When should I plant zucchini in ZIP 64106?

In ZIP 64106, the main zucchini target is around Apr 25, based on the representative Kansas City frost station and USDA zone 6b.

When should I start zucchini seeds indoors in 64106?

Start zucchini seeds indoors in ZIP 64106 around Mar 25, about 21 days before the Apr 15 last-frost estimate.

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 zucchini 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 zucchini around Apr 25; this uses the Kansas City frost station, USDA zone 6b, and zucchini 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 zucchini 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 zucchini seeds indoors in Kansas City

In ZIP 64106, start zucchini seeds indoors around Mar 25, about 21 days before the Apr 15 last-frost estimate.

Start zucchini seeds indoors in Kansas City around Mar 25, about 21 days before the Apr 15 last-frost estimate.

Seed starting schedule

Zucchini dates for Kansas City, MO

Step	Date	How to use it
Start Indoors	March 25, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	April 25, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	April 25, 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

Zucchini windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Mar 25

Direct sow

Apr 25

Transplant

Apr 25

Harvest

Jun 19

Frost watch

Aug 26

Reminder workflow

Every date has a next action

Start zucchini indoorsMar 25

Last frost windowApr 15

Direct sow zucchiniApr 25

Transplant zucchiniApr 25

First zucchini harvest windowJun 19

Last zucchini sowing targetAug 26

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	24-36 in	Airflow and root space affect yield.
Soil temperature	65 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

Zucchini timing notes

One or two healthy plants can feed a household. Zucchini prefers full sun, 24-36 in spacing, and soil near 65 F+.

For fall, count backward from Oct 20. A conservative last sowing target is around Aug 26.