Triathlon Male Short Course
A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 4 miles. The Running leg is a challenging 2.5 miles of single track trails and in the woods followed by a 3.75 mile mtn bike on single track trails.
Solo Triathlon Female Short Course
A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 4 miles. The Running leg is a challenging 2.5 miles of single track trails and in the woods followed by a 3.75 mile mtn bike on single track trails.
Solo Triathlon SUP Short Course
A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 4 miles. The Running leg is a challenging 2.5 miles of single track trails and in the woods followed by a 3.75 mile mtn bike on single track trails.
Solo Junior Triathlon Short Course
A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 4 miles. The Running leg is a challenging 2.5 miles of single track trails and in the woods followed by a 3.75 mile mtn bike on single track trails.
2 Person Relay Team Triathlon Short Course
Teams must sign up together. A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 4 miles. The Running leg is a challenging 2.5 miles of single track trails and in the woods followed by a 3.75 mile mtn bike on single track trails.
3 Person Relay Team Triathlon Short Course
Teams must sign up together. A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 4 miles. The Running leg is a challenging 2.5 miles of single track trails and in the woods followed by a 3.75 mile mtn bike on single track trails.
3 Person Junior (20 & under) Triathlon Short Course
Teams must sign up together. A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 4 miles. The Running leg is a challenging 2.5 miles of single track trails and in the woods followed by a 3.75 mile mtn bike on single track trails.
4 Grand Master 70+ Relay Team Triathlon Short Course
Teams must sign up together. A canoe/kayak/SUP, trail run and mountain bike triathlon, the Great River Challenge will offer a hilly off-road course on fun trails at the Northfield Mtn Environmental and Recreation Center. The paddle leg will be a mass start on the Connecticut river, paddling out and back and around Captain Kidd's Island over 4 miles. The Running leg is a challenging 2.5 miles of single track trails and in the woods followed by a 3.75 mile mtn bike on single track trails.
Race-day weather
Conditions on October 4, 2025 — historical Open-Meteo data.
The sun rises at 6:50 AM and sets at 6:25 PM local time (EDT) in Northfield on October 4, 2025 — 11h 34m of daylight.
Course
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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2025 results — The Great River Challenge, Off-road Triathlon
46 finishers across 11 distances · leading places in the Solo Triathlon Male Long Course
| Place | Name | Time | Pace |
|---|---|---|---|
| 1 | Trent Koopman | 1:59:06 | 7:13 /mi |
| 2 | Ernie Lozeau | 2:25:36 | 8:49 /mi |
| 3 | Ed Hofmeister | 2:33:29 | 9:18 /mi |
| 4 | Justin Lively | 2:33:34 | 9:18 /mi |
| 5 | Michael McCarthy | 2:50:15 | 10:19 /mi |
Every finisher is on the results page, filterable by distance, gender and age group.
Other races near Northfield
Different organizers, within 40 miles, in the next three months
The Great River Challenge, Off-road Triathlon
Mahar Cancer Fund Fun Run 5K
Orange Turkey Trot
Winston Prouty Foliage 5K and Little Leaf Dash
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 Northfield event
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