When to plant sweet potato in Lyon
Sweet potato is frost-tender, so every date keys off Lyon's last spring frost of Apr 15.
Step 1 · Plant
Transplant outdoors
May 6 – May 27
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Aug 4 – Sep 3
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Lyon's 193-day season leaves this much room.
Sweet potato on Lyon'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 15
OCT 25
Common questions
When will sweet potato be ready to harvest in Lyon?
Expect to harvest from around early August (Aug 4–Sep 3) in Lyon, based on its local frost dates. Confidence 77%.
When can I transplant sweet potato outdoors in Lyon?
Transplant outdoors around early May (May 6–May 27) in Lyon, based on its local frost dates. Confidence 86%.
How long is the growing season in Lyon?
Lyon has roughly 193 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 Lyon's frost dates.
Confidence 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.