Question 1

When should I plant tomatoes in ZIP 85001?

Accepted Answer

In ZIP 85001, the main tomatoes target is around Feb 12, based on the representative Phoenix frost station and USDA zone 10a.

Question 2

When should I start tomatoes seeds indoors in 85001?

Accepted Answer

Start tomatoes seeds indoors in ZIP 85001 around Dec 25, about 42 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	December 25, 2025	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	February 12, 2026	Move hardened-off seedlings outside after the frost-risk window.

Start tomatoes seeds indoors around Dec 25

Tomatoes dates for Phoenix, AZ