When to plant onions in Connecticut

Onions
Plant out in Bridgeport
Feb 22–Mar 15

Across Connecticut the window opens between February 22 and March 27. Find your city below; the dates follow each town's own average last frost.

Start indoors, Bridgeport
Jan 11–Feb 8
Plant out, Bridgeport
Feb 22–Mar 15
Last frost, Bridgeport
Apr 5

Start seeds indoors 8–12 weeks before the last frost; plant out 3–6 weeks before the last frost. Northern gardens need long-day varieties and southern gardens need short-day ones. A wrong pick gives small bulbs.

Onions planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
BridgeportFeb 22–Mar 15
StamfordMar 6–Mar 27
New HavenMar 6–Mar 27
HartfordMar 6–Mar 27
WaterburyMar 15–Apr 5
NorwalkMar 6–Mar 27
DanburyMar 20–Apr 10
New BritainMar 6–Mar 27
West HartfordMar 6–Mar 27
BristolMar 14–Apr 4
MeridenMar 15–Apr 5
West HavenMar 6–Mar 27
MilfordFeb 22–Mar 15
East HartfordMar 6–Mar 27
MiddletownMar 15–Apr 5
SheltonMar 14–Apr 4
NorwichMar 3–Mar 24
ManchesterMar 6–Mar 27
TorringtonMar 27–Apr 17
NaugatuckMar 7–Mar 28
NewingtonMar 6–Mar 27
New LondonMar 5–Mar 26
East HavenMar 6–Mar 27
WethersfieldMar 6–Mar 27
North HavenMar 7–Mar 28

Questions

When should I plant onions in Connecticut?

In Bridgeport, plant out from February 22 to March 15. Across Connecticut the window opens between February 22 and March 27, depending on the local last frost.

How is this date worked out?

Start seeds indoors 8–12 weeks before the last frost; plant out 3–6 weeks before the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Connecticut

Onions in other states

Frost dates for every city in Connecticut