When to Plant Tomatoes in Idaho
Idaho spans USDA hardiness 4a to 7b (zones 4a to 7b on this page). Plant tomatoes by your local frost date, not the calendar — pick your zone below for exact start-indoors, transplant, and harvest dates.
Jump to: Zone 4a · Zone 4b · Zone 5a · Zone 5b · Zone 6a · Zone 6b · Zone 7a · Zone 7b
Tomatoes planting calendar for Idaho, Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Start seeds indoors
Apr 3
Transplant outdoors
May 29
Projected first harvest
Aug 15
Most tomatoes mature in about 55 to 85 days depending on the variety. Full zone 4 guide (both 4a and 4b) →
Tomatoes planting calendar for Idaho, Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Start seeds indoors
Mar 29
Transplant outdoors
May 24
Projected first harvest
Aug 10
Most tomatoes mature in about 55 to 85 days depending on the variety. Full zone 4 guide (both 4a and 4b) →
Tomatoes planting calendar for Idaho, Zone 5a
Average last spring frost
May 5
Average first fall frost
October 1
Start seeds indoors
Mar 24
Transplant outdoors
May 19
Projected first harvest
Aug 5
Most tomatoes mature in about 55 to 85 days depending on the variety. Full zone 5 guide (both 5a and 5b) →
Tomatoes planting calendar for Idaho, Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Start seeds indoors
Mar 19
Transplant outdoors
May 14
Projected first harvest
Jul 31
Most tomatoes mature in about 55 to 85 days depending on the variety. Full zone 5 guide (both 5a and 5b) →
Tomatoes planting calendar for Idaho, Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Start seeds indoors
Mar 14
Transplant outdoors
May 9
Projected first harvest
Jul 26
Most tomatoes mature in about 55 to 85 days depending on the variety. Full zone 6 guide (both 6a and 6b) →
Tomatoes planting calendar for Idaho, Zone 6b
Average last spring frost
April 20
Average first fall frost
October 15
Start seeds indoors
Mar 9
Transplant outdoors
May 4
Projected first harvest
Jul 21
Most tomatoes mature in about 55 to 85 days depending on the variety. Full zone 6 guide (both 6a and 6b) →
Tomatoes planting calendar for Idaho, Zone 7a
Average last spring frost
April 15
Average first fall frost
October 20
Start seeds indoors
Mar 4
Transplant outdoors
Apr 29
Projected first harvest
Jul 16
Most tomatoes mature in about 55 to 85 days depending on the variety. Full zone 7 guide (both 7a and 7b) →
Tomatoes planting calendar for Idaho, Zone 7b
Average last spring frost
April 10
Average first fall frost
October 30
Start seeds indoors
Feb 27
Transplant outdoors
Apr 24
Projected first harvest
Jul 11
Most tomatoes mature in about 55 to 85 days depending on the variety. Full zone 7 guide (both 7a and 7b) →
Not sure which half-zone you're in? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
30 varieties of tomatoes in the HomeSown library. Tap any for its full grow guide.
Common problems with tomatoes
What to watch for, with identification and treatment for each
🌱 Grow tomatoes with a calendar built for your exact yard
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