When should I plant zucchini in ZIP 90012?

In ZIP 90012, the main zucchini target is around Jan 30, based on the representative Los Angeles frost station and USDA zone 10b.

When should I start zucchini seeds indoors in 90012?

Start zucchini seeds indoors in ZIP 90012 around Dec 30, about 21 days before the Jan 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 90012 planting calendar

When to plant zucchini in Los Angeles, CA - Zone 10b

Q: When is the first frost in Los Angeles?

Los Angeles (ZIP 90012) has an average first fall frost around Dec 15, leaving about 329 frost-free days.

In ZIP 90012, plant zucchini around Jan 30; this uses the Los Angeles frost station, USDA zone 10b, and zucchini timing rules.

Your Los Angeles calendar has a 329-day estimated frost-free season. This estimate uses the representative Los Angeles frost station, USDA zone 10b, and zucchini timing rules.

Source: los-angeles-civic-center frost station, USDA zone 10b, 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 10b Los Angeles 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 Los Angeles

In ZIP 90012, start zucchini seeds indoors around Dec 30, about 21 days before the Jan 20 last-frost estimate.

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

Seed starting schedule

Zucchini dates for Los Angeles, CA

Step	Date	How to use it
Start Indoors	December 30, 2025	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	January 30, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	January 30, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Los Angeles?

Los Angeles (ZIP 90012) has an average last spring frost around Jan 20.

First frost

When is the first frost in Los Angeles?

The average first fall frost is around Dec 15, giving about 329 frost-free days.

Season map

Zucchini windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Dec 30

Direct sow

Jan 30

Transplant

Jan 30

Harvest

Mar 26

Frost watch

Oct 21

Reminder workflow

Every date has a next action

Start zucchini indoorsDec 30

Last frost windowJan 20

Direct sow zucchiniJan 30

Transplant zucchiniJan 30

First zucchini harvest windowMar 26

Last zucchini sowing targetOct 21

Signal	Value	Why it matters
Last frost estimate	January 20, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	December 15, 2026	Fall planting counts backward from this date.
Season length	329 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

Los Angeles frost history and USDA zone 10b 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 Dec 15. A conservative last sowing target is around Oct 21.