When to plant tomato in Boise
Tomato is frost-tender, so every date keys off Boise's last spring frost of May 2.
Step 1 · Sow
Start seeds indoors
Apr 3 – Apr 24
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 24 – Jun 14
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 23 – Aug 17
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Boise's 168-day season leaves this much room.
Tomato on Boise'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
MAY 2
OCT 17
Common questions
When will tomato be ready to harvest in Boise?
Expect to harvest from around late July (Jul 23–Aug 17) in Boise, based on its local frost dates. Confidence 80%.
When should I start tomato seeds indoors in Boise?
Start seeds indoors around early April (Apr 3–Apr 24) in Boise, based on its local frost dates. Confidence 85%.
When can I transplant tomato outdoors in Boise?
Transplant outdoors around late May (May 24–Jun 14) in Boise, based on its local frost dates. Confidence 86%.
How long is the growing season in Boise?
Boise has roughly 168 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 Boise's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.