Half Marathons in Connecticut 2026 | Upcoming Races & Dates

Lake Terramuggus Sprint Triathlon #4

Thu, Jul 30 · Marlborough, CT Marlborough

Super Sprint TriAqua BikeSprint Relay Tri +1

From $35 Open Closing Soon

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Newtown Community Running Event

Sun, Aug 30 · Newtown, CT Newtown

5K Run/Walk10K1/2 Marathon

From $35 Open

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Be Happy Road Race

Sun, Aug 30 · Ellington, CT Ellington

Kid Fun Run 1K - LIVE IN PERSONVirtual 5K Run5K RUN/WALK - LIVE IN PERSON +3

From $20 Open 2 spots left

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Faxon Law New Haven Road Race

Mon, Sep 7 · New Haven, CT New Haven

1/2 Mile Kids Fun Run5KHalf Marathon +4

From $8 Open

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2026 Dave Parcells Madison Triathlon

Sat, Sep 12 · Madison, CT Madison

AquabikeYouth "Try" (Ages 11-16 with adult)Individual Sprint Tri +5

From $100 Open

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Sickle Cell Disease Association of America, CT/ Michelle's House Walk. Run. Bike.

Sat, Sep 26 · New Haven, CT New Haven

Sickle Cell Disease Association of America, CT/ Mile Walk - Michelle's HouseSickle Cell Disease Association of America, CT/ James Barber 5K Run - Michelle's HouseSickle Cell Disease Association of America, CT Bike Ride - Michelle's House

From $25 Open

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Hogsback Half Marathon

Sat, Sep 26 · Colebrook, CT Colebrook

Half Marathon

From $60 Open

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HSS Greenwich Half Marathon

Sun, Sep 27 · Old Greenwich, CT Old Greenwich

Half Marathon

From $70 Open

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Iron Hike - Fall Kuwohi Trail Half Marathon Plus Relay - 15 Miles | 7,140' Elevation | 12-Hour | Run, Hike or Walk

Sat, Oct 3 · Cornwall, CT Cornwall

Kuwohi - 15 Miles | 7,140' Elevation | 12-Hour

From $0 Closed

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Iron Hike - Fall Kuwohi Trail Half Marathon Plus - 15 Miles | 7,140' Elevation | 12-Hour | Run, Hike or Walk

Sat, Oct 3 · Cornwall, CT Cornwall

Kuwohi - 15 Miles | 7,140' Elevation | 12-Hour

From $0 Closed

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Garavel SoNo Half Marathon | 5K

Sun, Oct 4 · Norwalk, CT Norwalk

5K Student5KHalf Marathon Student +1

From $25 Open 10 spots left

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The Ridgefield Road Fest 50th Anniversary: 1/2 Marathon, 7-Miler, and Iris Fund 5K

Sun, Oct 18 · Ridgefield, CT Ridgefield

Iris Fund 5KIris Fund Team Only-5KRidgefield Road Fest 7-miler +3

From $23.5 Open

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Reservoir Run Half Marathon, 5K, Kids Fun Runs & Family Stroll

Sun, Oct 25 · WESTON, CT WESTON

Reservoir Run - Kids Fun Runs & Family Stroll (all ages)Reservoir Run 5KReservoir Run Races Half Marathon

From $15 Open

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Hillacious Half Marathon

Sat, Nov 14 · Litchfield, CT Litchfield

Hillacious Half 4 mile walk and runHillacious Half RelayHillacious Half Marathon

From $50 Closed

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Half Marathons in Connecticut — 2026

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