When to plant spinach in Anchorage
Spinach is cold-hardy, so every date keys off Anchorage's frost dates of Apr 30.
Step 1 · Sow
Direct sow outdoors
Apr 27 – May 18
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Jun 6 – Jun 16
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Jul 17 – Jul 31
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Sep 2 – Sep 12
Maturity window for the second sowing.
Window
Days to maturity
40 – 50 d
Anchorage's 148-day season leaves this much room.
Spinach on Anchorage'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 30
SEP 26
Common questions
When can I sow spinach outdoors in Anchorage?
Direct-sow around late April (Apr 27–May 18) in Anchorage, based on its local frost dates. Confidence 82%.
When will spinach be ready to harvest in Anchorage?
Expect to harvest from around early June (Jun 6–Jun 16) in Anchorage, based on its local frost dates. Confidence 76%.
Can I plant spinach in autumn in Anchorage?
Yes — Anchorage supports a second, autumn sowing of spinach around mid July (Jul 17–Jul 31), timed to mature before the first fall frost.
How long is the growing season in Anchorage?
Anchorage has roughly 148 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 Anchorage's frost dates.
Confidence 85/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.