Running Races in Marlborough, Connecticut 2026 | Browse All Races

There are 6 running races in Marlborough, Connecticut in 2026. The next is the Marlborough Lions Club Round The Lake 5K on May 24. Distances include 10K races, 5K races, marathons.

Marlborough Lions Club Round The Lake 5K

Sun, May 24 · Marlborough, CT Marlborough

Road 5k

From $30 Open

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 Relay 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 TriOlympic Relay Tri

From $85 Open

Running Races in Marlborough, Connecticut — 2026

Marlborough Lions Club Round The Lake 5K

Lake Terramuggus Sprint Triathlon #1

Lake Terramuggus Sprint Triathlon #2

Lake Terramuggus Sprint Triathlon #3

Lake Terramuggus Sprint Triathlon #4

Lake Terramuggus Olympic Triathlon

All Connecticut Races