When to plant tomato in Bismarck
Tomato is frost-tender, so every date keys off Bismarck's last spring frost of May 15.
Step 1 · Sow
Start seeds indoors
Apr 16 – May 7
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jun 7 – Jun 28
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Aug 6 – Aug 31
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Bismarck's 132-day season leaves this much room.
Tomato on Bismarck'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 15
SEP 25
Common questions
When will tomato be ready to harvest in Bismarck?
Expect to harvest from around early August (Aug 6–Aug 31) in Bismarck, based on its local frost dates. Confidence 80%.
When should I start tomato seeds indoors in Bismarck?
Start seeds indoors around mid April (Apr 16–May 7) in Bismarck, based on its local frost dates. Confidence 85%.
When can I transplant tomato outdoors in Bismarck?
Transplant outdoors around early June (Jun 7–Jun 28) in Bismarck, based on its local frost dates. Confidence 86%.
How long is the growing season in Bismarck?
Bismarck has roughly 132 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 Bismarck's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.