There is a particular kind of satisfaction that comes in the middle of a grey Ontario January when you reach into the freezer and pull out a container of tomato sauce made from tomatoes you grew in your own garden last August. Or when you roast a butternut squash in November that has been sitting contentedly in your basement since October. Or when you make a pasta dish in February fragrant with dried herbs that were growing in your garden just a few months ago.
This is what food preservation is really about. Not just reducing waste or saving money, though it does both of those things well. It is about extending the connection to your garden and your growing season deep into the months when nothing is growing outside and the garden feels like a distant memory.
October is the month when that work begins in earnest. The first frost is close. The last tomatoes, squash, and root vegetables need to come in. The herb garden is at its most abundantly productive before cold ends the season. And every Ontario home gardener faces the same beautiful challenge: too much of everything all at once.
Here is a complete and practical guide to storing and preserving your fall harvest so that the work you put into your garden this season feeds you well into 2027.
Before You Preserve Anything: The Golden Rules of Food Preservation
Two principles apply across every preservation method and ignoring either one undermines everything else.
Preserve at peak quality, not past it. Preservation locks in the quality of the food at the moment it goes in. It does not improve food that is already declining. A tomato that is starting to soften and ferment will make mediocre frozen sauce no matter how well you process it. A squash with soft spots will not store well regardless of how carefully you cure it. Always start with the best quality produce you have and use anything that is past its best immediately rather than attempting to preserve it.
Match the method to the food. Different foods are suited to different preservation methods and using the wrong method for a particular food produces disappointing results at best and food safety risks at worst. This guide matches each crop to its best preservation method so you do not have to guess.
Tomatoes
Best preservation methods: Freezing, roasting and freezing, simple sauce
Tomatoes are the crop that most Ontario home gardeners have in the greatest abundance in October and the one that causes the most preservation anxiety. The good news is that tomatoes are one of the most forgiving crops to preserve, and the simplest methods produce the best results.
Freezing whole or chopped tomatoes:
The simplest possible tomato preservation method and surprisingly effective. Core ripe tomatoes, cut them into quarters or halves, spread on a parchment-lined baking sheet and freeze until solid, then transfer to freezer bags or containers. Frozen tomatoes are perfect for cooked applications including soups, stews, pasta sauces, and shakshuka throughout winter. The skins slip off easily after thawing which is a bonus rather than an extra step. Frozen tomatoes keep well for ten to twelve months in a consistently cold freezer.
Roasted tomato sauce:
Halve tomatoes, toss with olive oil, garlic, and herbs, and roast at 200 degrees Celsius for forty-five minutes to one hour until deeply caramelised and concentrated. Allow to cool, blend to a smooth or chunky sauce depending on preference, portion into freezer containers, and freeze. Roasted tomato sauce made in October from garden-fresh tomatoes is one of the most flavourful things you can pull from your freezer in February and the roasting step adds a depth of flavour that raw frozen tomatoes alone cannot provide.
A note on home canning tomatoes:
Home canning tomatoes in mason jars is a traditional and effective preservation method that produces shelf-stable jars that do not require freezer space. However canning requires specific equipment, accurate technique, and careful attention to food safety since improperly processed low-acid foods can support the growth of Clostridium botulinum. If you are new to canning, tomatoes with added lemon juice or citric acid are among the safest beginner canning projects since their acidity inhibits bacterial growth. Follow a tested recipe from a reputable source like the National Centre for Home Food Preservation rather than improvising, and invest in a proper canning guide before starting.
For beginners, freezing produces excellent results with zero food safety concerns and far less equipment and effort than canning. Start with freezing and graduate to canning once you are comfortable with the process.
Winter Squash and Pumpkins
Best preservation method: Curing and cool room storage
Winter squash including butternut, acorn, delicata, spaghetti squash, and pie pumpkins are among the easiest fall crops to preserve because they do not require any processing at all. They simply need to be cured and stored correctly and they will keep for months in the right conditions.
How to cure winter squash:
Harvest squash before the first hard frost while the vine is still partially green and the rind is firm and hard enough to resist scratching with a fingernail. Leave 5 to 8 centimetres of stem attached since stemless squash rot significantly faster in storage.
Cure harvested squash by placing them in a warm location, ideally 25 to 30 degrees Celsius, with good air circulation for ten to fourteen days. A sunny enclosed porch, a warm basement corner, or a spare bedroom works well for curing. Curing hardens the skin, heals any small surface scratches or nicks that could become entry points for rot, and converts starches to sugars that significantly improve flavour over time.
Storage after curing:
Move cured squash to a cool, dry, well-ventilated location between 10 and 15 degrees Celsius for long-term storage. A cool basement, root cellar, or insulated garage that stays consistently in this temperature range is ideal. Avoid storing squash in a refrigerator since temperatures below 10 degrees cause chilling injury that accelerates deterioration. Store squash in a single layer with space between each fruit rather than stacking since contact between fruits accelerates rot.
Properly cured and stored butternut squash keeps for three to five months. Acorn and delicata squash keep for two to three months. Spaghetti squash keeps for one to two months. Check stored squash weekly and use immediately any fruit that develops soft spots.
Garlic
Best preservation method: Curing and cool dry storage, freezing, infused oil
If you grew your own garlic this season and harvested in July, your bulbs should already be cured and stored by October. If you are storing purchased or market garlic through winter the same principles apply.
Long-term garlic storage:
Properly cured garlic, meaning bulbs that have been dried in a warm, well-ventilated location for three to four weeks after harvest until the wrappers are completely dry and papery, stores best at cool room temperature between 15 and 18 degrees Celsius with low humidity and good air circulation. A mesh bag, a woven basket, or a traditional garlic braid hung in a cool, dry pantry or basement provides ideal conditions. Avoid storing garlic in the refrigerator since the cold and moisture of a refrigerator triggers premature sprouting.
Hardneck garlic, which is the variety most Ontario home gardeners grow, keeps for four to six months under good storage conditions. Softneck varieties keep longer, up to eight to ten months, which is why softneck is the type most commonly found in grocery stores.
Freezing garlic:
Peel individual cloves and freeze in a single layer on a baking sheet before transferring to a freezer bag for long-term frozen storage. Frozen garlic cloves can go directly into cooked dishes from frozen without thawing. Alternatively, blend peeled garlic cloves with a small amount of olive oil and freeze in ice cube trays for individual portion-sized frozen garlic paste that goes directly into sauces, soups, and stir fries.
Roasted garlic:
Roast whole garlic heads in the oven until the cloves are soft, golden, and caramelised, then squeeze out the roasted cloves and freeze in small portions. Roasted garlic frozen in October from your summer harvest adds extraordinary depth to winter pasta dishes, mashed potatoes, soups, and spreads.
Root Vegetables: Carrots, Beets, and Parsnips
Best preservation method: Root cellar storage, refrigerator storage, freezing
Root vegetables are among the most storage-friendly crops in the fall garden and Ontario's cool autumn temperatures work naturally in your favour for keeping them at their best through winter.
Refrigerator storage:
Carrots, beets, and parsnips all store beautifully in the refrigerator for two to three months when stored correctly. Remove all foliage since leaves draw moisture from the root and accelerate deterioration. Store unwashed roots in perforated plastic bags or containers in the crisper drawer. Do not wash root vegetables before refrigerating since surface moisture accelerates rot. Wash immediately before use instead.
Root cellar or cool room storage:
Carrots, beets, parsnips, and turnips can be stored for four to six months in a root cellar or cool room that maintains temperatures between 0 and 4 degrees Celsius with high humidity around 90 to 95 percent. Pack washed and trimmed roots in slightly damp sand, sawdust, or peat moss in wooden crates or cardboard boxes and store in a single layer with roots not touching. Check monthly and remove any that show signs of rot.
An unheated but insulated garage, a cold room in the basement, or even an insulated corner of an unheated porch can approximate root cellar conditions in a Zone 6a Ontario home through winter.
Freezing root vegetables:
Blanching and freezing is the most convenient long-term preservation method for carrots and beets if you lack root cellar space. Peel and cut into uniform pieces, blanch in boiling water for two to three minutes, plunge immediately into ice water to stop cooking, drain thoroughly, and freeze in a single layer before transferring to freezer bags. Blanched frozen carrots and beets keep well for ten to twelve months and go directly into soups, stews, and roasted vegetable dishes from frozen.
Fresh Herbs
Best preservation methods: Freezing, drying, herb oil, herb butter
October is the last chance to harvest your herb garden before frost ends the season and the right preservation method varies significantly depending on the herb.
Freezing soft herbs:
Basil, parsley, chives, mint, and cilantro all freeze better than they dry since drying causes these high-moisture herbs to lose most of their volatile flavour compounds. The best freezing methods for soft herbs are ice cube trays with water or olive oil, which produce individual portion cubes that go directly from freezer to pan, or the flat freeze method where whole herb leaves are spread on a parchment-lined baking sheet, frozen solid, and then transferred to a labelled freezer bag. Frozen herbs are ideal for cooked applications like soups, sauces, and stews but will not have the texture for fresh applications like salads or garnish after freezing.
Basil specifically:
Basil blackens when exposed to cold and cannot be frozen successfully as whole leaves. Blend fresh basil with olive oil in a food processor and freeze in ice cube trays for the best basil preservation result. Each cube goes directly into pasta sauce, soup, or pizza from frozen and delivers a genuinely excellent fresh basil flavour through the depths of a Zone 6a winter.
Drying woody herbs:
Thyme, rosemary, oregano, sage, and lavender all dry beautifully and retain excellent flavour when dried correctly. Bundle stems in small bunches of five to ten stems, secure with an elastic band, and hang upside down in a warm, dry, well-ventilated location out of direct sunlight. A warm kitchen, a spare bedroom, or a dry basement corner all work well. Most woody herbs are fully dry within two to three weeks depending on ambient humidity. Once completely dry and crumbly, strip leaves from stems and store in labelled glass jars away from light and heat. Home-dried thyme, rosemary, and oregano from your own garden is significantly more flavourful than anything available in a supermarket spice aisle.
Herb butter:
Blend softened butter with finely chopped fresh herbs, roll into a log in parchment paper, and freeze. Herb butter made with chives, parsley, thyme, and garlic keeps in the freezer for up to six months and slices directly onto grilled steak, roasted vegetables, or crusty bread for an instant flavour hit of summer in the middle of winter.
Herb oil and herb vinegar:
Hardy herbs like rosemary, thyme, and tarragon make excellent infused oils and vinegars. Pack clean, completely dry herbs into a sterilised bottle, cover with good quality olive oil or white wine vinegar, seal, and store in a cool dark location. Herb-infused olive oil keeps for up to one month at room temperature or three months in the refrigerator. A bottle of homegrown rosemary olive oil made in October makes a beautiful and thoughtful gift through the holiday season.
Apples
Best preservation method: Cool storage, freezing, applesauce, dried apple rings
If you have an apple tree in your garden, October is harvest and storage season in Zone 6a Ontario and apples are one of the most versatile fall crops to preserve.
Cool room storage:
Many apple varieties store remarkably well in cool conditions between 0 and 4 degrees Celsius with moderate humidity. A cool room, unheated garage, or cold cellar in your Zone 6a home provides near-ideal apple storage conditions through the winter months. Store apples in a single layer on slatted wooden shelves or in shallow boxes where air can circulate around each fruit. Keep apples away from other stored vegetables since apples produce ethylene gas that accelerates ripening and deterioration in neighbouring produce.
Freezing apples:
Peel, core, and slice apples, toss with a small amount of lemon juice to prevent browning, and freeze in a single layer before transferring to freezer bags. Frozen apple slices go directly into pies, crumbles, and baked oatmeal from frozen without thawing.
Applesauce:
A large batch of homemade applesauce made from garden apples in October and frozen in portion-sized containers is one of the most versatile and satisfying fall preservation projects available. Use any apple variety or a mix of varieties, cook down with a small amount of water and a cinnamon stick, blend or leave chunky, and freeze in containers. Homemade applesauce from Zone 6a Ontario garden apples has a depth and flavour complexity that store-bought versions simply cannot match.
What to Do With the True Surplus
Even the most enthusiastic preserving session eventually reaches its limits and most Ontario home gardeners end October with more produce than they can realistically preserve and use themselves.
Share your surplus generously. Neighbours, colleagues, family members, and community food banks all welcome fresh garden produce in October. A basket of homegrown tomatoes, squash, and herbs left on a neighbour's doorstep is one of the most generous and appreciated gifts the fall garden has to offer.
Community food banks across Ontario actively seek fresh produce donations in fall and most will gratefully accept clean, undamaged garden vegetables. Contact your local food bank to confirm their donation guidelines before bringing a large quantity of produce.
Compost anything that is genuinely past its prime rather than attempting to preserve it. Well-made compost from your own garden produce returns nutrients to your soil and completes the growing cycle beautifully.
The Garden That Feeds You Through Winter
Every jar, bag, and container of preserved food from your garden is a small act of self-sufficiency and a genuine connection between the work you put into the soil this season and the meals you will enjoy through the long Ontario winter ahead. It is one of the most satisfying aspects of home gardening and one that new gardeners consistently describe as transformative once they experience it for the first time.
Stop by Lakeside Garden Gallery for any remaining garden supplies you need to close out your season and start planning for next year. Our team loves hearing about what you grew this season and would be happy to help you plan an even more productive garden in 2027. 🍅🧄🌿