What to Plant in September — Fall Garden Guide by Zone 2026

What to plant in September by USDA hardiness zone

Zones 5–6 — Last call for fall planting

In Zones 5-6 (Upper Midwest, New England, Mountain states), September is the final chapter of the growing season. First frost typically arrives in October, giving you roughly 4-6 weeks of productive growing time. Every planting decision must be calculated against that hard deadline.

• By September 1–10: Get broccoli and kale transplants in the ground — these need at least 50-60 days before hard frost. Direct sow radishes, arugula, and baby spinach for harvest before freeze.
• By September 15–30: Plant garlic cloves — this is peak garlic planting season for these zones. Direct sow winter-hardy spinach varieties (Tyee, Bloomsdale). Overseed cover crops (winter rye, hairy vetch) in beds that are done for the season.
• Also this month: Plant spring flowering bulbs (tulips, daffodils, alliums) in the second half of September through October. These go in the same time as garlic and need similar conditions.

Zones 7–8 — Peak fall planting month

For Zone 7-8 (Mid-Atlantic, Pacific Northwest, much of the South), September is arguably the most important planting month of the year. First frost arrives in November or later, giving you 8-10 weeks for fall crops to mature. This is your highest-productivity window of the year.

• Brassica transplants (all month): Broccoli, cauliflower, cabbage, Brussels sprouts, and kale all thrive when transplanted throughout September. Zone 8 can continue into October. Space broccoli and cauliflower 18-24 inches apart, kale and cabbage 12-18 inches.
• Direct sow (all month): Beets (don't transplant — direct sow only), carrots (Nantes or Chantenay types), turnips, radishes, lettuce mixes, spinach, Swiss chard, and Asian greens. Succession sow every 2 weeks for continuous harvest.
• Garlic (second half of September): Zone 7-8 garlic planting peak is mid-September through October. Choose softneck for Zone 8 (milder winters), hardneck for Zone 7. Plant 2 inches deep, 6 inches apart, mulch with 4 inches of straw after soil cools.

Zones 9–11 — Fall season begins in earnest

In warm-winter zones (Southern California, Texas, Gulf Coast, Florida, Hawaii), September is when your vegetable garden finally recovers from summer heat stress. The planting calendar almost reverses — September here is the equivalent of March-April in northern zones, and it's your most exciting month to be a gardener.

• Cool-season crops begin: Start lettuce, spinach, kale, broccoli, cauliflower, and cabbage transplants as soon as temperatures drop below 90°F consistently. Direct sow beets, carrots, turnips, and radishes.
• Fall tomatoes and peppers: Zone 9-11 can plant tomato and pepper transplants in early September for a fall harvest running through November-January. Choose varieties with shorter days to maturity: Celebrity (70 days), Juliet (60 days), or cherry tomatoes.
• Garlic: Wait until late October or November when soil temperatures drop consistently below 65°F. Planting garlic while soil is still warm in Zone 9-11 causes excessive top growth before proper root development.

September planting calendar by USDA zone

⚡ = urgent action — do not delay past this window to guarantee harvest before first frost.

Fast-growing crops for September (25–60 days)

These crops can be direct-sown in September and harvested before or around first frost in most zones — ideal for squeezing in one final productive wave:

How to plant garlic in September — step by step

Garlic planted in September or October is one of the most rewarding harvests of the entire year. It overwinters quietly underground with almost no maintenance, then delivers heads in June-July the following summer. Here's how to do it right.

1. Break the bulb into cloves the day before planting. Select only the largest, firmest cloves — they produce the biggest heads. Save small inner cloves for cooking.
2. Prepare the bed: Loosen soil to 8-10 inches deep and incorporate 2-3 inches of compost. Garlic requires excellent drainage — soggy soil causes basal rot. Raised beds are ideal for heavy clay soils.
3. Plant pointed end up, 2 inches deep, 6 inches apart in rows 12 inches apart. Firm the soil gently around each clove so there are no air pockets.
4. Water in well after planting, then hold off until you see 1-2 inches of top growth (usually 2-3 weeks). Overwatering before sprouting is the most common garlic mistake.
5. Mulch after planting with 4-6 inches of straw or shredded leaves. This insulates cloves through winter, retains moisture, and suppresses spring weeds. Do not skip this step in Zones 5-6.

Cover crops: the best use of empty September beds

Every empty garden bed in September is a missed opportunity. Cover crops protect bare soil from erosion, suppress weeds, and dramatically improve soil health — all with minimal effort. Sow now and turn them under in spring, 2-4 weeks before planting.

• Winter rye: The toughest option — germinates in cold soil (as low as 34°F), survives Zone 3 winters. Best for Zones 3-7. Sow at 2 lbs per 1,000 sq ft.
• Crimson clover: Fixes nitrogen, produces beautiful red flowers in spring that pollinators love. Best for Zones 6-9. Sow at 1 lb per 1,000 sq ft.
• Hairy vetch: Aggressive nitrogen fixer, winter hardy to Zone 5. Mix with winter rye for a powerhouse combination that outcompetes any weed.
• Field peas: Fast-establishing with good nitrogen fixation. For Zones 6+, sow in September for late fall and early spring coverage.

Frequently asked questions about what to plant in September