When should I plant zucchini in ZIP 33131?

In ZIP 33131, the main zucchini target is around Jan 11, based on the representative Miami frost station and USDA zone 11a.

When should I start zucchini seeds indoors in 33131?

Start zucchini seeds indoors in ZIP 33131 around Dec 11, about 21 days before the Jan 1 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 33131 planting calendar

When to plant zucchini in Miami, FL - Zone 11a

Q: When is the first frost in Miami?

Miami (ZIP 33131) has an average first fall frost around Dec 31, leaving about 364 frost-free days.

In ZIP 33131, plant zucchini around Jan 11; this uses the Miami frost station, USDA zone 11a, and zucchini timing rules.

Your Miami calendar has a 364-day estimated frost-free season. This estimate uses the representative Miami frost station, USDA zone 11a, and zucchini timing rules.

Source: miami-intl frost station, USDA zone 11a, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

Reviewed by GrowZone Editorial. Calculated from the miami-intl frost station and USDA zone 11a, last updated 2026-06-28.

In the Miami area, zucchini timing follows the Miami frost window, so the local ZIP date can differ from a broad zone-only calendar.

USDA zone 11a Miami frost station University of Florida IFAS Extension Updated 2026-06-28

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Answer first

When to start zucchini seeds indoors in Miami

In ZIP 33131, start zucchini seeds indoors around Dec 11, about 21 days before the Jan 1 last-frost estimate.

Start zucchini seeds indoors in Miami around Dec 11, about 21 days before the Jan 1 last-frost estimate.

Seed starting schedule

Zucchini dates for Miami, FL

Step	Date	How to use it
Start Indoors	December 11, 2025	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	January 11, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	January 11, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Miami?

Miami (ZIP 33131) has an average last spring frost around Jan 1.

First frost

When is the first frost in Miami?

The average first fall frost is around Dec 31, giving about 364 frost-free days.

Season map

Zucchini windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Dec 11

Direct sow

Jan 11

Transplant

Jan 11

Harvest

Mar 7

Frost watch

Nov 6

Reminder workflow

Every date has a next action

Start zucchini indoorsDec 11

Last frost windowJan 1

Direct sow zucchiniJan 11

Transplant zucchiniJan 11

First zucchini harvest windowMar 7

Last zucchini sowing targetNov 6

Signal	Value	Why it matters
Last frost estimate	January 1, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	December 31, 2026	Fall planting counts backward from this date.
Season length	364 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

Miami frost history and USDA zone 11a shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

University of Florida IFAS 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 Dec 31. A conservative last sowing target is around Nov 6.