Question 1

When should I plant basil in ZIP 80903?

Accepted Answer

In ZIP 80903, the main basil target is around May 25, based on the representative Colorado Springs frost station and USDA zone 6a.

Question 2

When should I start basil seeds indoors in 80903?

Accepted Answer

Start basil seeds indoors in ZIP 80903 around Apr 10, about 35 days before the May 15 last-frost estimate.

Question 3

When is the last frost in Colorado Springs?

Accepted Answer

Colorado Springs (ZIP 80903) has an average last spring frost around May 15, based on the representative Colorado Springs frost station.

Question 4

When is the first frost in Colorado Springs?

Accepted Answer

Colorado Springs (ZIP 80903) has an average first fall frost around Oct 1, leaving about 139 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	April 10, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	May 25, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	May 25, 2026	Sow seed outside when the crop and soil can handle the window.

Start basil seeds indoors around Apr 10

Basil dates for Colorado Springs, CO