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Triathlon Calendar near Chelmsford 2025-2026

Explore the top triathlons near Chelmsford for 2025-2026! We've gathered 44 exciting races in the area. Check out our detailed list below to find your next local race.

May 2025
May
4
Sunday

Groton Road Race

5 km 10 km
May
4
Sunday

Run Like a Maverick

5 km
May
4
Sunday

Gator Gallop 5K

5 km
May
10
Saturday

Tarc Wapack and Back

Trail Run 21 mi 43 mi 50 mi
May
10
Saturday

Run. Walk. United for Mental Health 5K

5 km
May
10
Saturday

Stride Along the Tide 5K

5 km
May
10
Saturday

Boston Marine Corps Honor Run

5 km
May
10
Saturday

Saint Catherine of Siena School 5K

5 km
May
11
Sunday

Melrose Run For Women

3 mi
May
11
Sunday

Moms' Run - Somerville

5 km
May
11
Sunday

Strong As A Mother 5K

5 km
May
17
Saturday

Barns & Blooms Half Marathon

13 mi
May
17
Saturday

Thrive Stride 5k

5 km
May
17
Saturday

Dash For Dane & Family Day

Trail Run 5 km
May
18
Sunday

Harpoon 5-Miler

5 mi
May
18
Sunday

New England Season Opener

Triathlon
May
18
Sunday

Great Bear Run

5 km
May
18
Sunday

Trav's Trail Run

Trail Run 2 mi 3 mi
May
18
Sunday

Arlington Education Foundation 5K

5 km
May
18
Sunday

Mystic River Herring Run and Paddle

5 km 9 mi 12 mi
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