Running Races in Marlborough, Connecticut 2026 | Browse All Races

There are 7 running races in Marlborough, Connecticut in 2026. The next is the Lake Terramuggus Sprint Triathlon #1 on June 18. Distances include 10K races, 5K races, marathons.

Lake Terramuggus Sprint Triathlon #1

Thu, Jun 18 · Marlborough, CT Marlborough

Triathlon Super Sprint TriAqua BikeSprint Relay Tri +1

From $35 Open

Lake Terramuggus Sprint Triathlon #2

Thu, Jul 2 · Marlborough, CT Marlborough

Triathlon Super Sprint TriAqua BikeSprint Tri +1

From $35 Open

Lake Terramuggus Sprint Triathlon #3

Thu, Jul 16 · Marlborough, CT Marlborough

Triathlon Sprint TriSuper Sprint TriSprint Relay Tri +1

From $35 Open

Lake Terramuggus Sprint Triathlon #4

Thu, Jul 30 · Marlborough, CT Marlborough

Triathlon Super Sprint TriAqua BikeSprint Tri +1

From $35 Open

Lake Terramuggus Olympic Triathlon

Sat, Aug 15 · Marlborough, CT Marlborough

Triathlon AquabikeOlympic Relay TriOlympic Tri

From $85 Open

Masquerade 5K

Sun, Oct 25 · Marlborough, CT Marlborough

Road Marlborough Masquerade 5k

From $25 Open

Marlborough Lions Club Round The Lake 5K

Sun, May 30 · Marlborough, CT Marlborough

Road 5k5k

From $25 Closed

Running Races in Marlborough, Connecticut — 2026

Lake Terramuggus Sprint Triathlon #1

Lake Terramuggus Sprint Triathlon #2

Lake Terramuggus Sprint Triathlon #3

Lake Terramuggus Sprint Triathlon #4

Lake Terramuggus Olympic Triathlon

Masquerade 5K

Marlborough Lions Club Round The Lake 5K

All Connecticut Races