When should I plant spinach in ZIP 73102?

In ZIP 73102, the main spinach target is around Mar 8, based on the representative Oklahoma City frost station and USDA zone 7b.

When should I start spinach seeds indoors in 73102?

Spinach is usually direct-sown for ZIP 73102. Use the Mar 8 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 73102 planting calendar

When to plant spinach in Oklahoma City, OK - Zone 7b

Q: When is the first frost in Oklahoma City?

Oklahoma City (ZIP 73102) has an average first fall frost around Oct 30, leaving about 208 frost-free days.

In ZIP 73102, plant spinach around Mar 8; this uses the Oklahoma City frost station, USDA zone 7b, and spinach timing rules.

Your Oklahoma City calendar has a 208-day estimated frost-free season. This estimate uses the representative Oklahoma City frost station, USDA zone 7b, and spinach timing rules.

Source: oklahoma-city-will-rogers frost station, USDA zone 7b, 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 7b Oklahoma City frost station Oklahoma State University Extension Updated 2026-06-28

Read the method

Answer first

When to start spinach seeds indoors in Oklahoma City

In ZIP 73102, spinach is usually direct-sown around Mar 8 instead of started indoors.

Spinach is normally direct-sown in Oklahoma City. Use around Mar 8 as the outdoor planting window for ZIP 73102.

Seed starting schedule

Spinach dates for Oklahoma City, OK

Step	Date	How to use it
Direct Sow	March 8, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Oklahoma City?

Oklahoma City (ZIP 73102) has an average last spring frost around Apr 5.

First frost

When is the first frost in Oklahoma City?

The average first fall frost is around Oct 30, giving about 208 frost-free days.

Season map

Spinach windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Mar 8

Harvest

Apr 22

Frost watch

Sep 15

Reminder workflow

Every date has a next action

Direct sow spinachMar 8

Last frost windowApr 5

First spinach harvest windowApr 22

Last spinach sowing targetSep 15

Signal	Value	Why it matters
Last frost estimate	April 5, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	October 30, 2026	Fall planting counts backward from this date.
Season length	208 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

Oklahoma City frost history and USDA zone 7b shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

Oklahoma 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 30. A conservative last sowing target is around Sep 15.