When should I plant spinach in ZIP 33602?

In ZIP 33602, the main spinach target is around Jan 4, based on the representative Tampa frost station and USDA zone 10a.

When should I start spinach seeds indoors in 33602?

Spinach is usually direct-sown for ZIP 33602. Use the Jan 4 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 33602 planting calendar

When to plant spinach in Tampa, FL - Zone 10a

Q: When is the first frost in Tampa?

Tampa (ZIP 33602) has an average first fall frost around Dec 20, leaving about 322 frost-free days.

In ZIP 33602, plant spinach around Jan 4; this uses the Tampa frost station, USDA zone 10a, and spinach timing rules.

Your Tampa calendar has a 322-day estimated frost-free season. This estimate uses the representative Tampa frost station, USDA zone 10a, and spinach timing rules.

Source: tampa-intl 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 Tampa frost station University of Florida IFAS Extension Updated 2026-06-28

Read the method

Answer first

When to start spinach seeds indoors in Tampa

In ZIP 33602, spinach is usually direct-sown around Jan 4 instead of started indoors.

Spinach is normally direct-sown in Tampa. Use around Jan 4 as the outdoor planting window for ZIP 33602.

Seed starting schedule

Spinach dates for Tampa, FL

Step	Date	How to use it
Direct Sow	January 4, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Tampa?

Tampa (ZIP 33602) has an average last spring frost around Feb 1.

First frost

When is the first frost in Tampa?

The average first fall frost is around Dec 20, giving about 322 frost-free days.

Season map

Spinach windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Jan 4

Harvest

Feb 18

Frost watch

Nov 5

Reminder workflow

Every date has a next action

Direct sow spinachJan 4

Last frost windowFeb 1

First spinach harvest windowFeb 18

Last spinach sowing targetNov 5

Signal	Value	Why it matters
Last frost estimate	February 1, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	December 20, 2026	Fall planting counts backward from this date.
Season length	322 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

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

University of Florida IFAS 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 20. A conservative last sowing target is around Nov 5.