When should I plant spinach in ZIP 64106?

In ZIP 64106, the main spinach target is around Mar 18, based on the representative Kansas City frost station and USDA zone 6b.

When should I start spinach seeds indoors in 64106?

Spinach is usually direct-sown for ZIP 64106. Use the Mar 18 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 64106 planting calendar

When to plant spinach in Kansas City, MO - Zone 6b

Q: When is the first frost in Kansas City?

Kansas City (ZIP 64106) has an average first fall frost around Oct 20, leaving about 188 frost-free days.

In ZIP 64106, plant spinach around Mar 18; this uses the Kansas City frost station, USDA zone 6b, and spinach timing rules.

Your Kansas City calendar has a 188-day estimated frost-free season. This estimate uses the representative Kansas City frost station, USDA zone 6b, and spinach timing rules.

Source: kansas-city-downtown 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.

USDA zone 6b Kansas City frost station University of Missouri Extension Updated 2026-06-28

Read the method

Answer first

When to start spinach seeds indoors in Kansas City

In ZIP 64106, spinach is usually direct-sown around Mar 18 instead of started indoors.

Spinach is normally direct-sown in Kansas City. Use around Mar 18 as the outdoor planting window for ZIP 64106.

Seed starting schedule

Spinach dates for Kansas City, MO

Step	Date	How to use it
Direct Sow	March 18, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Kansas City?

Kansas City (ZIP 64106) has an average last spring frost around Apr 15.

First frost

When is the first frost in Kansas City?

The average first fall frost is around Oct 20, giving about 188 frost-free days.

Season map

Spinach windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Mar 18

Harvest

May 2

Frost watch

Sep 5

Reminder workflow

Every date has a next action

Direct sow spinachMar 18

Last frost windowApr 15

First spinach harvest windowMay 2

Last spinach sowing targetSep 5

Signal	Value	Why it matters
Last frost estimate	April 15, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	October 20, 2026	Fall planting counts backward from this date.
Season length	188 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

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

University of Missouri 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 20. A conservative last sowing target is around Sep 5.