When should I plant zucchini in ZIP 93721?

In ZIP 93721, the main zucchini target is around Mar 2, based on the representative Fresno frost station and USDA zone 9b.

When should I start zucchini seeds indoors in 93721?

Start zucchini seeds indoors in ZIP 93721 around Jan 30, about 21 days before the Feb 20 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 93721 planting calendar

When to plant zucchini in Fresno, CA - Zone 9b

Q: When is the first frost in Fresno?

Fresno (ZIP 93721) has an average first fall frost around Nov 25, leaving about 278 frost-free days.

In ZIP 93721, plant zucchini around Mar 2; this uses the Fresno frost station, USDA zone 9b, and zucchini timing rules.

Your Fresno calendar has a 278-day estimated frost-free season. This estimate uses the representative Fresno frost station, USDA zone 9b, and zucchini timing rules.

Source: fresno-yosemite frost station, USDA zone 9b, 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 9b Fresno frost station University of California Agriculture and Natural Resources Updated 2026-06-28

Read the method

Answer first

When to start zucchini seeds indoors in Fresno

In ZIP 93721, start zucchini seeds indoors around Jan 30, about 21 days before the Feb 20 last-frost estimate.

Start zucchini seeds indoors in Fresno around Jan 30, about 21 days before the Feb 20 last-frost estimate.

Seed starting schedule

Zucchini dates for Fresno, CA

Step	Date	How to use it
Start Indoors	January 30, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	March 2, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	March 2, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Fresno?

Fresno (ZIP 93721) has an average last spring frost around Feb 20.

First frost

When is the first frost in Fresno?

The average first fall frost is around Nov 25, giving about 278 frost-free days.

Season map

Zucchini windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Jan 30

Direct sow

Mar 2

Transplant

Mar 2

Harvest

Apr 26

Frost watch

Oct 1

Reminder workflow

Every date has a next action

Start zucchini indoorsJan 30

Last frost windowFeb 20

Direct sow zucchiniMar 2

Transplant zucchiniMar 2

First zucchini harvest windowApr 26

Last zucchini sowing targetOct 1

Signal	Value	Why it matters
Last frost estimate	February 20, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	November 25, 2026	Fall planting counts backward from this date.
Season length	278 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

Fresno frost history and USDA zone 9b shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

University of California Agriculture and Natural Resources 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 Nov 25. A conservative last sowing target is around Oct 1.