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After a productive tomato growing season, it’s hard to watch your tomato plants die back with frost.
But, here's a gardener's secret: if you have the right tools and a little space, you can keep tomato plants alive through winter and enjoy your favorite tomatoes for years to come.
To get you started, here are 3 easy techniques for overwintering tomato plants indoors or out in your garden, plus a selection of my favorite cold hardy tomato varieties for chilly weather.
Can You Grow Tomatoes Year-Round?
Tomatoes are heat-loving plants that grow perennially in zones 10 and up. But in chillier locations, these plants are typically cultivated as annuals and replaced with new tomato plants each spring.
However, if you’re open to overwintering tomato plants indoors, you can keep tomatoes growing year-round in any climate.
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Can You Overwinter Tomato Plants?
Yes! While many gardeners pull up their tomato plants in fall, tomatoes can be overwintered outdoors in zones 10 and up or in homes or heated greenhouses in colder locations.
In fact, tomatoes are surprisingly easy to overwinter indoors and they have many of the same care needs as tropical houseplants.
Overwintering Options for Tomatoes
Growers have several options when it comes to overwintering tomatoes. Tomatoes can either be overwintered outdoors with season extension products, or they can be overwintered inside as potted plants or cuttings.
Which method you choose to use will depend on your growing zone and how much space you have for growing tomatoes.
How to Overwinter Tomatoes Indoors
Overwintering potted tomatoes indoors or in a greenhouse takes a bit more work, but it’s the only overwintering option that may allow you to harvest tomatoes year-round.
Prepare Your Tomatoes
Prepping tomatoes for overwintering begins in late summer to early fall. Carefully inspect your plants for signs of pests and disease and select only the healthiest plants for overwintering.
Continue to water these plants regularly until you move them indoors, but stop fertilizing them in late summer.
Prune Carefully
Smaller tomato plants are easier to move indoors, so pick up your sterilized pruners and carefully prune away extra stems, suckers, and damaged leaves.
Larger plants should be pruned back a bit more severely so that you’re left with about 1 to 2 feet of the plant’s main stem and a few healthy branches. You can also prune away any lingering fruit and flowers to help your plants transition more easily to indoor living.
Pot (or Repot) Plants
If you want to overwinter tomatoes in your garden, you’ll need to transplant them into roomy and well-draining planters that are at least 14 inches in diameter.
To start, carefully dig up tomatoes before frost arrives, and make sure to leave as much of the plant’s roots attached as possible.
Plant your tomatoes in pots filled with a well-draining potting mix and water them in.
If you’re growing larger tomato plants and plan to harvest fruit indoors, you may want to add a small trellis or stake to your pot at this time to support your plants as they grow.
Acclimate Tomatoes Indoors
Before bringing your tomatoes indoors for good, check your plants carefully for pests and slowly acclimate your plants to your home or greenhouse by moving them inside for just a few hours each day.
Continue this process over the next week or two, gradually extending the amount of time your plants spend indoors until they’re fully acclimated to the temperatures and light levels of indoor life.
Provide Indoor Plants with the Right Care
Place plants in front of a sunny window or under a grow light and water them regularly to keep the soil from drying out.
Bright windows and temperatures that are above freezing should be sufficient for keeping tomato plants alive through winter.
Provide your plants with warmer temperatures, monthly fertilizer, and a grow light if you want to grow tomatoes.
Pruning off the fruit, flowers, and wayward stems keeps tomato plants healthier through winter.
Hand-pollinate the flowers if you want your plants to fruit.
Transplant Tomatoes Outdoors Come Spring.
When spring returns and temperatures are consistently above 55 degrees Fahrenheit, harden off your plants over a week or two by moving them outdoors during the day and inside at night.
When your plants can tolerate full sun and outdoor weather, position their pots in a sunny spot or transplant them back into your veggie beds. Soon enough, you’ll be harvesting more tomatoes from your overwintered plants.
How to Overwinter Outdoors
While cool weather gardeners need to overwinter tomato plants indoors, gardeners in USDA growing zones 10 and up can overwinter tomatoes right in their gardens.
This method works for both potted tomatoes and tomatoes in inground and raised beds, although potted plants may need a little more insulation. For best results, choose cold-hardy tomato varieties for overwintering.
Prepare your plants: To get your tomatoes ready for winter, stop fertilizing your plants in late summer to early fall, but continue to water your plants regularly.
Do some pruning: Before temperatures dip, prune away any new growth on your tomatoes and cut your plants back so that you’re left with just a foot or two of the plant’s main stems.
Insulate your tomatoes: Add a 2 to 3-inch layer of natural mulch around the base of your plants to protect the roots from cold.
Uncover plants in spring. When spring returns and the danger of frost has passed, go ahead and uncover your plants, rake away excess mulch, and start tending your tomatoes as usual!
How to Overwinter With Cuttings
If you don’t want to overwinter entire tomato plants, you can propagate your favorite tomatoes from stem cuttings or tomato suckers. This technique is a great space saver and can also help you salvage tomato plants damaged during the growing season.
Take your cuttings: Before frost arrives, head out into your garden and take 4 to 6-inch long cuttings from your tomato plants.
Propagate the cuttings in soil or water: Inspect cuttings carefully for pests, pinch off the flowers and damaged leaves, and remove any leaves that are growing from the lower portion of your cuttings.
For water propagation, fill a clear glass container with an inch or two of water and place your cuttings in the water so that the cut stem ends are fully submerged and the leaves are above the water line.
For soil propagation, dip the cut stem ends of your cuttings into rooting hormone, plant the cuttings 1 to 2 inches deep in pots filled with potting mix or seed starting mix, and cover the cuttings and pots with clear plastic bags to conserve humidity.
Care for your plants through winter. Place your cuttings in a warm spot that receives bright, indirect light, and continue to care for your cuttings for a few weeks until they root.
Transplant tomatoes outdoors in spring. Once your plants are properly hardened off, transplant them into pots or your garden beds.
Why Should You Overwinter Tomatoes?
Overwintering tomatoes is a fun experiment, but it has a few major advantages too.
By keeping tomatoes alive through winter, you can extend your growing season significantly.
You can harvest tomatoes earlier the following year.
Overwintering tomatoes can save you money.
It's a great way to preserve hard-to-find and heirloom tomatoes, as well as your favorite and most productive plants.
5 Cold-Hardy Tomato Varieties
While frost hardy tomatoes don’t exist, some tomatoes are more cold tolerant than others. If you want to extend your tomato growing season or overwinter tomatoes outdoors in mild climates, these cold tolerant tomato varieties are hard to beat!
Glacier. With an impressively long harvest season, ‘Glacier’ is one of the first tomatoes to fruit in summer and the last tomatoes to fruit in fall!
Moskvich. An early-season favorite, ‘Moskvich’ is resistant to cracking and grows well in greenhouses.
Siberian. Undeterred by the cold, ‘Siberian’ continues to fruit even when temperatures drop to 38 degrees Fahrenheit!
Sub-Arctic Plenty. One of the fastest growing heirlooms you can find, ‘Sub-Arctic Plenty’ is ready to harvest just 42 days after transplanting.
Oregon Spring. Another early producer, ‘Oregon Spring’ is resistant to verticillium wilt and produces fruit about 60 days after transplanting.



