What to plant in September USA
What to plant in September in the USA depends entirely on your zone — this page answers it for every band. September is the handover month. In the cold band, harvest and protect before the first frost. In the mild band, keep planting fall crops. In the hot band, September opens the best planting window of the year as the heat finally breaks.
September planting by region
| Band | Sow outdoors | Start indoors | Plant out | Harvest now |
|---|---|---|---|---|
|
Cold band USDA zones 3-5 |
Fast greens, spinach and radish under cover only. | Nothing. | Overwintering onions late month. | Everything — tomatoes, squash, corn, beans, potatoes, roots. |
|
Mild band USDA zones 6-7 |
Spinach, lettuce, radish, turnips, overwintering greens. | Overwintering brassicas. | Fall brassicas, overwintering onions. | Tomatoes, peppers, beans, squash, apples, late corn. |
|
Hot band USDA zones 8-10 |
Fall greens, carrots, beets, peas, brassicas — the main sowing month. | A second round of fall brassicas. | Fall tomato, pepper and brassica transplants. | Okra, southern peas, melons, sweet potatoes, early fall greens. |
September garden jobs
- Watch the forecast for the first frost and cover tender crops on cold nights.
- Harvest winter squash before frost and cure it somewhere warm and dry.
- Ripen green tomatoes indoors rather than gambling on the weather.
- Sow a cover crop on any bed you are finished with.
- Record what grew where before the beds are cleared and you forget.
Common September mistakes
- Leaving winter squash out through a frost, which ruins its storage life.
- Missing the first frost date and losing the whole tender crop overnight.
- Leaving beds bare over winter instead of sowing a cover crop.
- In the hot band, treating September as the end of the season rather than the start of the best one.
Turn September's jobs into a written plan. The USA Vegetable Garden Planner (printable PDF) has frost-date planning pages, bed layouts, crop rotation, a sowing log and a harvest tracker — 74 printable pages.
More USA planting guides
- What to plant in August USA
- What to plant in October USA
- Vegetable Planting Calendar USA
- Vegetable Growing Guides for the USA
Frequently Asked Questions
What can I plant in September in the USA?
In zones 8-10, almost everything cool-season — greens, carrots, beets, peas and brassicas. In zones 6-7, spinach, lettuce, radish, turnips and overwintering onions. In zones 3-5, fast greens under cover only.
When should I pick green tomatoes?
Before the first frost. Any fruit that has reached the breaker stage will ripen indoors at around 70F with flavour equal to vine-ripened fruit.
Should I plant garlic in September?
In the cold band, yes, late in the month. Elsewhere, October is usually better — garlic wants roots established but no top growth before hard freeze.
Last updated 25 August 2026
Turn This Month's Jobs Into A Plan
Month-by-month advice works best when it becomes a written sowing list, bed plan, and follow-up task list.
Plan the next step
Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.