When to plant onion in Kyoto
Onion is cold-hardy, so every date keys off Kyoto's frost dates of Apr 10.
Step 1 · Sow
Start seeds indoors
Jan 30 – Feb 20
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 16 – May 7
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 15 – Aug 4
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
Kyoto's 230-day season leaves this much room.
Onion on Kyoto'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 10
NOV 25
Common questions
When will onion be ready to harvest in Kyoto?
Expect to harvest from around mid July (Jul 15–Aug 4) in Kyoto, based on its local frost dates. Confidence 40%.
When should I start onion seeds indoors in Kyoto?
Start seeds indoors around late January (Jan 30–Feb 20) in Kyoto, based on its local frost dates. Confidence 43%.
When can I transplant onion outdoors in Kyoto?
Transplant outdoors around mid April (Apr 16–May 7) in Kyoto, based on its local frost dates. Confidence 44%.
How long is the growing season in Kyoto?
Kyoto has roughly 230 frost-free days, which is enough time to grow onion to maturity outdoors.
The rule of thumb
Sow onion 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 Kyoto's frost dates.
Confidence 45/100 · Curated · based on NASA POWER (modeled) 1991–2020 · frost dates are probabilities, not guarantees.