When to Plant Basil
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GardenSays
Start basil seeds indoors Mar 31 – Apr 14; transplant once frost danger is past and soil has warmed to ~70°F — typically May 12 – May 19 here.
- Start seeds indoors
- Mar 31 – Apr 14
- Transplant outside
- May 12 – May 19
- Last frost (typ.)
- May 5
In Minneapolis, MN, the typical last frost lands around May 5. Working back 4-6 weeks from transplant time gives you a seed-starting window of Mar 31 – Apr 14 indoors. Basil plants are very frost-tender, so wait for two conditions — frost danger past AND soil around 70°F — which here typically means May 12-May 19.
- This year's transplant window (May 12 – May 19) has passed — dates shown are for planning next season.
Do this this week
- 1.Passed for this season — plan next spring: start seeds indoors ~Mar 31 – Apr 14, transplant ~May 12 – May 19
Calculated result · 3 verified sources · Checked 2026-07-15 · How we decide
Why
That leaves roughly 139 days of growing season before the typical first fall frost (Oct 5) — enough for most varieties. In a short-season area, favor early-maturing varieties (check the days-to-maturity on the tag).
- Frost kills tender seedlings outright, and cold soil stunts them even without frost — both dates matter.
- The 50% frost date is a planning midpoint: a late frost is still possible, so keep covers handy for the first two weeks.
When this doesn't apply
- Season extenders (row covers, walls of water, cold frames) let you plant 2-3 weeks earlier than these windows.
- Frost dates are area averages — low spots and valley floors run colder than the local average.
How this was calculated
- 1. Last spring frostMay 5Source guidance
Minneapolis, MN: typical (50% probability) last 32°F frost
- 2. Seed starting windowMar 31 – Apr 14Calculated result
Basil: start indoors 4-6 weeks before your typical transplant date
- 3. Transplant windowMay 12 – May 19Calculated result
Basil is very frost-tender: go out 7-14 days after the last frost, once soil reaches 70°F
- 4. First fall frostOct 5Source guidance
Minneapolis, MN: typical first 32°F frost in fall — the season's endpoint
Data sources
- University of Minnesota Extension — Growing basil in home gardens — Basil is extremely cold-sensitive: transplant only after frost danger with warm soil and nights; even light chill damages leaves. (checked 2026-07-15)
- NOAA NCEI — 1991-2020 U.S. Climate Normals (freeze date probabilities) (checked 2026-07-15)
- National Gardening Association — frost date lookup (checked 2026-07-15)
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