Tomato plants cannot survive a hard freeze, so your choice in winter is whether to end them or move them indoors

Once the first frost arrives—typically between late September and November depending on where you live—outdoor tomato plants will die. The plant tissue collapses when exposed to temperatures below 32°F. You have three practical paths: pull the plants and compost them, dig them up and move them to a sheltered indoor space, or harvest all remaining fruit and let the plants go. Which one makes sense depends on how much space you have, whether you want to extend your harvest, and how much effort you're willing to spend.

The timing matters. Check your local first frost date before you act. If frost is forecast within a few days, you can still salvage green tomatoes by picking them now—they will ripen indoors over several weeks. If frost has already hit and blackened the leaves, the plant is done and pulling it is your only option.

Key Takeaways

  • Tomato plants die when exposed to frost, so you must act before the first freeze arrives in your area.
  • You can harvest all remaining fruit (ripe or green) and pull the plant, dig up the whole plant to move indoors, or compost it where it stands.
  • Green tomatoes picked before frost will ripen indoors at room temperature over two to four weeks if stored in a paper bag or cardboard box.
  • If you move a plant indoors, place it in the brightest window available and expect slower growth and fewer new fruits than it produced outside.
  • Pulling plants and composting them is the simplest option and clears space for fall or spring planting.

Harvesting and composting: the simplest end-of-season choice

The most straightforward approach is to pick all usable fruit, then pull the plant and add it to your compost pile. Walk through your tomato bed and pick every ripe tomato and every green tomato that has reached full size—even if it's still pale green, it will ripen off the vine. Leave only the tiny marble-sized fruits on the vine; they won't mature in time.

Once you've harvested, grasp the plant at the base and pull it straight up. The roots will come free from the soil. Shake off excess dirt and lay the entire plant (stems, leaves, roots) in your compost bin. Tomato plants break down readily and add nitrogen-rich material. Do not compost diseased plants—if the plant shows signs of blight, powdery mildew, or other disease, throw it in the trash instead so you don't spread the problem to next year's garden.

This method takes an afternoon and leaves your bed clear for fall crops (like lettuce or spinach in mild climates) or for winter mulching and spring preparation.

Moving plants indoors to extend the harvest

If you have a sunny window or grow lights, you can dig up a tomato plant and move it indoors to keep it alive through winter. This works best with determinate varieties (bush types) and with plants that are still healthy and producing when frost approaches. Indeterminate varieties (vining types) can survive indoors but often grow leggy and produce fewer fruits because indoor light is weaker than outdoor sun.

Dig around the plant's base with a shovel, going at least 12 inches out from the stem to avoid cutting the root ball. Lift the entire root mass and place it in a large pot—at least 5 gallons—filled with potting soil. Water it well and let it drain. Place the pot in your brightest window, ideally one that faces south or west. If natural light is limited, position a grow light 6 to 12 inches above the plant and run it for 12 to 14 hours per day.

Indoors, the plant will grow more slowly and may drop some leaves as it adjusts. Pinch off any flowers that appear in the first week or two—the plant needs to focus energy on root establishment, not fruit production. After two weeks, you can allow new flowers to develop. Expect fewer tomatoes than the plant produced outside, and expect them to ripen more slowly because indoor light is less intense. Water when the top inch of soil feels dry, and do not fertilize heavily—a light feeding once a month is enough.

Ripening green tomatoes indoors

You do not need to keep the whole plant alive to ripen green tomatoes. Pick all full-sized green tomatoes before the first frost, then ripen them indoors in a warm, dark place. This is faster and simpler than maintaining a living plant.

Place the green tomatoes in a single layer inside a paper bag, cardboard box, or plastic container with the lid slightly ajar. Keep them at room temperature—between 65°F and 75°F is ideal. Do not refrigerate; cold slows ripening. In a warm room, green tomatoes will turn color in two to four weeks. Check them every few days and remove any that show soft spots or mold. Once a tomato shows color, you can move it to a sunny windowsill to finish ripening and develop more flavor.

Tomatoes ripened this way will be less flavorful than those that ripened on the vine in full sun, but they are still usable for cooking and sauces. Tomatoes picked very late in the season—when the plant is already stressed—may not ripen at all indoors; they will stay pale and eventually rot. Pick fruit while the plant is still healthy for the best results.

Preparing the soil for next year

Once you've removed the plants, your tomato bed is ready for winter preparation. Pull any remaining weeds and debris. If you're in a cold climate where the ground freezes, spread 2 to 3 inches of compost or aged manure over the bed and let it sit through winter. Frost and thaw cycles will break it down, and by spring it will have worked into the soil, improving structure and adding nutrients.

If you're in a mild climate where you can plant fall or winter crops, do that now. Lettuce, spinach, kale, and other cool-season greens can be planted in late fall and harvested before spring. This keeps the soil covered and productive instead of bare.

If disease was a problem this year—early blight, late blight, or septoria leaf spot—avoid planting tomatoes in the same spot next year. Rotate to a different bed or area of the garden. These diseases overwinter in soil and plant debris, so moving your crop breaks the cycle.

Storing tomatoes after harvest

Ripe tomatoes picked in late fall should not be refrigerated, even if you're storing them for a few days. Cold temperatures damage the flavor and texture. Keep them at room temperature on a counter or shelf, away from direct sunlight. They will keep for three to five days this way.

If you have a large harvest and want to preserve tomatoes for winter use, consider canning, freezing, or making sauce. Canning requires sterilized jars and a pressure canner (for safety), and it's a multi-step process. Freezing is simpler: wash the tomatoes, cut them in half, and freeze them on a baking sheet, then transfer to freezer bags. Frozen tomatoes work well in soups, stews, and sauces but will be soft when thawed, so don't use them for fresh eating.

Dealing with pests and disease before winter

Before you compost or move a plant indoors, inspect it for pests and disease. Whiteflies, spider mites, and aphids can survive indoors and spread to other houseplants. If you see insects on the plant, spray it with insecticidal soap or neem oil according to the label, and let it dry completely before bringing it inside. Check the plant again after a few days and spray again if needed.

If the plant shows signs of fungal disease—brown or black spots on leaves, powdery coating, or wilting despite moist soil—do not move it indoors. Diseases like early blight and powdery mildew spread rapidly in the warm, still air of a house. Pull the plant and compost it (or trash it if the disease is severe). The effort to save one plant is not worth infecting your entire indoor garden.

Frequently Asked Questions

Can I save tomato seeds from my plants before winter?

Yes. Let a ripe tomato fully mature on the vine, then pick it and let it sit at room temperature for a few days until it's very soft. Cut it open, scoop the seeds and gel into a strainer, rinse under running water to remove the gel, and spread the seeds on a paper towel to dry completely (one to two weeks). Store dry seeds in a paper envelope in a cool, dark place. They will stay viable for three to four years.

Will green tomatoes ripen if I leave them on a pulled plant?

No. Once the plant is pulled from the ground, it stops sending energy to the fruit. Pick the tomatoes off the vine and ripen them indoors instead. Tomatoes left on a dead plant will stay green and eventually rot.

What temperature kills a tomato plant?

Tomato plants die when exposed to frost—temperatures at or below 32°F. A light frost (32°F to 28°F) will kill the leaves and soft stems but may not kill the roots when ready. A hard freeze (below 28°F) kills the entire plant. Check your local first frost date to know when to act.

Can I grow tomatoes indoors year-round?

You can keep a tomato plant alive indoors through winter, but it will grow slowly and produce fewer fruits than it did outside because indoor light is weaker. In spring, you can move it back outside or start fresh plants from seed. Most home gardeners find it simpler to end the plant in fall and start new ones in spring.

Should I prune the plant before moving it indoors?

Light pruning is fine—remove any dead or diseased leaves and cut back long, leggy stems to encourage bushier growth. Do not remove more than one-third of the plant at once. Avoid heavy pruning right after moving indoors; let the plant adjust for a week or two first.