Question 1

When should I plant lettuce in ZIP 80012?

Accepted Answer

In ZIP 80012, the main lettuce target is around Apr 21, based on the representative Denver frost station and USDA zone 6a.

Question 2

When should I start lettuce seeds indoors in 80012?

Accepted Answer

Start lettuce seeds indoors in ZIP 80012 around Apr 7, about 28 days before the May 5 last-frost estimate.

Question 3

When is the last frost in Aurora?

Accepted Answer

Aurora (ZIP 80012) has an average last spring frost around May 5, based on the representative Denver frost station.

Question 4

When is the first frost in Aurora?

Accepted Answer

Aurora (ZIP 80012) has an average first fall frost around Oct 5, leaving about 153 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 7, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	April 21, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	April 21, 2026	Sow seed outside when the crop and soil can handle the window.

Start lettuce seeds indoors around Apr 7

Lettuce dates for Aurora, CO