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What to Plant in September — USDA Zone 4b

Here's everything you can start, transplant, sow, and harvest in September in USDA Zone 4b. This zone has an average last spring frost around May 1 and first fall frost around October 3, with a growing season of approximately 155 days.

There are 73 planting activities for September in Zone 4b.

Zone 4b Moderate season
155 days
❄
Last Spring Frost May 1
➔ 155 growing days ➔
❄
First Fall Frost October 3

Where Is Zone 4b?

AL — Zone 7b AL AR — Zone 7b AR AZ — Zone 8a AZ CA — Zone 9a CA CO — Zone 5a CO CT — Zone 6b CT DE — Zone 7a DE FL — Zone 9a FL GA — Zone 7b GA IA — Zone 5a IA ID — Zone 5b ID IL — Zone 5b IL IN — Zone 6a IN KS — Zone 6a KS KY — Zone 6b KY LA — Zone 8b LA MA — Zone 6a MA MD — Zone 7a MD ME — Zone 4b ME MI — Zone 5b MI MN — Zone 4a MN MO — Zone 6a MO MS — Zone 8a MS MT — Zone 4b MT NC — Zone 7a NC ND — Zone 3b ND NE — Zone 5a NE NH — Zone 5a NH NJ — Zone 7a NJ NM — Zone 6b NM NV — Zone 6b NV NY — Zone 5b NY OH — Zone 6a OH OK — Zone 7a OK OR — Zone 7a OR PA — Zone 6a PA RI — Zone 6b RI SC — Zone 8a SC SD — Zone 4a SD TN — Zone 7a TN TX — Zone 8a TX UT — Zone 5b UT VA — Zone 7a VA VT — Zone 4b VT WA — Zone 7a WA WI — Zone 4b WI WV — Zone 6a WV WY — Zone 4a WY AK — Zone 2a AK HI — Zone 11a HI
Zones: 1 2 3 4 5 6 7 8 9 10 11

Harvest in September

Plant Type Date Range Days to Maturity
Acorn Squash Vegetable 80–100 days
Alpine Strawberries Fruit 90–180 days
Amaranth Vegetable 90–120 days
Anise Herb 90–120 days
Basil Herb 50–75 days
Bee Balm Herb 90–120 days
Belgian Endive Vegetable 110–150 days
Black Beans Vegetable 90–120 days
Brussels Sprouts Vegetable 90–130 days
Butternut Squash Vegetable 85–110 days
Cantaloupe Fruit 70–90 days
Catnip Herb 60–80 days
Celeriac Vegetable 100–120 days
Celery Vegetable 80–120 days
Chamomile Herb 60–90 days
Chickpeas Vegetable 80–110 days
Chives Herb 60–90 days
Christmas Lima Beans Vegetable 80–100 days
Comfrey Herb 60–90 days
Corn Vegetable 60–100 days
Crosne Vegetable 150–200 days
Cucumber Vegetable 50–70 days
Delicata Squash Vegetable 80–100 days
Echinacea Herb 120–180 days
Edamame Vegetable 75–100 days
Fennel Vegetable 60–90 days
Fennel (herb) Herb 60–90 days
Garlic Chives Herb 60–90 days
Green Beans Vegetable 50–65 days
Ground Cherry Fruit 65–80 days
Honeydew Fruit 80–110 days
Horehound Herb 75–90 days
Horseradish Vegetable 120–180 days
Hubbard Squash Vegetable 100–120 days
Hyssop Herb 70–90 days
Kabocha Vegetable 85–100 days
Kidney Beans Vegetable 85–110 days
Leeks Vegetable 90–150 days
Lentils Vegetable 80–110 days
Lovage Herb 70–90 days
Melon Vegetable 70–100 days
Mint Herb 60–90 days
Onion Vegetable 90–120 days
Oregano Herb 60–90 days
Parsnip Vegetable 100–130 days
Peppers Vegetable 60–90 days
Pole Beans Vegetable 55–70 days
Potatoes Vegetable 70–120 days
Pumpkin Vegetable 85–120 days
Rue Herb 70–90 days
Sage Herb 75–90 days
Salsify Vegetable 100–130 days
Savoy Cabbage Vegetable 70–110 days
Shallot Vegetable 90–120 days
Shiso Vegetable 50–70 days
Snap Peas Vegetable 55–70 days
Soybeans Vegetable 80–120 days
Spaghetti Squash Vegetable 85–100 days
Squash (Summer) Vegetable 45–65 days
Squash (Winter) Vegetable 80–120 days
Strawberries Fruit 90–365 days
Sunchoke Vegetable 110–150 days
Sunflower Vegetable 70–100 days
Tarragon Herb 60–90 days
Thai Basil Herb 50–75 days
Thyme Herb 70–90 days
Tomatillo Vegetable 60–85 days
Tomatoes Vegetable 60–85 days
Valerian Herb 120–180 days
Watermelon Vegetable 70–100 days
Wax Beans Vegetable 50–65 days
Yarrow Herb 90–120 days
Zucchini Vegetable 45–60 days

Other Months for Zone 4b

September Planting by State

Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals, University Cooperative Extension planting guides. Planting dates are estimates based on average frost dates — local conditions may vary. Last updated: April 2026.

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