When should I plant carrots in ZIP 85201?

In ZIP 85201, the main carrots target is around Jan 15, based on the representative Phoenix frost station and USDA zone 10a.

When should I start carrots seeds indoors in 85201?

Carrots is usually direct-sown for ZIP 85201. Use the Jan 15 planting window instead of starting it indoors.

Is this a guaranteed planting date?

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

ZIP 85201 planting calendar

When to plant carrots in Mesa, AZ - Zone 10a

Q: When is the first frost in Mesa?

Mesa (ZIP 85201) has an average first fall frost around Dec 15, leaving about 313 frost-free days.

In ZIP 85201, plant carrots around Jan 15; this uses the Phoenix frost station, USDA zone 10a, and carrots timing rules.

Your Phoenix calendar has a 313-day estimated frost-free season. This estimate uses the representative Phoenix frost station, USDA zone 10a, and carrots timing rules.

Source: phoenix-skyharbor frost station, USDA zone 10a, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

USDA zone 10a Phoenix frost station University of Arizona Extension Updated 2026-06-28

Read the method

Answer first

When to start carrots seeds indoors in Mesa

In ZIP 85201, carrots is usually direct-sown around Jan 15 instead of started indoors.

Carrots is normally direct-sown in Mesa. Use around Jan 15 as the outdoor planting window for ZIP 85201.

Seed starting schedule

Carrots dates for Mesa, AZ

Step	Date	How to use it
Direct Sow	January 15, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Mesa?

Mesa (ZIP 85201) has an average last spring frost around Feb 5.

First frost

When is the first frost in Mesa?

The average first fall frost is around Dec 15, giving about 313 frost-free days.

Season map

Carrots windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Jan 15

Harvest

Mar 26

Frost watch

Oct 6

Reminder workflow

Every date has a next action

Direct sow carrotsJan 15

Last frost windowFeb 5

First carrots harvest windowMar 26

Last carrots sowing targetOct 6

Signal	Value	Why it matters
Last frost estimate	February 5, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	December 15, 2026	Fall planting counts backward from this date.
Season length	313 days	Longer seasons can support succession crops.
Spacing	2-3 in	Airflow and root space affect yield.
Soil temperature	45 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Phoenix frost history and USDA zone 10a shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

University of Arizona Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Carrots timing notes

Direct sow only; carrots dislike transplanting. Carrots prefers full sun, 2-3 in spacing, and soil near 45 F+.

For fall, count backward from Dec 15. A conservative last sowing target is around Oct 6.