Yes, you can. Growing kale in winter works in most regions, though how far you push it depends on your climate. Kale is one of the toughest greens you can put in the ground, and the cold often makes it taste better, not worse.
Last December I pulled crisp, sweet Lacinato leaves from the zone 6 raised bed by my back fence after a light snow had dusted the row. I planted that crop in early September, about six weeks before our first frost, and it sat there shrugging off cold night after cold night. Each leaf snapped clean and tasted noticeably sweeter than the same plants in summer. The chill turns starch into sugar, so the harshest weather gave me my best greens.
That sweetness is the plant's own answer to frost. Cold hardy kale builds up sugars in its leaves as a kind of antifreeze, which protects the cells and gives you a milder, richer flavor. The bitterness you taste in summer kale fades once real cold arrives. Most other salad greens turn to mush at the first hard freeze. Kale leans into it instead, which is why it has fed gardeners through winter for centuries.
Think of frost as a free seasoning. A summer-grown leaf can taste sharp and a little tough, fine for cooking but harsh raw. The same plant after a cold snap turns tender and almost mild. I have eaten winter kale straight from the bed with no dressing at all, and it held its own. That shift in taste is the main reason I keep a fall bed going every year.
The numbers back this up. Utah State notes that young plants handle temperatures down to about 25°F (-4°C) without serious harm. Mature plants are even tougher and shrug off cold well past that mark. Frost also improves the flavor of a fall-planted crop. So a few cold snaps are not a threat to your bed. They are part of the plan.
Variety matters here too. Lacinato, Winterbor, and Red Russian all hold up well once the temperature drops. These types stay productive when summer kale would have bolted or burned out months ago. Winterbor in particular was bred for cold and keeps its tight curl through hard frost. Pick one of these for a fall sowing and you stack the odds in your favor before the first frost even arrives.
How much winter harvest you get comes down to your zone. In roughly zones 7 to 10, kale can keep producing fresh leaves straight through the cold months with little fuss. In colder areas the plants slow down or go dormant, but they often survive and bounce back in spring. A simple cold frame or row cover makes a real difference for overwintering kale in those harsher spots. The cover traps a few degrees of warmth and blocks the drying wind that does most of the damage. Even an old bedsheet thrown over the bed on a bad night can save your crop.
Here is how to set yourself up. Plant a fall crop about six weeks before your first frost so the plants size up before the days get short. Water them in well and give them sun while the weather is still mild. Once cold weather settles in, drape a row cover or close a cold frame on the worst nights to buy a few extra degrees. Harvest the outer leaves and leave the center to keep growing. The plant will push out new leaves from the middle as long as it stays alive. Do that, and you can pull fresh greens from your garden long after everything else has given up.
Read the full article: Kale Plant Guide: Grow, Harvest and Enjoy
