When to Plant Basil in Zone 3
In USDA zone 3a, start seeds indoors around April 18, transplant or plant outdoors June 13 to August 17, and expect your first harvest around August 17. (3a shown here — see 3a and 3b dates separately below.)
Basil planting calendar for USDA Zone 3a
Average last spring frost
May 30
Average first fall frost
September 10
Start seeds indoors
Apr 18
Transplant outdoors
Jun 13
Projected first harvest
Aug 17
Most basil mature in about 60 to 75 days depending on the variety, needing roughly 103 frost-free days in zone 3a.
Basil planting calendar for USDA Zone 3b
Average last spring frost
May 20
Average first fall frost
September 15
Start seeds indoors
Apr 8
Transplant outdoors
Jun 3
Projected first harvest
Aug 7
Most basil mature in about 60 to 75 days depending on the variety, needing roughly 118 frost-free days in zone 3b.
Not sure whether you're in 3a or 3b? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
7 varieties of basil in the HomeSown library. Tap any for its full grow guide.
Common problems with basil
What to watch for, with identification and treatment for each
🌱 Grow basil with a calendar built for your exact yard
HomeSown turns your ZIP code into a personalized planting calendar, watering reminders, and pest help. Free to start.
Start your free garden →