How to Grow Kale

Updated August 2026 · Garden Advice Guide

Kale is one of the few vegetables that gets better after frost, not worse. Cold nights trigger the plant to convert stored starch into sugar as an antifreeze, so leaves picked after a couple of hard frosts taste noticeably sweeter and less bitter than anything you cut in July. That single fact should change your calendar: the fall crop is the real crop, and spring kale is the consolation prize.

Sow for fall, space plants 12 to 18 inches apart, pick the oldest leaves from the bottom while leaving the growing tip alone, and one plant will feed you from September into winter.

Not sure when to sow for your area? Get your sowing and transplant dates with our free When-to-Plant tool.

Why Frost Makes Kale Sweeter

Kale sitting in the low 20s is not suffering. It's protecting itself.

When leaf temperature drops toward freezing, the plant breaks down starch reserves into simple sugars and pushes them into the cell fluid. Sugary fluid freezes at a lower temperature than plain water, so the cells stay liquid while the air around them does not. You taste that sugar directly. The same leaf that was sharp and cabbagey in August turns mild and almost sweet in November.

The threshold is real frost, not just chilly weather. Two or three nights at or below 28F make an obvious difference. Established plants handle the mid-20s with no protection at all, and hardy types shrug off single digits under a row cover.

This is also why kale from a grocery store in summer tastes so different from kale off your own plant in December. Nothing about the variety changed. The weather did.

Spring Versus Fall Sowing

Both windows work. They are not equal.

Fall kale is sown in midsummer, grows through cooling weather, and hits its best flavor after the first frosts. It holds in the garden for weeks without going anywhere, because cold slows growth instead of ruining it. There is no deadline pressure, no bolting, and pest numbers fall off a cliff once nights cool.

Spring kale is sown 4 to 6 weeks before your last frost and produces well for about two months. Then days lengthen, heat arrives, and quality collapses. The plant senses long days and warmth, starts building a flower stalk, and pushes bitter compounds into the leaves. Spring kale is fine for baby leaf harvests, which come off fast, but it rarely makes a good full-size plant.

Summer kale is the version most beginners try, and it's the reason many decide they dislike kale. Heat does three things at once:

• Bitterness climbs. Glucosinolates, the compounds behind kale's sharp edge, concentrate under heat and drought stress. Sugar stays low because there is no cold signal.
• Texture toughens. Leaves grown fast in hot sun build thicker cell walls and heavier midribs.
• Pests peak. Cabbage white butterflies, aphids, and flea beetles all hit their highest populations in July and August. A summer plant fights all three at once.

If you have one shot at a kale crop, take the fall one.

Kale Varieties and Which One to Plant

Kale is not one plant with one texture. Picking the wrong type for the job is a common quiet failure, especially for salads.

Ornamental kale is technically edible. It is bred entirely for pink and white centers, and the flavor is bitter and the texture is coarse. Plant it in a fall pot for color, and grow one of the others to eat.

If you want kale in a raw salad, grow Red Russian or lacinato. If you want kale that survives a Zone 4 winter under a low tunnel, grow a Siberian or curly type.

How to Grow Kale from Seed

Kale germinates fast and transplants well, so both direct sowing and starting in cells work fine.

1. Sow 1/4 to 1/2 inch deep. Seed comes up in 5 to 8 days at soil temperatures of 60 to 75F, and it will germinate down to 45F, just slower.
2. For a fall crop, start indoors or in a shaded spot. Midsummer soil is often too hot and dry for reliable direct sowing. Cells or 3 inch pots in bright shade give better stands.
3. Transplant at 4 to 5 weeks, when plants have 4 true leaves. Kale is far less fussy than broccoli about transplant age, but a root-bound plant still stalls.
4. Give it rich soil. Work 2 to 3 inches of compost into the bed before planting. Kale is a leafy crop, so nitrogen drives yield directly.
5. Aim for full sun, at least 6 hours. Fall plants tolerate 4 to 5 hours since the sun is weaker anyway, but they grow slower.
6. Water steadily, about 1 to 1.5 inches per week. Drought stress is one of the two things that make leaves bitter, heat being the other. Our watering guide has the depth math.
7. Side dress with nitrogen about 4 weeks after transplanting, and again 4 weeks later for a long fall crop.

Kale is a brassica, the same family as broccoli, cabbage, and collards. Keep it out of beds that grew brassicas in the last 3 years so club root and cabbage aphid populations do not build. Our crop rotation guide covers how to sequence that in a small garden.

Kale Spacing for Full Size Versus Baby Leaf

Spacing is the choice that decides what you are actually growing.

Full-size plants: 12 to 18 inches apart, rows 18 to 24 inches apart. At 18 inches a mature curly kale fills its space completely and produces the biggest leaves. At 12 inches you get more plants but smaller leaves, and airflow drops enough to make aphid outbreaks worse. In a 4 foot wide bed, two rows at 18 inches is the sweet spot.

Baby leaf: sow thickly in a band, roughly 1 inch apart, and skip thinning entirely. You are growing a cut-and-come-again patch, not individual plants. Cut the whole stand at 3 to 4 inches tall with scissors, an inch above the crown, and it regrows for 2 or 3 more cuttings before quality drops. This is where Red Russian shines.

In containers: one full-size plant per 3 to 5 gallon pot, minimum 10 inches deep. A 15 gallon tub holds 3 plants.

Our plant spacing guide has the full chart if you're laying out a mixed bed and need kale to sit next to something else.

Harvesting Kale So the Plant Keeps Producing

Kale is a cut-and-come-again crop, and the harvest method matters more than almost any other step.

Pick from the bottom up. Take the oldest, largest leaves at the base of the plant, snapping or cutting them close to the main stem. Take 3 to 5 leaves at a time and leave at least 6 to 8 leaves on top. The plant keeps growing upward from the central growing point, adding new leaves from the top while you remove old ones from below. Done right, a single plant can produce for 6 months and end up looking like a small palm tree on a bare stalk.

Do not cut the growing tip. This is the honest warning nobody gives beginners. The top rosette is the only growing point kale has. Cut it off, or strip the plant down to a bare stem chasing a big harvest, and the plant is finished. It will not push a new crown the way a lettuce or a chard will. You get a few small side shoots at best, then nothing.

Timing within the day helps too. Morning leaves are crisper and store longer, because they are fully rehydrated overnight.

For a baby leaf patch the rule inverts: cut everything at once, an inch above the soil, and let the whole stand regrow together.

Check the when to harvest reference if you're tracking several crops at once and want the maturity windows side by side.

Overwintering Kale in Cold Zones

In Zones 7 and warmer, kale often stands all winter with no help at all and you just keep picking.

In Zones 3 to 6, kale needs cover to survive, and the payoff is worth the effort. Established plants go semi-dormant below about 25F. They stop making new growth but hold the leaves they have, which stay edible and stay sweet.

What works:

• A low tunnel of row cover on hoops adds roughly 4 to 8F of protection and blocks drying wind, which kills more overwintered plants than cold does.
• A second layer, either heavier fabric or a plastic layer over the fabric, adds several more degrees. Vent it on sunny days above 45F or you will cook the plants.
• Heavy mulch around the crowns, 4 to 6 inches of straw or leaves, protects the roots and the lowest buds.
• Plant size matters. A plant that reaches 12 to 15 inches before hard cold overwinters far better than a seedling. Sow the overwintering crop 6 to 8 weeks before your first frost.

The real prize comes in late winter. As soon as day length increases, overwintered kale pushes a flush of new leaves weeks before anything else can be sown, and those leaves are the sweetest the plant will ever make. You get 3 to 5 weeks of harvest in the hungry gap. Then the plant bolts and sends up a flower stalk. Eat the buds like sprouting broccoli, because they are excellent, then pull it and use the bed.

Kale Pests and How to Handle Them

Three pests account for nearly all kale problems. Work through controls in order, and reach for a spray last.

Cabbage worms. The velvety green caterpillars from white cabbage butterflies, plus cabbage loopers. They chew ragged holes and leave dark green droppings. Controls in order:

1. Cultural. Grow the fall crop instead of a summer one, since butterfly numbers crash as nights cool. Let dill, alyssum, or cilantro flower nearby to feed parasitic wasps.
2. Physical. Floating row cover from the day you plant, sealed at the soil edge, is the single most effective step. Kale needs no pollination, so the cover can stay on all season. Back it with a hand-picking pass every few days, checking leaf undersides for the tiny yellow eggs.
3. Biological. Encourage the parasitic wasps and the ground beetles already present, and consider a biological caterpillar control labeled for the job.
4. Chemical. Only if the first three fail. Choose a product whose label lists both the pest and kale, and follow the label exactly, including the days-to-harvest interval. The label is the law.

Aphids. Gray cabbage aphids cluster in the growing tip and in leaf crinkles, where they are hard to wash out. They multiply fastest on soft, over-fertilized growth in dry weather. Start with a hard water spray, remove and bin the worst-infested tips, ease off high-nitrogen feeding, and give plants enough space for airflow. Ladybug and lacewing larvae clear light infestations on their own if you leave them alone. Our full guide on how to get rid of aphids walks through the escalation.

Flea beetles. Tiny black beetles that pepper leaves with shot holes. Mature kale outgrows the damage and it's cosmetic, but seedlings can be killed outright. Row cover from sowing solves it. So does timing, since flea beetle pressure is worst in spring and early summer and mild in fall. Keep seedlings watered, because stressed plants take far more damage.

A Worked Example: Fall Kale in Zone 6

Say your first fall frost date is October 20, and you have a 4 by 8 foot bed to give to kale.

Count back for sowing. A full-size curly kale takes about 60 days from transplant. For a good-sized plant before hard cold, count back 10 to 12 weeks from October 20, which puts sowing around late July, call it July 27. Look up your own date with our frost dates tool.

Start in cells. Sow into 3 inch pots in bright shade on July 27. Transplant 4 weeks later, around August 24, watering in well.

Plant count. At 18 inches in-row and 24 inches between rows, an 8 foot length fits 5 plants per row and the 4 foot width fits 2 rows. That's 10 plants in 32 square feet.

Feeding. Compost worked in before planting, then a nitrogen side dressing around September 21.

Water. 1.25 inches per week over 32 square feet is about 25 gallons, split into two deep waterings.

First harvest. Baby leaves thinned off around September 20. First real bottom-up picking from about October 5, taking 4 leaves per plant.

The good stuff. After the October 20 frost, and again after the first hard frost in early November, flavor changes noticeably. From late October through December, 10 plants give roughly 2 to 3 pounds of leaf per week if you pick every 5 to 7 days.

Cover. Row cover on hoops from November 10 keeps harvest going into January in Zone 6, and the plants come back for a late February flush.

Total from that one bed: roughly 25 to 35 pounds of kale across the season, from a single seed packet that will still have seed left in it.

FAQ

Does kale really taste better after a frost?

Yes, and the change is easy to taste. Cold triggers the plant to convert stored starch into sugars that act as antifreeze in the cells, so leaves picked after two or three nights at or below 28F are noticeably sweeter and less sharp. This is the main reason a fall crop beats a spring one.

Why is my kale bitter?

Heat and drought stress, almost always. Kale grown through summer builds up the sharp compounds that give it its edge, and it never gets the cold signal that produces sugar. Water deeply and consistently, provide afternoon shade in hot climates, harvest young leaves rather than old tough ones, and sow a fall crop instead of fighting a summer one.

How do I harvest kale so it keeps growing?

Take the oldest leaves from the bottom of the plant, 3 to 5 at a time, cutting close to the main stem and leaving at least 6 to 8 leaves at the top. Never cut the central growing tip, because it's the only growing point the plant has and removing it ends production for good. Picked this way, one plant can produce for 6 months.

How far apart should kale be planted?

Twelve to 18 inches apart with 18 to 24 inches between rows for full-size plants, and 18 inches gives the biggest leaves and the best airflow. For a baby leaf patch, sow thickly at about 1 inch apart and cut the whole stand at 3 to 4 inches tall instead of thinning. In pots, allow 3 to 5 gallons per full-size plant.

Will kale survive winter outside?

In Zone 7 and warmer, usually yes with no protection, and you keep picking through the cold months. In Zones 3 to 6, established plants need a low tunnel of row cover plus 4 to 6 inches of mulch over the crowns, and they go semi-dormant rather than growing. Plants that reach 12 to 15 inches before hard cold overwinter far better than small ones.

Which kale variety is best for eating raw?

Red Russian is the most tender raw, with soft flat leaves and a thin midrib, and lacinato is a close second. Curly types have firm ruffled leaves that hold dressing well but need massaging with oil and salt to soften. Ornamental kale is edible but bitter and coarse, so grow it for color rather than for salad.

When should I plant kale for a fall harvest?

Sow 10 to 12 weeks before your average first fall frost for a full-size crop, or 6 to 8 weeks before if you're aiming to overwinter smaller plants. In midsummer heat, start seed in cells in bright shade rather than direct sowing, since hot dry soil gives patchy germination. Transplant at 4 to 5 weeks old with 4 true leaves.

What's eating holes in my kale leaves?

Ragged holes with dark green droppings mean cabbage worms, and a fine peppering of tiny shot holes means flea beetles. Floating row cover installed at planting and sealed at the soil edge stops both, and kale needs no pollination so the cover can stay on all season. Hand pick caterpillars and check leaf undersides for small yellow eggs every few days.

Updated August 2026

A note on numbers. This page gives you spacings, days to maturity, frost dates and yields, not dollar figures. Seed, row cover and compost are priced by your region and your supplier, and we do not set any of it. Every number here is one you count in the bed, not one you pay.