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Connecticut Running Calendar 2026-2027

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Monthly updates for Connecticut

Get new running races (and updates) in your inbox every month.

Explore the best running races in Connecticut for 2026-2027! Our updated list features 135 exciting races across the region. Find your next race in Connecticut below and join the running community at these great events!

Half Marathons Marathons Trail Runs Triathlons
May 2026
May
3
Su

Edmund Ganem Memorial 5K Run/Walk

5 km
May
3
Su

The Blue 2 Blue Challenge

Trail Run 50 km
May
3
Su

Mount Archer Trail Race

Trail Run 3 mi 9 mi
May
9
Sa

CT Race in the Park

4 km 5 km
May
10
Su

WeCare-Mother's Day 5K

5 km
May
10
Su

Run Like a Mother 5k - Ridgefield

5 km
May
14
Th

Stamford Boys & Girls Club Corporate 5K

5 km
May
16
Sa

Forgotten Forest Ultra Run - Stratford, CT

Backyard Ultra 2 mi 9 hr
May
16
Sa

Run Ragged Last One Standing

Backyard Ultra 3 mi
May
16
Sa

Reservoir Rush

5 km
May
16
Sa

Dan the Man 5K Run/Walk for ALS

5 km
May
17
Su

Soapstone Mountain Trail Races

Trail Run 6 km Half Marathon
May
17
Su

Mystic Half Marathon

6 mi 13 mi
May
23
Sa

Hamden Hills Half Marathon & Flat 5K

5 km Half Marathon
May
24
Su

Mine Hill Half Marathon

Trail Run Half Marathon
May
25
Mo

Oh Boy 5K

5 km
May
30
Sa

Spring Street 5K

5 km
May
31
Su

TriRidgefield Sprint Triathlon

Triathlon
May
31
Su

Run the Vineyards - Jonathan Edwards 5K

5 km
June 2026
Jun
4-7
Th - Su

Ironhike Endurance Series - Spring

Trail Run 15 mi 28 mi ... 100 mi 152 mi