Question 1

When should I plant basil in ZIP 43215?

Accepted Answer

In ZIP 43215, the main basil target is around May 10, based on the representative Columbus frost station and USDA zone 6b.

Question 2

When should I start basil seeds indoors in 43215?

Accepted Answer

Start basil seeds indoors in ZIP 43215 around Mar 26, about 35 days before the Apr 30 last-frost estimate.

Question 3

When is the last frost in Columbus?

Accepted Answer

Columbus (ZIP 43215) has an average last spring frost around Apr 30, based on the representative Columbus frost station.

Question 4

When is the first frost in Columbus?

Accepted Answer

Columbus (ZIP 43215) has an average first fall frost around Oct 15, leaving about 168 frost-free days.

Question 5

Is this a guaranteed planting date?

Accepted Answer

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

Step	Date	How to use it
Start Indoors	March 26, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	May 10, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	May 10, 2026	Sow seed outside when the crop and soil can handle the window.

Start basil seeds indoors around Mar 26

Basil dates for Columbus, OH