What to Plant in October: Garlic Month, Cover Crops, and the Southern Fall Garden

October is garlic month. In zones 3 through 7 it’s the one crop nearly everyone should be planting, it’s the only thing going in the ground that you’ll harvest next July, and the window is genuinely a window — a few weeks wide, not a season.

North of zone 7 the rest of October is closing-down work: cover crops against a hard deadline, cold frames over the greens you sowed in September, and a countertop full of green tomatoes to deal with. South of it, October is still a planting month, and in zones 9-10 it’s the best one of the year.

Here’s what to plant in October, zone by zone. September’s guide covers the overwintering sowings that should already be in the ground.

Zones 3-4: Garlic in Week One, Then Close the Beds

First frost: September 12–15, so it’s already behind you

Everything this month is about next spring or about protecting what’s already planted. Move fast — the ground here starts to firm up sooner than the calendar suggests.

Plant in the first week:

• Garlic, if it isn’t in yet. The last week of September is ideal in zones 3-4; the first week of October is the outside edge. After that the cloves won’t root enough before the ground freezes.
• Winter rye, if any bed is still bare. Rye germinates in soil down to about 40°F, which is why it’s the only cover crop left this late.

Cover, don’t sow:

• Get a low tunnel or cold frame over the September spinach and mâche. Row cover buys 2–4°F; a low tunnel adds roughly 10°F plus wind protection, which is what carries greens through a zone 3 winter.
• Mulch the garlic bed with four inches of straw once the top inch of soil has frozen, not before. Mulching warm soil invites voles into the best-insulated real estate in your garden.

Clean up:

• Pull and compost spent annuals; leave the roots of legumes in place
• Drain and store hoses and drip lines before the first hard freeze splits them
• Empty containers or move them under cover — wet potting mix freezing and thawing all winter cracks pots

Pro tip: Overwintering greens under cover don’t need water the way summer beds do, but they do need it. Check the soil under the tunnel once a month on a thaw day. More zone 3-4 cold frames fail from drought than from cold, because nobody thinks to water in January.

Zones 5-6: Garlic Month Proper

First frost: October 8 in zone 5, October 15 in zone 6

This is the month zones 5-6 have been prepping for since September. Garlic goes in a week or two after your frost date, which lands mid-to-late October in zone 5 and late October in zone 6.

Plant:

• Garlic — hardneck varieties, which handle these winters better than softnecks and give you scapes in June
• Shallots and multiplier onions, alongside the garlic and on the same schedule
• Overwintering onion sets in zone 6, mid-October. Zone 5 is marginal without a low tunnel, so plan on covering them.
• Winter rye through the first week of October in zone 5, mid-October in zone 6. That’s the hard deadline for cover crops here.

Sow under cover only:

• Spinach, mâche, and claytonia in a cold frame for late-winter cutting. These won’t size up before the days get short — they’ll hold, and grow again in February.

Harvest and protect:

• Leave carrots, parsnips, kale, and Brussels sprouts in the ground. Frost converts their starch to sugar, and a November carrot is a better carrot.
• Mulch carrots and parsnips with six inches of leaves after the first hard frost and dig them all winter
• Cold frames and low tunnels go up over anything you still want to eat in December

Pro tip: Plant garlic cloves pointy end up, two inches deep, in a bed that hasn’t grown alliums in three years. White rot and nematodes accumulate in allium beds and neither one is fixable once established. If your crop rotation is loose everywhere else, tighten it here.

Zones 7-8: Garlic and the Hardy Greens

First frost: October 25 in zone 7, November 15 in zone 8

Zone 7 plants garlic right around its frost date, mid-October into early November. Zone 8 plants mid-October and still has a month of open season behind it.

Plant garlic and alliums:

• Zone 7: mid-October through the first week of November, hardneck or softneck
• Zone 8: mid-October, and softneck varieties do better here than hardnecks
• Overwintering onion sets and shallots in both zones, on the garlic schedule

Zone 8, direct sow:

• Radishes as late as October 4 for a sized-up crop; after that they’re a baby-root gamble
• Spinach, mâche, and arugula all month — these overwinter rather than finishing, and they’re worth the seed
• Turnips and mustard greens through mid-month for greens rather than roots

Transplant:

• Kale, collards, and chard through the first half of October in zone 8. They’ll size up slowly and hold all winter.
• Zone 7 kale transplants are past their sizing-up date but will establish and overwinter under cover
• Topping off containers and cold frame beds for winter greens goes better with fresh mix than with tired summer soil — the container soil mix recipes have the ratios

Cover crops:

• Winter rye through late October in zone 7 and into November in zone 8
• Crimson clover and hairy vetch also still work in zone 8 for a nitrogen-fixing cover you turn under in March

Pro tip: Zone 7’s first frost is an average, and averages hide the cold hollows. If your garden sits at the bottom of a slope it will frost a week or more before the neighborhood does. Stage row cover from about October 10 and don’t wait for a forecast that names your street.

Zones 9-10: The Best Month of the Year

First frost: December 5 in zone 9; zone 10 rarely freezes

Zone 9 gets a full planting month with a frost date still two months out. Zone 10 barely acknowledges the concept.

Direct sow:

• Lettuce through the first week of October in zone 9 for full heads, all month for baby leaf; zone 10 sows lettuce continuously into February
• Radishes as late as October 24 in zone 9
• Carrots, beets, and turnips early in the month
• Snow and snap peas — fall is the better pea season in the hot zones, and October is when they go in
• Cilantro, dill, and parsley, all of which finally behave now that the heat has broken

Transplant:

• Broccoli, cauliflower, and cabbage early in the month. Zone 9’s count-back deadline was mid-September, so October transplants head up later and smaller — but all three take a light frost, so a December harvest is fine.
• Kale, collards, and chard any time this month
• Strawberry crowns for a spring crop

Start in trays:

• Lettuce and brassicas for November and December transplant, which keeps the succession going through winter. If trays are new to you, the seed starting guide covers the setup.

Garlic here is different: softneck varieties only, and the cloves need four to eight weeks in the refrigerator before planting to substitute for a winter these zones don’t have. Chill now, plant in November, and expect smaller bulbs than a northern gardener gets.

Pro tip: Zone 10 gardeners routinely plant tomatoes in October for a winter crop, and it works — nights are finally below 75°F, so blossoms actually set. Use determinate or cherry types and get them in during the first half of the month.

What to Do With Green Tomatoes

Every gardener from zone 3 through zone 7 ends October with a pile of green tomatoes and bad information about them. The useful facts are short.

Tomatoes ripen off the vine as long as they’ve reached mature green — full size, with a pale glossy blush at the blossom end. Pick those, leave them on a counter out of direct sun, and most will color up over two to four weeks. A windowsill in full sun cooks them; a paper bag with a banana speeds it up but also speeds up rot, so check daily either way. Anything still small and matte-dark green won’t ripen no matter what you do — that’s what fried green tomatoes, chow-chow, and green tomato salsa exist for.

Pull the whole plant before the first hard freeze rather than picking through it. Hang it upside down in a garage or basement and the fruit ripens on the vine over several weeks, which beats a countertop.

October Planting Checklist

Universal October tasks no matter where you garden:

1. Plant garlic — the headline crop of the month in zones 3 through 8, and the one thing you can’t do in November
2. Get the last cover crop in — winter rye, on a deadline that runs from the first week of October in zone 5 to November in zone 8
3. Put the covers up — cold frames, low tunnels, and row cover over anything you intend to eat after Thanksgiving
4. Plant the fall garden in zones 9-10 — peas, lettuce, roots, and brassicas; this is the best planting month those zones get
5. Deal with the green tomatoes — pull whole plants before the first hard freeze rather than picking twice
6. Mulch after the ground firms, not before — early mulch on warm soil is a vole hotel

The One Thing Not to Skip

Plant the garlic. It’s twenty minutes of work for a crop that needs nothing from you until June, it’s the single highest return per square foot in the fall garden, and there’s no second chance — miss October and the answer isn’t November, it’s next year.

Everything else this month is a judgment call about how far past your frost date you want to push, and that’s count-back math. The fall vegetable planting guide has the formula and the frost dates behind every deadline above.

Check your zone’s detailed planting schedule:

• Zone 5 Planting Calendar — Chicago, Columbus, Boston
• Zone 6 Planting Calendar — Philadelphia, Nashville, Portland
• Zone 7 Planting Calendar — Charlotte, Atlanta, Dallas
• Zone 8 Planting Calendar — Austin, New Orleans, Sacramento
• All zone calendars — zones 2 through 11

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