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When to plant basil

Basil timing, counted from your average last spring frost and first fall frost. Leaves blacken below about 40°F.

Seasonwarm-season, tender to frost
Start indoors6 weeks before to 4 weeks before the last frost
Transplant1 week after to 3 weeks after the last frost
Sow outdoors1 week after to 3 weeks after the last frost
Soil temperature to germinate60°F or warmer
Days to maturity60–90 days from seed
Spacing10–12 in apart, rows 18–24 in apart
Seed depth0.25 in
Glossy green leaves of a sweet basil plant
Photo: PumpkinSky, CC BY-SA 4.0, via Wikimedia Commons

Example dates

PlaceDates
Austin, TX (78701)Start seeds indoors: Jan 27–Feb 10; Transplant: Mar 17–31; Sow outdoors: Mar 17–31
Atlanta, GA (30303)Start seeds indoors: Feb 10–24; Transplant: Mar 31–Apr 14; Sow outdoors: Mar 31–Apr 14
St. Louis, MO (63101)Start seeds indoors: Feb 18–Mar 4; Transplant: Apr 8–22; Sow outdoors: Apr 8–22
Chicago, IL (60614)Start seeds indoors: Feb 27–Mar 13; Transplant: Apr 17–May 1; Sow outdoors: Apr 17–May 1
Denver, CO (80202)Start seeds indoors: Mar 19–Apr 2; Transplant: May 7–21; Sow outdoors: May 7–21
Seattle, WA (98101)Start seeds indoors: Jan 30–Feb 13; Transplant: Mar 20–Apr 3; Sow outdoors: Mar 20–Apr 3

Every ZIP page has its own dates. Find your ZIP.

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Sources

Summarized in our own words from public extension publications.

All vegetables · Your ZIP's planting calendar