When the tomatoes and cucumbers wind down, don’t empty those pots. They have a second season in them. Cool-season crops grow well in fall because they sprout in warm soil, then mature in cool air that keeps leaves sweet and slows bolting.

The catch is time. Days shorten, growth slows and the first frost sets a hard deadline. Sow late and you end up with a pot of seedlings caught by the cold; count back from that frost date and pick quick crops, and you’ll be cutting salad into November.

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Count back from your first frost

Look up your average first frost date by ZIP code. Then, for each crop, add the days to maturity on the seed packet plus about 14 days, because plants grow more slowly as days shorten and nights cool. Count back that many days from your first frost. That’s your last good sowing date.

For example, with a first frost of October 20 and spinach at 45 days to maturity, add 14 days for 59 days total, and sow by about August 22. Frost-hardy crops such as spinach and kale keep growing after a light frost, so they give you extra slack; tender crops do not.

Crop	Days to maturity from seed
Radishes	25 to 30
Leaf lettuce and mesclun	30 to 45
Spinach	40 to 50
Bok choy	45 to 60 (baby leaves about 30)
Beets	50 to 60
Swiss chard	50 to 60 (baby leaves about 30)
Kale	50 to 65 (baby leaves about 25 to 30)
Short carrots	55 to 70
Broccoli from transplants	55 to 70

In zones 3 to 5, most fall sowing happens in mid to late summer. In zones 8 to 10, the first frost comes late or not at all, so wait until late summer heat breaks and sow through fall and into winter.

Fall crops that fit containers

Lettuce and mesclun

If you only grow one thing this fall, make it lettuce. A 12 to 16 inch pot 6 to 8 inches deep holds a full salad’s worth of loose-leaf lettuce or mesclun, sown thickly and cut as baby leaves.

Lettuce seed often fails to sprout when soil is above about 80°F. In late summer, sow in a shady spot or keep the pot in afternoon shade until seedlings appear. Lettuce tolerates light frost around 32°F, and covering it on colder nights adds weeks. Sow a new pot every 2 to 3 weeks to keep salads coming.

Spinach

Spinach gets sweeter after a frost, which is a nice reward for growing it late. It handles nights in the low 20s once established. Use a pot 6 to 8 inches deep and space plants about 3 to 4 inches apart.

Spinach seed sprouts poorly in soil above about 75°F, so late-summer sowings often come up patchy. Sow a little thicker than usual and keep the surface moist until seedlings appear, usually in 7 to 10 days.

Kale

Kale is often still going at Thanksgiving. It survives hard frosts down to the low 20s, and many types handle the teens. Give each plant a pot of at least 3 to 5 gallons and 12 inches deep.

Pick the lower leaves first and leave at least 5 or 6 leaves at the top so the plant keeps growing. Kale and other cabbage-family crops attract cabbage worms in early fall; a fine mesh cover keeps the white butterflies from laying eggs. The guide to insect mesh for a vegetable garden explains how to fit it over pots.

Swiss chard

Chard grows fast in early fall and adds bright red, yellow or pink stems to a patio. One plant needs about 2 to 3 gallons of mix and a pot 8 to 12 inches deep.

Cut outer leaves at the base when they reach 8 to 10 inches long. Chard handles light frosts but usually dies once temperatures fall into the low 20s, so cover it on cold nights to keep picking.

Radishes

Running late? Sow radishes. They’re ready in about 4 weeks. A pot just 6 inches deep works; space seeds about 2 inches apart.

Pull radishes as soon as they reach full size. Left too long, they turn pithy and hot. In fall they handle light frosts and grow crisper in cool weather.

Bok choy and Asian greens

Bok choy, tatsoi and mizuna grow quickly and like cool weather. Use a pot about 8 inches deep and space baby bok choy 6 inches apart.

Harvest baby bok choy at about 30 days, or let full-size heads grow for 45 to 60 days. Like kale, bok choy belongs to the cabbage family and draws the same pests, so cover it from the start.

Beets

You get two harvests from beets, tender greens early and roots later. They need a pot at least 8 to 10 inches deep, with plants 3 to 4 inches apart.

Each beet seed is a cluster that sends up 2 to 4 seedlings, so thin to one plant per spot once they reach 2 inches tall and add the thinnings to salads. Beets tolerate light frost and are ready in about 50 to 60 days.

Short carrots

Depth matters more than width for carrots. Choose short or round types and a pot at least 10 to 12 inches deep, with seeds about 2 inches apart after thinning.

Carrots take 55 to 70 days, so they need one of the earliest sowing dates. A few frosts make the roots sweeter, and in mild areas the pot can stand through early winter while you pull carrots as needed.

Broccoli from transplants

Broccoli is slow from seed, so buy transplants for fall. Each plant needs a pot of about 5 gallons and at least 12 inches deep.

Plant transplants 10 to 12 weeks before your first frost. Broccoli handles hard frosts down to about 28°F. After cutting the main head, leave the plant in place; side shoots keep coming for several weeks.

Green onions

Green onions fill gaps between other crops. Sow seeds in a pot 6 to 8 inches deep, or push onion sets 1 inch apart into the mix for a faster crop.

From sets, green onions are ready in about 3 to 4 weeks; from seed, about 60 days. They tolerate light frosts and keep growing in cool weather.

Match pot size to crop length

A pot that’s too shallow will stunt a fall crop faster than anything else. Roughly:

• Radishes, lettuce, spinach and green onions: 6 to 8 inches deep.
• Bok choy, chard and beets: 8 to 12 inches deep.
• Kale, carrots and broccoli: at least 12 inches deep, with 3 to 5 gallons per plant for kale and broccoli.

I like fabric grow bags for fall. A 10-gallon bag usually runs $3 to $8 each in multi-packs, fits two kale plants or a full salad sowing, and folds away after the season. They dry out faster than plastic pots, so check them every day or two during warm spells.

Put the pots where they get at least 6 hours of sun. Fall sun sits lower in the sky, so a spot that was sunny in June can be shaded by a fence or tree by October. Leafy greens manage with 4 to 5 hours.

Renew the growing medium after summer crops

After a summer of tomatoes, the mix is tired, packed down and low on nutrients. It’s reusable, but not as is.

Pull out the old plants and as many roots as you can. Loosen the mix, then add about 25 to 30 percent fresh potting mix or compost and a slow-release vegetable fertilizer at the label rate. The full method, including when old mix should not be reused, is in the guide to reusing potting soil.

Start with fresh mix if the summer plants died from root rot or wilt. Avoid planting the same crop family in the same pot twice in a row; leafy greens after tomatoes or squash is a good rotation. If you also want flowers on the patio this fall, keep them in their own pots, as in these fall container combinations, so you can feed and harvest the vegetables without disturbing them.

Water newly sown pots daily in warm late-summer weather until seedlings appear. Once nights cool, most fall pots need water every 2 to 4 days; push a finger an inch into the mix and water when it feels dry.

Stretch the harvest past the first frost

Want a few more weeks of picking? Use a floating row cover. Lightweight fabric adds a few degrees of protection, often about 2 to 4°F, while heavier frost blankets add more. Drape it over hoops or stakes so it does not press on the leaves, and weigh the edges down with stones.

Move pots against a south- or west-facing wall of the house as nights get colder. The wall gives off stored heat after sunset and blocks the wind. Group small pots together so they protect each other.

Once nights fall into the teens, most crops except kale and spinach stop producing. Harvest what remains, then decide whether to cover the hardiest pots for a winter crop or clear them for spring.

FAQ

When should I plant a fall vegetable container garden?

Count back from your first frost date by the crop’s days to maturity plus about 14 days. In most of the country this means sowing from mid summer to late summer, and from late summer into fall in zones 8 to 10.

Can I reuse the potting mix from my summer tomato pots?

Yes, if the tomatoes were healthy. Remove the old roots, add about 25 to 30 percent fresh mix or compost and a slow-release fertilizer, and plant a different crop family such as lettuce or kale.

What size pot do fall vegetables need?

Lettuce, spinach and radishes need pots only 6 to 8 inches deep. Kale and broccoli need at least 12 inches of depth and 3 to 5 gallons of mix per plant.

Which fall vegetables survive frost in containers?

Kale, spinach, broccoli and radishes handle hard frosts down to about 28°F, and kale and spinach often survive into the low 20s. Lettuce, chard and beets handle light frosts around 32°F.

Do fall container vegetables need fertilizer?

Yes, especially in reused summer mix. Mix in a slow-release vegetable fertilizer at planting, then use a liquid feed every 2 to 3 weeks for leafy crops.

Final thoughts

Fall vegetables in pots are mostly a calendar problem. Get the sowing date right and the rest is fairly forgiving: quick crops, refreshed mix, and a row cover folded somewhere you can find it in October.

Today, look up your first frost date and work out the last sowing date for one crop. For planting dates and frost-hardy crops, the University of Illinois Extension guide to planting a fall vegetable garden goes into more detail on timing.

Last update on 2026-10-02 / Affiliate links / Images from Amazon Product Advertising API