When to plant broccoli in Lyon
Broccoli is cold-hardy, so every date keys off Lyon's frost dates of Apr 15.
Step 1 · Sow
Start seeds indoors
Mar 4 – Mar 25
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 1 – Apr 22
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 31 – Jun 25
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Lyon's 193-day season leaves this much room.
Broccoli 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 broccoli be ready to harvest in Lyon?
Expect to harvest from around late May (May 31–Jun 25) in Lyon, based on its local frost dates. Confidence 77%.
When should I start broccoli seeds indoors in Lyon?
Start seeds indoors around early March (Mar 4–Mar 25) in Lyon, based on its local frost dates. Confidence 82%.
When can I transplant broccoli outdoors in Lyon?
Transplant outdoors around early April (Apr 1–Apr 22) 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 broccoli to maturity outdoors.
The rule of thumb
Sow broccoli 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 Lyon's frost dates.
Confidence 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.