When to plant tomato in San Bernardino
Tomato is frost-tender, so every date keys off San Bernardino's last spring frost of Feb 23.
Step 1 · Sow
Start seeds indoors
Feb 8 – Mar 1
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 10 – May 1
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 9 – Jul 4
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
San Bernardino's 284-day season leaves this much room.
Tomato on San Bernardino'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
FEB 23
DEC 9
Common questions
When will tomato be ready to harvest in San Bernardino?
Expect to harvest from around early June (Jun 9–Jul 4) in San Bernardino, based on its local frost dates. Confidence 70%.
When should I start tomato seeds indoors in San Bernardino?
Start seeds indoors around early February (Feb 8–Mar 1) in San Bernardino, based on its local frost dates. Confidence 74%.
When can I transplant tomato outdoors in San Bernardino?
Transplant outdoors around early April (Apr 10–May 1) in San Bernardino, based on its local frost dates. Confidence 76%.
How long is the growing season in San Bernardino?
San Bernardino has roughly 284 frost-free days, which is enough time to grow tomato to maturity outdoors.
The rule of thumb
Sow tomato 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 San Bernardino's frost dates.
Confidence 78/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.