When to plant spinach in Milwaukee
Spinach is cold-hardy, so every date keys off Milwaukee's frost dates of Apr 23.
Step 1 · Sow
Direct sow outdoors
Apr 5 – Apr 26
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 15 – May 25
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Aug 13 – Aug 27
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Sep 29 – Oct 9
Maturity window for the second sowing.
Window
Days to maturity
40 – 50 d
Milwaukee's 182-day season leaves this much room.
Spinach on Milwaukee'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 23
OCT 23
Common questions
When can I sow spinach outdoors in Milwaukee?
Direct-sow around early April (Apr 5–Apr 26) in Milwaukee, based on its local frost dates. Confidence 86%.
When will spinach be ready to harvest in Milwaukee?
Expect to harvest from around mid May (May 15–May 25) in Milwaukee, based on its local frost dates. Confidence 80%.
Can I plant spinach in autumn in Milwaukee?
Yes — Milwaukee supports a second, autumn sowing of spinach around mid August (Aug 13–Aug 27), timed to mature before the first fall frost.
How long is the growing season in Milwaukee?
Milwaukee has roughly 182 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 Milwaukee's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.