When to plant broccoli in Lyon
Broccoli is cold-hardy, so every date keys off Lyon's frost dates of Mar 26.
Step 1 · Sow
Start seeds indoors
Feb 12 – Mar 5
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 12 – Apr 2
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 11 – Jun 5
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Aug 2 – Aug 16
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Oct 8 – Nov 2
Maturity window for the second sowing.
Window
Days to maturity
60 – 85 d
Lyon's 232-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
MAR 26
NOV 16
Common questions
When will broccoli be ready to harvest in Lyon?
Expect to harvest from around mid May (May 11–Jun 5) in Lyon, based on its local frost dates. Confidence 78%.
When should I start broccoli seeds indoors in Lyon?
Start seeds indoors around mid February (Feb 12–Mar 5) in Lyon, based on its local frost dates. Confidence 83%.
When can I transplant broccoli outdoors in Lyon?
Transplant outdoors around mid March (Mar 12–Apr 2) in Lyon, based on its local frost dates. Confidence 87%.
Can I plant broccoli in autumn in Lyon?
Yes — Lyon supports a second, autumn sowing of broccoli around early August (Aug 2–Aug 16), timed to mature before the first fall frost.
How long is the growing season in Lyon?
Lyon has roughly 232 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 87/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.