When should I plant spinach in ZIP 43215?

In ZIP 43215, the main spinach target is around Apr 2, based on the representative Columbus frost station and USDA zone 6b.

When should I start spinach seeds indoors in 43215?

Spinach is usually direct-sown for ZIP 43215. Use the Apr 2 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 43215 planting calendar

When to plant spinach in Columbus, OH - Zone 6b

Q: When is the first frost in Columbus?

Columbus (ZIP 43215) has an average first fall frost around Oct 15, leaving about 168 frost-free days.

In ZIP 43215, plant spinach around Apr 2; this uses the Columbus frost station, USDA zone 6b, and spinach timing rules.

Your Columbus calendar has a 168-day estimated frost-free season. This estimate uses the representative Columbus frost station, USDA zone 6b, and spinach timing rules.

Source: columbus-port-columbus frost station, USDA zone 6b, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

Reviewed by GrowZone Editorial. Calculated from the columbus-port-columbus frost station and USDA zone 6b, last updated 2026-06-28.

In the Columbus area, spinach timing follows the Columbus frost window, so the local ZIP date can differ from a broad zone-only calendar.

USDA zone 6b Columbus frost station Ohio State University Extension Updated 2026-06-28

Read the method

Answer first

When to start spinach seeds indoors in Columbus

In ZIP 43215, spinach is usually direct-sown around Apr 2 instead of started indoors.

Spinach is normally direct-sown in Columbus. Use around Apr 2 as the outdoor planting window for ZIP 43215.

Seed starting schedule

Spinach dates for Columbus, OH

Step	Date	How to use it
Direct Sow	April 2, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Columbus?

Columbus (ZIP 43215) has an average last spring frost around Apr 30.

First frost

When is the first frost in Columbus?

The average first fall frost is around Oct 15, giving about 168 frost-free days.

Season map

Spinach windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Apr 2

Harvest

May 17

Frost watch

Aug 31

Reminder workflow

Every date has a next action

Direct sow spinachApr 2

Last frost windowApr 30

First spinach harvest windowMay 17

Last spinach sowing targetAug 31

Signal	Value	Why it matters
Last frost estimate	April 30, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	October 15, 2026	Fall planting counts backward from this date.
Season length	168 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

Columbus frost history and USDA zone 6b shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

Ohio State University 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 Oct 15. A conservative last sowing target is around Aug 31.