When to plant cucumber in New Haven
Cucumber is frost-tender, so every date keys off New Haven's last spring frost of Apr 19.
Step 1 · Sow
Start seeds indoors
Apr 20 – May 11
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jun 2 – Jun 23
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 22 – Aug 11
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 70 d
New Haven's 184-day season leaves this much room.
Cucumber on New Haven's growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
FROST
FROST
APR 19
OCT 19
Common questions
When can I sow cucumber outdoors in New Haven?
Direct-sow around early June (Jun 2–Jun 23) in New Haven, based on its local frost dates. Confidence 81%.
When will cucumber be ready to harvest in New Haven?
Expect to harvest from around late July (Jul 22–Aug 11) in New Haven, based on its local frost dates. Confidence 75%.
When should I start cucumber seeds indoors in New Haven?
Start seeds indoors around mid April (Apr 20–May 11) in New Haven, based on its local frost dates. Confidence 79%.
When can I transplant cucumber outdoors in New Haven?
Transplant outdoors around early June (Jun 2–Jun 23) in New Haven, based on its local frost dates. Confidence 81%.
How long is the growing season in New Haven?
New Haven has roughly 184 frost-free days, which is enough time to grow cucumber to maturity outdoors.
The rule of thumb
Sow cucumber 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. Every date on this page is derived from that rule and New Haven's frost dates.
Confidence 83/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.