When to plant sweet potato in New Haven
Sweet potato is frost-tender, so every date keys off New Haven's last spring frost of Apr 19.
Step 1 · Plant
Transplant outdoors
Jun 9 – Jun 30
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Sep 7 – Oct 7
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
New Haven's 184-day season leaves this much room.
Sweet potato 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 will sweet potato be ready to harvest in New Haven?
Expect to harvest from around early September (Sep 7–Oct 7) in New Haven, based on its local frost dates. Confidence 75%.
When can I transplant sweet potato outdoors in New Haven?
Transplant outdoors around early June (Jun 9–Jun 30) 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 sweet potato to maturity outdoors.
The rule of thumb
Sow sweet potato 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.