Question 1

When should I plant lettuce in ZIP 85001?

Accepted Answer

In ZIP 85001, the main lettuce target is around Jan 22, based on the representative Phoenix frost station and USDA zone 10a.

Question 2

When should I start lettuce seeds indoors in 85001?

Accepted Answer

Start lettuce seeds indoors in ZIP 85001 around Jan 8, about 28 days before the Feb 5 last-frost estimate.

Question 3

When is the last frost in Phoenix?

Accepted Answer

Phoenix (ZIP 85001) has an average last spring frost around Feb 5, based on the representative Phoenix frost station.

Question 4

When is the first frost in Phoenix?

Accepted Answer

Phoenix (ZIP 85001) has an average first fall frost around Dec 15, leaving about 313 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	January 8, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	January 22, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	January 22, 2026	Sow seed outside when the crop and soil can handle the window.

Start lettuce seeds indoors around Jan 8

Lettuce dates for Phoenix, AZ