When to plant spinach in New Haven
Spinach is cold-hardy, so every date keys off New Haven's frost dates of Apr 19.
Step 1 · Sow
Direct sow outdoors
Apr 1 – Apr 22
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 11 – May 21
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Aug 9 – Aug 23
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Sep 25 – Oct 5
Maturity window for the second sowing.
Window
Days to maturity
40 – 50 d
New Haven's 184-day season leaves this much room.
Spinach 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 spinach outdoors in New Haven?
Direct-sow around early April (Apr 1–Apr 22) in New Haven, based on its local frost dates. Confidence 81%.
When will spinach be ready to harvest in New Haven?
Expect to harvest from around mid May (May 11–May 21) in New Haven, based on its local frost dates. Confidence 75%.
Can I plant spinach in autumn in New Haven?
Yes — New Haven supports a second, autumn sowing of spinach around early August (Aug 9–Aug 23), timed to mature before the first fall frost.
How long is the growing season in New Haven?
New Haven has roughly 184 frost-free days, which is enough time to grow spinach to maturity outdoors.
The rule of thumb
Sow spinach as soon as the soil is workable — it tolerates cool weather and light frost. 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.