10 Vegetables You Can Still Plant in September

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September is not the end of the vegetable garden—it is the start of a cooler, often easier growing season.

Fast roots and cold-tolerant greens can go from seed to supper before winter, and gardeners in mild climates may harvest for months. The trick is choosing the crop by your first-frost date, not the calendar alone. Save this guide, find your region below, and turn that newly empty summer row into one more delicious harvest.

First, find your average first-frost date. Then count backward from it using the timing in each crop section. For a full-size harvest, add roughly two weeks to the packet’s days-to-maturity because shortening autumn days slow growth. Treat the result as a guide rather than a guarantee: warm soil can delay germination, while a simple row cover may buy several valuable degrees on a cold night.

Assorted vegetable seed packets ready for plantingSeptember is still seed-sowing season in much of the country.

 

Save this: your regional September cheat sheet

Region Best September strategy
Cold North, high elevations, roughly Zones 3–5 Sow radishes and baby arugula early in the month. Plant spinach for baby leaves or overwintering, and use transplants for lettuce, kale, and Asian greens. Keep row cover ready.
Middle latitudes, roughly Zones 6–7 Early September suits radishes, turnips, spinach, leaf lettuce, and quick Asian greens. Try beets or carrots only with a late first frost, a fast variety, or protection. Keep sowing baby greens later.
Mild-winter regions, roughly Zones 8–9 Plant most of this list from mid-September onward. Make small sowings every 7–14 days instead of one giant planting.
Warm South and frost-light climates, roughly Zones 10–11 Wait for soil and nights to cool, often late September or October. Shade cloth and steady moisture help seeds germinate while afternoons are still hot.

Your frost date beats your USDA hardiness zone for fall timing. Zones describe typical winter lows, not the date cold arrives. A high-elevation Zone 7 garden and a coastal Zone 7 garden may have very different September calendars.

Table of Contents show

1. Radishes: the speedy fall reset

A hand holding freshly harvested red radishes with leafy tops
Round red radishes can be ready just a few weeks after sowing.

Harvest window: about 22–35 days for small round varieties. Direct-sow radishes until roughly four weeks before your first hard freeze. In warmer regions, September sowings often make sweeter, crisper roots than summer plantings.

Choose quick varieties such as ‘Cherry Belle,’ ‘French Breakfast,’ or ‘Rover.’ Sow about 1/2 inch deep and thin to 1–2 inches apart. Crowded radishes grow handsome leaves and disappointing roots.

Keep the top inch of soil evenly moist. A dry spell followed by heavy watering encourages splitting, while heat and drought turn the flavor aggressively peppery. Harvest as soon as the shoulders reach the expected size; an extra week can take a radish from snappy to spongy.

2. Spinach: plant now, harvest now—or in spring

Young spinach plants growing in rows
Young spinach forms a low rosette of smooth, deep-green leaves.

Harvest window: about 25–35 days for baby leaves and 40–50 days for mature leaves. Sow six to eight weeks before a hard freeze for a fall crop. Even when it does not size up before winter, well-rooted spinach can rest beneath cover and surge back surprisingly early in spring.

Spinach germinates reluctantly in hot soil. If September still feels like August, chill the seed in the refrigerator for several days, sow in late afternoon, and shade the row with burlap or a board until sprouts appear. Remove the cover immediately at germination.

Cold-hardy choices such as ‘Bloomsdale Long Standing,’ ‘Giant Winter,’ and ‘Space’ are good bets. Pick outer leaves and leave the center growing, or shear baby leaves about an inch above the crown for a possible second cut.

3. Arugula: a peppery crop built for short days

Mature arugula plant with deeply lobed leaves and small flowers
Arugula’s elongated, lobed leaves are easy to recognize.

Harvest window: about 20–25 days for baby leaves and 35–45 days for full-size leaves. Arugula is one of the safest late September gambles because you can eat it young. Broadcast seed for a cut-and-come-again patch or space plants 4–6 inches apart for larger rosettes.

The first cool nights soften arugula’s bite. Heat makes it sharper and encourages flowering, so warm-climate gardeners should wait until the forecast finally bends downward.

For a long harvest, sow a short row every 7–10 days. Flea beetles sometimes pepper the leaves with tiny holes; lightweight insect netting installed immediately after sowing works better than chasing the beetles later.

4. Leaf lettuce: quicker and more forgiving than heads

Healthy green leaf lettuce plant growing in a container
Leaf lettuce makes an open rosette instead of a tight head.

Harvest window: about 25–30 days for baby leaves and 45–60 days for mature plants. In a short fall, choose loose-leaf types rather than waiting for a full romaine or butterhead to form. ‘Black Seeded Simpson,’ ‘Salad Bowl,’ and ‘Red Sails’ are reliable classics.

Lettuce seed needs light and cool conditions. Press it onto the surface or barely cover it, then mist gently. A thin layer of fine compost helps hold moisture without burying the seed too deeply.

Thin seedlings early—and eat the thinnings. Give mature leaf lettuce 6–8 inches, but crowd a dedicated baby-leaf row and cut it young. In warm regions, morning sun and afternoon shade can be the difference between germination and an empty row.

5. Turnips: two harvests from one row

White and purple turnip roots with green leaves
Turnips produce edible roots and a full crown of edible greens.

Harvest window: about 20–30 days for greens and 30–45 days for baby roots. Sow five to eight weeks before a hard freeze. Salad turnips such as ‘Hakurei’ mature fast and are sweet enough to eat raw; classic purple-top types take longer but handle cold well.

Sow 1/4–1/2 inch deep, then thin root crops to 3–4 inches apart. You can leave a denser section specifically for greens.

Take only one or two leaves from plants you want to form roots. Removing the whole top stops the root’s growth. Flea beetles and cabbage worms also appreciate turnips, so cover the bed with insect netting before pests discover it.

6. Bok choy: the compact Asian green

Young bok choy plants with broad green leaves and pale stems in a garden
Young bok choy shows the broad leaves and thick stems that form its vase-shaped head.

Harvest window: about 30 days for baby bok choy and 45–60 days for full-size heads. ‘Toy Choy,’ ‘Bonsai,’ and other mini varieties are excellent when frost is close. Sow five to eight weeks before a hard freeze, or transplant starts for a head start.

Bok choy likes steady cool weather, but a sudden chilly spell followed by warmth can trigger bolting. Fall is often easier than spring because temperatures usually move in one direction.

Space mini types 4–6 inches apart and full-size types 8–12 inches apart. Harvest the entire head at soil level, or take the largest outside leaves. Tatsoi, mizuna, and komatsuna follow similar timing and give the “Asian greens” section of a seed rack plenty of September potential.

7. Kale: the crop that improves after frost

Lacinato kale plants with long blue-green crinkled leaves
Lacinato, or dinosaur, kale has long blue-green leaves with a pebbled texture.

Harvest window: about 25–30 days for baby leaves and 50–65 days for mature leaves. Direct-sow for baby kale, but use transplants if your frost comes early and you want large plants. ‘Winterbor,’ ‘Red Russian,’ and lacinato types all tolerate chilly weather.

Cold does more than keep kale alive: it can make the leaves taste sweeter as the plant accumulates soluble sugars. That is why a leaf picked after a light frost may seem less bitter than its summer cousin.

Harvest from the bottom up and never cut the central growing point. A well-established plant can keep producing through repeated light frosts, especially under row cover. Give mature plants 12–18 inches so damp autumn air can move between them.

8. Mustard greens: maximum flavor on a short clock

Ruffled green mustard leaves growing in a garden
Mustard greens can be smooth, curled, or deeply frilled, depending on the variety.

Harvest window: about 20–30 days for baby greens and 35–50 days for mature leaves. Mustard is fast, bold, and happier in September than during a heat wave. ‘Green Wave,’ ‘Red Giant,’ and frilly mizuna bring different colors and levels of heat to the bowl.

Sow 1/4 inch deep and thin to 4–8 inches for mature plants. Baby leaves can grow much closer together.

Harvest small leaves for salads and larger leaves for sautés, soups, or braises. A light frost often softens the flavor, though hardiness varies by variety. The same insect netting that protects turnips and bok choy will keep cabbage worms off mustard.

9. Beets: grow the greens even if the roots run out of time

Rows of red beet plants growing in a September garden
Beet leaves often show red stems and veins well before the roots swell.

Harvest window: about 25–30 days for baby greens and 50–60 days for roots. Beets are a smart early-September sowing in middle climates and a dependable fall crop in mild ones. Faster choices include ‘Early Wonder Tall Top’ and baby beets harvested at golf-ball size.

That craggy “seed” in your packet is usually a dried fruit cluster containing several seeds. One spot may produce multiple seedlings, so thinning is not optional. Snip extras at soil level to avoid disturbing the keeper’s young root.

Sow 1/2 inch deep and thin to roughly 3 inches. Eat the thinnings like baby chard. Consistent moisture prevents woody roots, while a light mulch keeps the seedbed from crusting.

10. Carrots: worthwhile where fall lingers

Rows of feathery green carrot foliage growing in soil
Carrot seedlings grow into fine, fernlike foliage above the hidden roots.

Harvest window: roughly 55–65 days for fast varieties, longer in cool short days. Carrots are the least forgiving crop on this list for cold regions, but they are excellent September candidates where the first hard freeze is eight to ten weeks away—or where the soil rarely freezes.

Choose quick, shorter-rooted varieties such as ‘Paris Market,’ ‘Little Finger,’ or ‘Mokum.’ Sow on stone-free soil, barely cover the seed, and never let the surface dry while you wait up to three weeks for germination.

Try the board trick: lay a narrow board or damp burlap over the seeded row to hold moisture, check daily, and remove it the moment seedlings appear. Mature carrots tolerate cold and often taste sweeter after chilly nights, but dig them before frozen ground turns harvest into archaeology.

The simplest September rule is to plant for the smallest useful harvest. Baby leaves, tender thinnings, and golf-ball roots reach the kitchen sooner than full-size crops. Add insect netting while days are warm, switch to frost cloth as cold arrives, and water in the morning so foliage is not wet all night.

What’s your ZIP code? Let’s see what you can still grow.

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