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Races in Connecticut
51 Events
Endurance Races in Connecticut
Trehko tracks 51 endurance events in Connecticut, including 50 Running events, 1 Triathlon event. Whether you're searching for your first 5K, a Boston qualifier marathon, a local triathlon, or a trail ultra, Connecticut has a race for every athlete. Use Trehko to compare registration fees and deadlines side by side, save your target races, and get automated reminders before registration opens or closes. All races listed below link directly to their official registration pages.
All 51 Races in Connecticut
15th Annual Milford 5K Trick or Trot Run/Walk — Milford, 5K 2026 Dave Parcells Madison Triathlon — Madison, Sprint Tri 5K for Ballet! — East Hampton, 5K Apple Harvest Road Races — Southington, Road Race Arc Run — Meriden, 10K Bound for the Sound — Old Lyme, 5K Brookfield Lions Run for Sight 4-Miler — Brookfield, Road Race Cider Mill Road Race — Tolland, 5K Come Out & Run 5k — Wilton, 5K East Windsor Veterans Day 5K Road Race — Broad Brook, 5K Eversource Hartford Marathon, Half Marathon, Relay & Charity 5K — Hartford, Half Marathon Faxon Law New Haven Road Race — New Haven, Half Marathon Forbidden Forest 30 Hour Ultra — Stratford, Ultra Garavel SoNo Half Marathon | 5K — Norwalk, Half Marathon Greenwich Half Marathon — Old Greenwich, Half Marathon Hartford Marathon — Hartford, Marathon Hillacious Half Marathon — Litchfield, Half Marathon HKYFS Pumpkin Run 5K, 2M & Kids Run — Higganum, 5K Hogsback Half Marathon — Colebrook, Half Marathon Iron Hike - Fall Answer the Bell Ultra Trail Marathon - Basic (Backyard Ultra Format) - 28+ Miles | 14,400'+ Elevation | 24-Hour | Run, Hike or Walk — Cornwall, Ultra Iron Hike - Fall Answer the Bell Ultra Trail Marathon - Full (Backyard Ultra Format) - 100+ Miles | 50,400' Elevation | 84-Hour | Run, Hike or Walk — Cornwall, Ultra Iron Hike - Fall Denali Ultra Trail Marathon - 43+ Miles | 20,825' Elevation | 48-Hour | Run, Hike or Walk — Cornwall, Ultra Iron Hike - Fall Denali Ultra Trail Marathon Relay - 43+ Miles | 20,825' Elevation | 48-Hour | Run, Hike or Walk — Cornwall, Ultra Iron Hike - Fall Double Kuwohi Trail Marathon Plus - 28+ Miles | 13,685' Elevation | 24-Hour | Run, Hike or Walk — Cornwall, Marathon Iron Hike - Fall Double Kuwohi Trail Marathon Plus Relay - 28+ Miles | 13,685' Elevation | 24-Hour | Run, Hike or Walk — Cornwall, Marathon Iron Hike - Fall Everest / 29029 Everesting Ultra Trail Marathon - 61+ Miles | 29,029'+ Elevation | 72-Hour | Run, Hike or Walk — Cornwall, Ultra Iron Hike - Fall Everest / 29029 Everesting Ultra Trail Marathon Relay - 61+ Miles | 29,029'+ Elevation | 72-Hour | Run, Hike or Walk — Cornwall, Ultra Iron Hike - Fall Kuwohi Trail Half Marathon Plus - 15 Miles | 7,140' Elevation | 12-Hour | Run, Hike or Walk — Cornwall, Half Marathon Iron Hike - Fall Kuwohi Trail Half Marathon Plus Relay - 15 Miles | 7,140' Elevation | 12-Hour | Run, Hike or Walk — Cornwall, Half Marathon Iron Hike - Fall Olympus Mons Ultra Trail Marathon - powered by Skratch Labs ® - 152+ Miles | 72,590' Elevation | 84-Hour | Run, Hike or Walk — Cornwall, Ultra Iron Hike - Fall Olympus Mons Ultra Trail Marathon Relay - powered by Skratch Labs ® - 152+ Miles | 72,590' Elevation | 84-Hour | Run, Hike or Walk — Cornwall, Ultra IronHike Mohawk Mountain Fall 2026 — Mohawk Mtn Ski Area, Cornwall, Road Race Marlborough Lions Club Round The Lake 5K — Marlborough, 5K Masquerade 5K — Marlborough, 5K Middlesex County Half Marathon — Middletown, Half Marathon Moonlight 5K — New Milford, 5K Murray Lender 5K Bagel Run — Woodbridge, 5K New Haven Road Race 20K — New Haven, 20K Newtown Turkey Trot — Newtown, 5K No Sto Defeats MSA 5K and Fitness Walk — North Stonington, 5K Riva Runs The Boardwalk 5k — West Haven, 5K Roxbury Fall Classic — Roxbury, Half Marathon St. Michael School 5K Turkey Trot — Pawcatuck, 5K Stamford Run Club 5k/10k/Half Marathon 2026 — Stamford, Half Marathon Storybook Half Marathon — Stratford, Half Marathon SUFFIELD PARKS & RECREATION ROAD RACE — Suffield, 10K Tackle the Trail (TM) — Northeast, Marathon The 36th edition of THE Great Pumpkin Classic — TRUMBULL, 5K The 39th Bigelow Tea Community Challenge — Southport, 5K The Ridgefield Road Fest 50th ANNIVERSARY: 1/2 Marathon, 7-Miler, & Iris Fund 5K — Ridgefield, Half Marathon Tunnel to Towers 5K Run & Walk - Bridgeport, CT — Bridgeport, 5K
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