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Triathlon Calendar near Great Diamond Island 2025-2026

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

October 2025
Oct
4
Saturday

Bobcat Ridge 25k

Trail Run 25 km
Oct
5
Sunday

Maine Marathon

13 mi 26 mi
Oct
5
Sunday

Trust Trail Fest October

Trail Run 5 km 10 km
Oct
5
Sunday

Little Duck 50k

Trail Run 10 km 50 km
Oct
12
Sunday

Beach and Road 10K

10 km
Oct
19
Sunday

Fair Election 5K

5 km
Oct
19
Sunday

Runnin' Monks Road Race

5 km
Oct
25
Saturday

Thorne Head Trail Run

Trail Run 4 km
Oct
26
Sunday

Big Brad Ultras

Trail Run 25 km 50 km 50 mi
November 2025
Nov
1
Saturday

Holistic Hustle

Trail Run 5 km 10 km
Nov
9
Sunday

Kick Out Mesothelioma 5-Miler In Memory of John W. Griffin

2 mi 5 mi
December 2025
Dec
6
Saturday

Ugly Sweater 5K

5 km
Dec
20
Saturday

Seaside Santa Dash

5 km 10 km
January 2026
Jan
18
Sunday

Jimmy the Greek's Frozen 4-Miler

4 mi
April 2026
Apr
11
Saturday

Falmouth 4-Miler

4 mi
Apr
26
Sunday

Dash for Dogs 5k

5 km
May 2026
May
2
Saturday

Dash for the Derby

5 km
May
16
Saturday

Boots and Brews 5K

5 km
June 2026
Jun
6
Saturday

Shipyard Old Port Half Marathon

5 km 13 mi
Jun
7
Sunday

Maine Running Hall of Fame 5K

5 km
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