Here in Maine, winter isn't something we tiptoe around. It shapes how we garden all year. The good news is that the steps that carry a garden through a long northern winter work just about anywhere. Whether your ground freezes solid in November or you only see a handful of frosty nights, a little care this fall pays off with healthier soil, stronger plants and an easier start next spring.
Use this checklist as a guide, and adjust the timing to your own climate. We've added notes for warmer regions along the way.
1. Get oriented: know your zone and your frost date
Every item on this list depends on timing, so start by figuring out where you stand. Look up your zone on the USDA Plant Hardiness Zone Map. It was updated in 2023, and many gardeners moved half a zone warmer, so it's worth checking again even if you think you know yours. Then find your average first frost date. The Old Farmer's Almanac frost date calculator gives a good estimate by zip code.
Two terms are worth knowing:
- Light frost (around 29–32°F) damages tender plants like basil, tomatoes and peppers.
- Hard or killing frost (28°F and below for several hours) ends the season for most annuals and signals that perennials are heading into dormancy.
Many of the tasks below are best done after the first hard frost, not on a set date. Keep in mind that frost dates are averages. A weather app and a cheap outdoor thermometer will tell you more about this year than any chart.
Warmer regions (zones 8–10): Your "winter" may be your second growing season. Use your frost date to plan cool-season crops like lettuce, kale and garlic, not just cleanup.
2. Bring in the last harvest and reflect on the season
Pick everything tender before the first frost: tomatoes, peppers, squash, beans and basil. Green tomatoes will ripen indoors on a counter or in a paper bag. Hardy crops like kale, Brussels sprouts, carrots and parsnips can stay out longer, and a few light frosts actually make them sweeter as the plants convert starches to sugars.
Then take a few minutes with your garden journal while the season is still fresh. A few notes now will make next year's planning much easier:
- What thrived, what struggled, and which varieties you'd grow again
- Where pests or diseases showed up, so you can rotate crops away from those spots
- Planting and harvest dates, so you can fine-tune timing next year
- A rough sketch of your beds and what grew where
Don't have a journal? Photos on your phone with a quick caption work just as well.
3. Pot up herbs and bring them indoors
Many herbs will keep producing on a sunny windowsill all winter. The best candidates are rosemary, parsley, chives, thyme, oregano and mint. Basil is better started from cuttings: snip 4-inch stems, root them in a glass of water, then pot them up.
- Dig before frost. Lift plants with plenty of root and pot them in fresh potting mix, not garden soil. Garden soil compacts in containers and drains poorly.
- Check for hitchhikers. Rinse foliage and look under leaves for aphids, whiteflies and spider mites before anything comes inside.
- Ease the transition. Keep pots in a shady spot outside for a week before moving them in, so the plants adjust to lower light.
- Give them light. A south-facing window with at least 6 hours of sun is ideal. A small grow light helps a lot in northern winters.
- Go easy on water. Indoor herbs need less than you'd think. Let the top inch of soil dry between waterings.
Warmer regions: Most of these herbs will overwinter outside. A light mulch and a frost cloth for cold snaps is usually enough.
4. Feed your soil and put your beds to bed
Fall is the best time of year to build soil. Spread 2–3 inches of quality compost over your beds after you clear them. Over the winter, rain, snow and freeze-thaw cycles work it into the soil, and soil life keeps breaking it down whenever the ground isn't frozen. By spring, your beds are richer, better drained and ready to plant.
Then cover the compost with 3–4 inches of shredded leaves or straw (not hay, which carries weed seed). This top layer:
- Protects bare soil from erosion by wind, rain and snowmelt
- Keeps nutrients from washing out
- Suppresses early weeds in spring
- Feeds earthworms and soil microbes as it breaks down
Before you mulch, clean up wisely. Remove and trash (don't compost) any plants that had disease, like tomato blight or powdery mildew, so the problem doesn't overwinter in your beds. Healthy plant material can go in the compost pile. This is also a great time to take a soil test through your local cooperative extension office, since amendments like lime work best with months to act.
Try a cover crop
Instead of mulch, you can grow a living cover. Cover crops hold soil in place, add organic matter when you turn them under, and some even add nitrogen.
- Winter rye is the toughest choice for cold climates. It germinates in cool soil and can be sown up to about 4 weeks before the ground freezes.
- Clover (crimson clover in milder areas) adds nitrogen but needs to go in earlier, about 6–8 weeks before your first frost.
- Oats grow quickly in fall, then die over a cold winter, leaving an easy mulch to plant through in spring.
In spring, cut the cover crop down and turn it in or leave it as mulch, about 2–3 weeks before planting.
Warmer regions: Cover crops are an especially good fit where beds sit empty through a mild winter. Crimson clover, rye and vetch all grow well.
5. Help your berry bushes through winter
A light cleanup and a good layer of mulch help berry plants survive the cold and come back strong.
- Blueberries: In fall, only remove dead, broken or diseased canes. Save the real pruning for late winter, when the plants are fully dormant and you can see the structure clearly. Pull 2–4 inches of mulch around the base (pine needles or shredded bark work well and help keep the soil acidic), leaving a few inches clear around the stems.
- Raspberries and blackberries: For summer-bearing types, cut the canes that fruited this year down to the ground. They won't fruit again. Leave the new green canes for next summer's crop.
- Strawberries: Wait until plants are dormant, usually after a few nights in the low 20s°F, then cover them with 3–4 inches of loose straw. Mulching too early can trap heat and cause rot. Pull the straw back in spring once new growth starts, and keep it nearby in case of a late frost.
Warmer regions: Strawberries usually need little or no winter straw. Blueberries benefit from mulch year-round to hold moisture.
6. Perennial flowers: know what to cut and what to leave
Perennials are a blessing and a curse in fall. Some benefit from being cut back, while others are better left standing until spring. A good rule of thumb:
- Cut back plants that had disease or pest problems (like peonies prone to botrytis, or bee balm and phlox with powdery mildew), plus plants that turn to mush after frost, such as hostas and daylilies.
- Leave standing sturdy plants with seed heads and hollow stems, like coneflower, black-eyed Susan, sedum and ornamental grasses. They feed birds, shelter overwintering native bees and beneficial insects, catch insulating snow and look beautiful in the frost.
We've linked a helpful guide on which perennials to cut back and which to leave alone.
After the ground freezes, add a few inches of mulch over newly planted or borderline-hardy perennials. The goal isn't to keep them warm, but to keep the soil evenly frozen. Repeated freeze-thaw cycles can push plants right out of the ground (called frost heave).
7. Help the birds
Winter is hard on birds. Natural food is scarce, and they burn a lot of energy just staying warm on cold nights. Birds that stick around your yard through winter become some of your best garden helpers come spring, eating caterpillars, beetles, aphids and other pests while they raise their young.
- Offer energy-dense food. Black oil sunflower seed, suet, peanuts (unsalted) and nyjer seed are high in fat and attract the widest range of birds. Skip cheap mixes heavy in milo or red millet, which many birds kick to the ground.
- Keep feeders clean. Scrub them every couple of weeks with a mild bleach solution (1 part bleach to 9 parts water) to prevent disease, and rinse well.
- Provide water. A heated birdbath is one of the most valuable things you can offer in freezing weather.
- Leave some cover. Brush piles, evergreens and those standing perennials from step 6 give birds shelter and natural food.
Critter Note: In bear country, take feeders down from early spring through late fall, when bears are active.
8. Drain and store your irrigation
Water left in hoses, drip lines and spigots expands when it freezes, which can split hoses, crack fittings and burst pipes. Even where freezes are rare, putting irrigation away for the off-season helps it last longer.
- Disconnect and drain hoses. Stretch them out on a slope or walk the water out end to end, then coil loosely and store them in a garage or shed. Sunlight and cold both break down rubber and vinyl.
- Clear drip lines. Open the end caps and let them drain, or blow them out with low-pressure air. Pull up and store lines from annual beds. Bring filters, timers and pressure regulators indoors, since they crack easily.
- Protect outdoor faucets. Shut off the indoor valve that feeds each spigot if you have one, open the outdoor faucet to drain it, and add an insulated faucet cover.
- Store dry. Let everything dry fully before storage to prevent mold, mildew and rot.
Warmer regions: If you water through winter, keep frost covers on hand for faucets and backflow preventers during cold snaps.
9. Clean, sharpen and oil your tools
Well-kept tools last for decades. Putting them away dirty invites rust and can carry soil-borne diseases into next season.
- Clean. Knock off dried soil, then scrub metal with a wire brush and water. Remove rust with steel wool or sandpaper.
- Disinfect. Wipe pruners, shears and loppers with rubbing alcohol (70% or higher), especially if they touched diseased plants.
- Sharpen. Use a mill file or whetstone to restore the edge on shovels, spades and hoes, and a fine sharpening stone on pruners and shears. Follow the original angle of the bevel.
- Oil. Coat metal surfaces with a light oil to prevent rust, and put a few drops on pivots, springs and other moving parts.
- Care for handles. Lightly sand rough wooden handles and rub in boiled linseed oil to keep them from cracking.
- Store dry. Hang tools off the floor in a dry shed or garage.
A bucket of sand mixed with a little oil is an old trick for quick cleaning: plunge your shovel or trowel in a few times after each use.
It's also a good time to service power equipment. Run the mower or tiller dry of fuel, or add fuel stabilizer, and sharpen the mower blade so it's ready for spring.
10. Clean out the greenhouse and containers
Pests and diseases love to overwinter in old pots, trays and greenhouse corners. A deep clean now means seedlings start next spring in a healthy space.
- Empty containers. Spent potting mix from healthy plants can go into the compost pile or be spread on garden beds. Throw away mix from plants that had disease. Next spring, refresh your containers with new potting soil blended with compost.
- Scrub and sanitize. Wash pots, seed trays and flats with soapy water to remove residue, then soak them for 10 minutes in a 1:9 bleach-to-water solution and rinse well.
- Protect breakables. Terra cotta and ceramic pots absorb water and can crack in freezing weather. Store them indoors or upside down under cover.
- Greenhouse: Clear out plant debris and weeds, then wash benches, walls and glazing. Clean glazing lets in as much light as possible during short winter days. Check vents, doors and heaters before the coldest weather arrives.
Rest up for spring
Once your beds are tucked in and your tools are put away, give yourself some credit. Winter is a natural pause for the garden, and for the gardener. Use the quiet months to page through seed catalogs, look over your garden journal and dream up next year's plans. Your soil will be working quietly underneath the snow (or the mulch), getting ready for spring.
