When to plant sweet potato in Spokane
Sweet potato is frost-tender, so every date keys off Spokane's last spring frost of Apr 30.
Step 1 · Plant
Transplant outdoors
Jul 5 – Jul 26
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Oct 3 – Nov 2
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Spokane's 162-day season leaves this much room.
Sweet potato on Spokane'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
OCT 9
Common questions
When will sweet potato be ready to harvest in Spokane?
Expect to harvest from around early October (Oct 3–Nov 2) in Spokane, based on its local frost dates. Confidence 77%.
When can I transplant sweet potato outdoors in Spokane?
Transplant outdoors around early July (Jul 5–Jul 26) in Spokane, based on its local frost dates. Confidence 83%.
How long is the growing season in Spokane?
Spokane has roughly 162 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 Spokane's frost dates.
Confidence 86/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.