When to plant potato in Philadelphia
Potato is cold-hardy, so every date keys off Philadelphia's frost dates of Mar 28.
Step 1 · Sow
Direct sow outdoors
Mar 23 – Apr 13
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Jun 1 – Jul 21
Picking runs until conditions turn against the crop.
Window
Days to maturity
70 – 120 d
Philadelphia's 234-day season leaves this much room.
Potato on Philadelphia'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
HARVEST
MAR 28
NOV 22
Common questions
When can I sow potato outdoors in Philadelphia?
Direct-sow around late March (Mar 23–Apr 13) in Philadelphia, based on its local frost dates. Confidence 84%.
When will potato be ready to harvest in Philadelphia?
Expect to harvest from around early June (Jun 1–Jul 21) in Philadelphia, based on its local frost dates. Confidence 78%.
How long is the growing season in Philadelphia?
Philadelphia has roughly 234 frost-free days, which is enough time to grow potato to maturity outdoors.
The rule of thumb
Sow potato 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 Philadelphia's frost dates.
Confidence 87/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.