Long Course
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.
- Start Time:
- 10:00am EDT
- Price:
- $80.50 $72.55 incl. $5.05 Fee
- Registration:
- Price increases to $80.50 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $80.50 $72.55 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $80.50 |
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.
- Start Time:
- 10:00am EDT
- Price:
- $72.55 incl. $5.05 Fee
- Registration:
- Price increases to $80.50 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| March 12, 2026, 1:37pm EDT | July 29, 2026, 11:58pm EDT | $72.55 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $80.50 |
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.
- Start Time:
- 10:00am EDT
- Price:
- $122.90 $110.71 incl. $7.21 Fee
- Registration:
- Price increases to $122.90 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $122.90 $110.71 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $122.90 |
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.
Open to ages 20 and under.
- Start Time:
- 10:00am EDT
- Price:
- $94.28 $84.95 incl. $5.75 Fee
- Registration:
- Price increases to $94.28 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $94.28 $84.95 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $94.28 |
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.
- Start Time:
- 10:00am EDT
- Price:
- $191.80 $172.72 incl. $10.72 Fee
- Registration:
- Price increases to $191.80 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $191.80 $172.72 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $191.80 |
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.
- Start Time:
- 10:00am EDT
- Price:
- $234.20 $210.88 incl. $12.88 Fee
- Registration:
- Price increases to $234.20 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $234.20 $210.88 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $234.20 |
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.
- Start Time:
- 10:00am EDT
- Price:
- $191.80 $172.72 incl. $10.72 Fee
- Registration:
- Price increases to $191.80 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $191.80 $172.72 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $191.80 |
Short Course
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.
Open to ages 21+.
- Start Time:
- 10:00am EDT
- Price:
- $80.50 $72.55 incl. $5.05 Fee
- Registration:
- Price increases to $80.50 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $80.50 $72.55 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $80.50 |
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.
- Start Time:
- 10:00am EDT
- Price:
- $72.55 incl. $5.05 Fee
- Registration:
- Price increases to $80.50 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| March 12, 2026, 1:37pm EDT | July 29, 2026, 11:58pm EDT | $72.55 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $80.50 |
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.
- Start Time:
- 10:00am EDT
- Price:
- $80.50 $72.55 incl. $5.05 Fee
- Registration:
- Price increases to $80.50 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $80.50 $72.55 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $80.50 |
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.
Open to ages 20 and under.
- Start Time:
- 10:00am EDT
- Price:
- $59.30 $53.47 incl. $3.97 Fee
- Registration:
- Price increases to $59.30 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $59.30 $53.47 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $59.30 |
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.
- Start Time:
- 10:00am EDT
- Price:
- $122.90 $110.71 incl. $7.21 Fee
- Registration:
- Price increases to $122.90 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $122.90 $110.71 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $122.90 |
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.
- Start Time:
- 10:00am EDT
- Price:
- $191.80 $172.72 incl. $10.72 Fee
- Registration:
- Price increases to $191.80 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $191.80 $172.72 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $191.80 |
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.
Open to ages 20 and under.
- Start Time:
- 10:00am EDT
- Price:
- $140.92 $126.93 incl. $8.13 Fee
- Registration:
- Price increases to $140.92 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $140.92 $126.93 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $140.92 |
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.
Open to ages 70+.
- Start Time:
- 10:00am EDT
- Price:
- $234.20 $210.88 incl. $12.88 Fee
- Registration:
- Price increases to $234.20 after July 29, 2026 at 11:58pm EDT
| Registration Starting | Registration Ending | Price |
|---|---|---|
| February 24, 2026, 5:00am EST | July 29, 2026, 11:58pm EDT | $234.20 $210.88 |
| July 29, 2026, 11:59pm EDT | October 2, 2026, 8:00pm EDT | $234.20 |
This is a service fee for processing your registration. This may be slightly higher or lower per registrant than the amount shown here.
