Winter gardening is the practice of keeping the garden alive and productive through the coldest months — growing hardy crops under cover, protecting plants from frost, storing the harvest, and using the quiet season to plan for spring. It is the season most gardeners write off, and it is the season with the most to gain: fresh leaves in January taste better for being unexpected, and a garden that is tended through winter starts spring weeks ahead of one that was abandoned in fall. This guide covers what to grow in winter, how to protect it, how to store the harvest, and what to do in the garden when the ground is frozen.
The first thing to understand is that winter gardening is mostly about protection, not about fighting the cold outright. A few degrees of protection — from a row cover, a cold frame, or a mulch layer — is often the difference between a plant that survives and one that does not. The second thing is that growth slows dramatically in winter: plants that are well grown before the cold arrives will hold and can be harvested over weeks, but little new growth happens in the darkest weeks. That is why the work of winter gardening is mostly done in fall, when the winter crops are sown and protected.
What to grow in winter
In cold climates, the winter garden belongs to hardy leaves: spinach, kale, lettuce, and Asian greens such as mizuna and tatsoi survive cold well, especially under cover, and can be harvested a few leaves at a time through winter. See our growing kale, growing lettuce, and growing spinach guides for these crops. Hardy roots such as carrots, parsnips, and leeks can be left in the ground under a thick mulch and dug as needed, provided the ground does not freeze solid. Garlic planted in fall grows roots through winter and gives the earliest harvests of the next year.
In mild climates, winter is a generous growing season: most cool-season crops grow well, and even some warm-season crops continue. In frost-free zones 11–13, winter is year-round gardening at its easiest, with cool-season crops thriving in the mild weather. Check your zone pages in our planting calendar for what to plant each month in your zone, and use our frost date calculator to understand your frost dates — remembering they are averages, so frost can arrive earlier or later in any given year.
Cold frames, row covers, and mulching
The three tools that matter most in winter are the cold frame, the row cover, and mulch. A cold frame — a bottomless box with a transparent lid, set over a bed — traps the sun's warmth, keeps frost off, and can keep salads growing weeks longer than the open garden. A row cover is a sheet of horticultural fleece or fabric laid over hoops or directly on the crop, giving a few degrees of frost protection with almost no cost. Mulch insulates the soil, keeping roots warmer and preventing the freeze-thaw cycles that heave plants out of the ground. See our season extension guide for these tools in detail, and our fall frost protection guide for protecting plants as the cold arrives.
Ventilation matters even in winter: on sunny days, a closed cold frame can overheat, so lift the lid on mild days to let in air and prevent disease. Water sparingly, since plants use little water in cold weather and wet soil freezes harder than damp soil. And keep the covers on at night and during frosts, when they do their work.
Protecting plants from frost
Frost damages plants by freezing the water inside their cells, and the damage is worst when a frost follows a mild, damp day, or when the sun hits frozen leaves in the morning. The simplest protection is to cover vulnerable plants before nightfall with fleece, old sheets, or a cold frame lid, and to remove the covers in the morning so the plants can breathe. Watering the soil before a frost can help, since damp soil holds warmth better than dry soil, but do not wet the leaves. Mulch around the base of perennials and shrubs to protect their roots, and wrap tender shrubs in fleece or burlap where hard frosts are expected.
Tender plants that cannot survive your winter — such as many herbs, dahlias, and container plants — should be brought indoors or into a frost-free shed before the first hard frost. See our overwintering plants guide for keeping plants alive through the cold. If you are unsure about frost timing or protection for your area, check your local extension service.
Storing the harvest and eating through winter
Much of winter eating comes from what you stored in fall: roots in a cool store, squash on a shelf, onions and garlic in nets, and vegetables in the freezer or in jars. See our harvest storage, freezing vegetables, and canning vegetables guides — remembering that canning must follow a tested recipe exactly, and low-acid vegetables need pressure canning. Check stored produce regularly through winter, removing anything soft or rotting before it spreads, and use the oldest stores first.
Winter is also the time to eat from the garden in small, fresh amounts: a handful of spinach from the cold frame, a leek dug from under mulch, a few kale leaves for soup. Those small harvests are the reward for the fall work, and they keep the kitchen connected to the garden through the darkest months.
Winter jobs and planning for spring
Winter is the planning season. Read your garden journal, review what worked and what failed, and plan next year's beds, rotations, and sowings. Order seed early, before the best varieties sell out. Maintain tools: clean, oil, and sharpen them, and repair cold frames, cloches, and greenhouses while the garden is quiet. Prune fruit trees and shrubs while they are dormant, if that suits the species, and check stored bulbs and tubers. Feed the soil on empty beds with compost and mulch, and sow cover crops where the ground will rest — see our cover crops for soil guide. In frost-free zones 11–13, winter is a working growing season rather than a planning one, so keep sowing and harvesting as usual.
Common mistakes
The most common mistake is sowing winter crops too late in fall, so they are too small to survive the cold. The second is forgetting ventilation, so a closed cold frame overheats on a sunny day or grows mould. The third is leaving tender plants out until the first hard frost, when it is too late. The fourth is watering too much in cold weather, so the soil stays wet and freezes hard. The fifth is abandoning the garden entirely in winter, so spring starts from a standing start. Sow in time, ventilate on sunny days, bring tender plants in early, water sparingly, and use winter to plan.
Frequently asked questions
What can I harvest in winter in a cold climate?
Hardy leaves such as spinach, kale, and lettuce grown under cover, roots left in the ground under mulch, leeks, and stored produce — roots, squash, onions, and frozen or canned vegetables from the fall harvest.
Do I need a greenhouse to garden in winter?
No. A cold frame and row covers are enough to grow salads through winter in many climates, and a greenhouse is a later step if you want more. Start with the simple tools first.
How do I stop my cold frame overheating in winter?
Lift or prop the lid open on sunny, mild days, and close it before nightfall. Even in winter, a closed cold frame in full sun can get hot enough to stress plants.
Should I water in winter?
Water sparingly, since plants use little water in cold weather. Water on mild days, in the morning, so the soil is damp rather than wet before nightfall, and avoid wetting the leaves.
What grows in winter in frost-free zones 11–13?
In zones 11–13, which are frost-free, winter is a full growing season: cool-season crops such as lettuce, kale, spinach, and carrots thrive in the mild weather, and many warm-season crops continue. If you are unsure what to plant in your zone, check your local extension service and your zone pages in our planting calendar.