5 running, swimming, triathlon, and other events in Southington, Connecticut

From big races to Saturday morning group runs—find running, swimming, triathlon, and ultra events and connect with the local endurance sports community.

• Spring Fling 600 [cttrailmixers.com] [Register at raceroster.com]
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  Sat, May 09, 2026 at 8:00 AM

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  Come join the CT Trailmixers for the eighth annual Spring Fling 600 trail races on Saturday, May 9 starting at 8:00 am ET at YMCA Camp Sloper in Southington, CT!

  This year we’re offering some new...

  Come join the CT Trailmixers for the eighth annual Spring Fling 600 trail races on Saturday, May 9 starting at 8:00 am ET at YMCA Camp Sloper in Southington, CT!

  This year we’re offering some new race options in addition to the classic 600-minute race. Accompanying the Fling 600 we now offer a 6 Mile distance race, while hardened Fling races can step up to become Fling Fanatics by entering both the Fall Fling and Spring Fling.

  Entry Options

  Spring Fling 600

  Run as many loops as you’d like of a roughly three-mile trail course within 600 minutes (10 hours).

  Spring Fling 6 Mile

  Complete 2 laps of the roughly three-mile course.

  Fling Fanatic Series

  Do the double - Spring Fling 600 and Fall Fling 400!

  CT Trailmixers take pride in welcoming folks who are new to trail running! This event is a great opportunity to give it a try. We make it fun, with a well-marked course that offers a great variety of terrain and scenery. And you’ll get plenty of cheers and high-fives throughout the day — along with what some past participants have said is the best aid station spread they’ve ever seen.

  Run Trail

  950 East Street, Southington, Connecticut, 06489, United States
  OpenStreetMap Google Maps
• Race4Chase Triathlon Program FINALE Race: Connecticut [runsignup.com]
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  Sat, Aug 01, 2026 at 7:15 AM

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  For 6 weeks, young athletes across Rhode Island and Massachusetts have been swimming, biking, and running toward this one incredible goal!

  This finale event brings together participants from...

  For 6 weeks, young athletes across Rhode Island and Massachusetts have been swimming, biking, and running toward this one incredible goal!

  This finale event brings together participants from Race4Chase programs across both states to celebrate their hard work, determination, and confidence gained throughout the summer. It’s more than a race, it’s a powerful celebration of youth achievement, healthy living, and community support.

  While this event is exclusively for Race4Chase participants and not open to public registration, we need enthusiastic volunteers to help make it a safe, smooth, and unforgettable experience for every child crossing that finish line.

  Run Swim Triathlon

  1000 East Street, Southington, Connecticut, 06489, United States
  OpenStreetMap Google Maps
• Fall Fling 400 [cttrailmixers.com] [Register at raceroster.com]
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  Sat, Nov 21, 2026 at 8:00 AM

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  Welcome!

  Come join the CT Trailmixers for the annual Fall Fling 400 trail races! This year we’re again offering race entry options. These races are a great opportunity to give trail running a try....

  Welcome!

  Come join the CT Trailmixers for the annual Fall Fling 400 trail races! This year we’re again offering race entry options. These races are a great opportunity to give trail running a try.

  Entry Options

  Fall Fling 400 You can run as many loops as you’d like of a roughly two-mile trail course as long as you're done within 400 minutes (six hours 40 minutes). You’re not required to run an ultra distance — at least 28 miles (or 14 loops) — although many people will. Whether you want to try your first trail race, or go for an ultra distance, this event is for you.

  Spring Fling 4 Miler Complete 2 laps of the roughly two-mile course.

  Fling Fanatic Series Do the double - Spring Fling 600 and Fall Fling 400!

  We aim to make trail running fun, with a well-marked course that offers a great variety of terrain and scenery. And you’ll get plenty of cheers and high-fives throughout the day — along with what some past participants have said is the best aid station spread they’ve ever seen.

  Run Trail Ultra

  950 East Street, Southington, Connecticut, 06489, United States
  OpenStreetMap Google Maps

Local Clubs & Organizations