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Triathlon Calendar near Marlboro 2026-2027

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Explore the top triathlons near Marlboro for 2026-2027! We've gathered 2 exciting races in the area. Check out our detailed list below to find your next local race.

September 2026
Sep
19
Sa

Blue Hills Adventure Race

Multisport Blue Hills Adventure Race 38 15 12 mi
One-day, USARA-sanctioned adventure race in the Connecticut River Valley combining biking, trekking and a roughly 12 mile paddle on September 19, 2026.
October 2026
Oct
3
Sa

The Great River Challenge

Cross Triathlon Short Course 4 2.5 3.75 mi Full distance 5.5 4 7.5 mi
An off road triathlon at Northfield Mountain with a mass start paddle on the Connecticut River, followed by trail run and single track mountain bike legs.
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