When to plant Basil in Zone 1a
In Zone 1a, Basil: start seeds indoors around May 4–May 18; transplant outdoors around Jun 22–Jul 6. Expect to harvest around Aug 21–Sep 4.
| Step | When |
|---|---|
| Start seeds indoors | May 4 – May 18 |
| Transplant outdoors | Jun 22 – Jul 6 |
| Harvest | Aug 21 – Sep 4 |
Tip: Extremely frost-sensitive. Keep indoors until nights are reliably warm, then pinch often.
Zone 1a averages a last spring frost around Jun 15 and a first fall frost around Aug 15. These are zone averages — look up your ZIP for your exact area.
See the full Zone 1a calendar in the tool →