When should I plant spinach in ZIP 77002?

In ZIP 77002, the main spinach target is around Jan 23, based on the representative Houston frost station and USDA zone 9b.

When should I start spinach seeds indoors in 77002?

Spinach is usually direct-sown for ZIP 77002. Use the Jan 23 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 77002 planting calendar

When to plant spinach in Houston, TX - Zone 9b

Q: When is the first frost in Houston?

Houston (ZIP 77002) has an average first fall frost around Dec 5, leaving about 288 frost-free days.

In ZIP 77002, plant spinach around Jan 23; this uses the Houston frost station, USDA zone 9b, and spinach timing rules.

Your Houston calendar has a 288-day estimated frost-free season. This estimate uses the representative Houston frost station, USDA zone 9b, and spinach timing rules.

Source: houston-hobby frost station, USDA zone 9b, 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 9b Houston frost station Texas A&M AgriLife Extension Updated 2026-06-28

Read the method

Answer first

When to start spinach seeds indoors in Houston

In ZIP 77002, spinach is usually direct-sown around Jan 23 instead of started indoors.

Spinach is normally direct-sown in Houston. Use around Jan 23 as the outdoor planting window for ZIP 77002.

Seed starting schedule

Spinach dates for Houston, TX

Step	Date	How to use it
Direct Sow	January 23, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Houston?

Houston (ZIP 77002) has an average last spring frost around Feb 20.

First frost

When is the first frost in Houston?

The average first fall frost is around Dec 5, giving about 288 frost-free days.

Season map

Spinach windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Jan 23

Harvest

Mar 9

Frost watch

Oct 21

Reminder workflow

Every date has a next action

Direct sow spinachJan 23

Last frost windowFeb 20

First spinach harvest windowMar 9

Last spinach sowing targetOct 21

Signal	Value	Why it matters
Last frost estimate	February 20, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	December 5, 2026	Fall planting counts backward from this date.
Season length	288 days	Longer seasons can support succession crops.
Spacing	4-6 in	Airflow and root space affect yield.
Soil temperature	40 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Houston frost history and USDA zone 9b shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

Texas A&M AgriLife 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

Spinach timing notes

Plant early and again in late summer for fall leaves. Spinach prefers sun to part shade, 4-6 in spacing, and soil near 40 F+.

For fall, count backward from Dec 5. A conservative last sowing target is around Oct 21.