What to Plant in September — USDA Zone 9a

Here's everything you can start, transplant, sow, and harvest in September in USDA Zone 9a. This zone has an average last spring frost around February 10 and first fall frost around December 10, with a growing season of approximately 303 days.

There are 27 planting activities for September in Zone 9a.

Zone 9a Year-round

303 days

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Last Spring Frost February 10

➔ 303 growing days ➔

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First Fall Frost December 10

Harvest in September

Plant	Type	Days to Maturity
Ageratum	Flower	60–75 days
Alpine Strawberries	Fruit	90–180 days
Artichoke	Vegetable	120–180 days
Begonias	Flower	70–90 days
Celosia	Flower	60–90 days
Chayote	Vegetable	120–180 days
Cosmos	Flower	60–90 days
Dahlias	Flower	70–120 days
Daylily	Flower	60–90 days
Gaillardia (Blanket Flower)	Flower	70–100 days
Geraniums	Flower	70–100 days
Gladiolus	Flower	70–100 days
Horseradish	Vegetable	120–180 days
Impatiens	Flower	60–75 days
Jicama	Vegetable	120–180 days
Nasturtium	Flower	55–65 days
Petunia	Flower	70–90 days
Portulaca	Flower	50–70 days
Rosemary	Herb	80–180 days
Roses	Flower	90–180 days
Salvia	Flower	70–90 days
Strawberries	Fruit	90–365 days
Sunflower	Flower	70–100 days
Valerian	Herb	120–180 days
Vinca (Annual)	Flower	70–90 days
Yam	Vegetable	180–330 days
Zinnia	Flower	60–70 days

Plant varieties + growing data

Soil survey + temperature data

Drought monitoring

Household-consumption benchmarks

Derived

Other

Frost dates

Modeling

Precipitation + climate normals

Curated

Pest + disease pressure

Local extension offices

Daylight hours + sun data

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