There is a particular kind of joy that a cold climate gardener understands. It arrives sometime in late February or early March, when the days start stretching just a little bit longer and the afternoon sun feels like it actually means something. You catch yourself staring out the kitchen window at the snow-covered garden beds, mentally mapping out rows of tomatoes and dreaming of that first crisp bite of homegrown lettuce. After months of frozen ground and grey skies, the pull toward the garden is almost physical.

If you are anything like us, you did not wait for the snow to melt to get started. We had our hands in seed trays back in January, carefully tucking onion and leek seeds into warm soil under grow lights. February brought more activity with celery, early herbs, and leafy greens getting their start indoors. Now, in March, the seed-starting shelves are truly buzzing with life, peppers, tomatoes, eggplants, and a whole parade of flowers are reaching for the light. The gardening season in Ontario does not begin when the frost lifts. It begins the moment you crack open that first seed packet in the quiet of winter.

This post is for every gardener who is ready to shake off the winter blues and get growing. Whether you are a seasoned grower or someone who is trying this for the very first time, let’s walk through what spring looks like for us, what you can be doing right now, and how to set yourself up for the most productive and rewarding garden season yet.

The head start: seeds we started in January, February, and March

One of the biggest lessons in gardening is that our growing season, while generous in warmth and sunlight during the summer months, is bookended by frost. That means certain crops need a significant head start indoors if they are going to produce anything meaningful before fall arrives.

In January, we focused on the slow growers like onions and leeks. These alliums have a notoriously long germination period and need months of indoor growth before they are robust enough to handle transplanting. Starting them in the first weeks of the year gives them the runway they need. By the time they go into the ground in May, they will have developed strong root systems and sturdy green tops ready to take off. If you missed the January window for onions, you can still plant sets or transplants later in the season, but growing from seed gives you access to a much wider variety of cultivars.

February expanded our seed-starting operation. We added celery, which is another crop that benefits enormously from an early start given its long growing season. Leafy greens like kale, swiss chard, and various lettuces also went into trays. These cold-hardy crops can be transitioned outdoors earlier than warm-season vegetables, so getting them going in February means they are strong transplants ready for the garden as soon as the soil is workable. We also started a round of herbs—parsley, chives, and oregano—which are slow to germinate and appreciate the extra time indoors.

March is the big month. This is when tomatoes, peppers, and eggplants get their start under the grow lights. These heat-loving crops need about six to eight weeks of indoor growth before they can go outside after the last frost date. Starting them in early to mid-March puts them on the perfect timeline for a late May transplant. We also use March to start flowers like marigolds, zinnias, and cosmos, which will fill in around the vegetable beds and attract pollinators all summer long. Basil joins the party now too, alongside any squash or cucumber varieties we want to give a slight head start to, though these can also be direct sown later.

When can we actually get outside? Direct sowing and transplanting in zone 5b

This is the question we often ask as we watch the snow slowly retreat from the garden beds. In zone 5b, the average last frost date falls around mid to late May. For many parts of southern and central Ontario, including areas around the GTA, Ottawa, and surrounding regions, you can generally expect the risk of frost to be past by the third or fourth week of May. However, it is always wise to keep an eye on the forecast and have row cover or old bedsheets on hand just in case a late frost sneaks in.

But here is the thing: you do not have to wait until late May to start working the soil. Cold-hardy crops can go into the ground much earlier. As soon as the snow has melted and the soil is workable, which in zone 5b typically means mid to late April, you can begin direct sowing cool-season vegetables. Peas, spinach, radishes, arugula, carrots, beets, turnips, and parsnips can all handle light frost and cooler soil temperatures. These crops actually prefer the cool conditions of early spring and tend to bolt once summer heat arrives, so getting them in the ground early is not just possible, it is ideal.

This is also the time to transplant those cold-hardy seedlings you started indoors back in February. Kale, lettuce, Swiss chard, broccoli, cauliflower, and cabbage can all be hardened off and moved into the garden in late April or early May, provided you have been gradually exposing them to outdoor conditions over the course of a few days to a week or so. Hardening off is a critical step that many new gardeners skip, and it makes all the difference. Start by setting your seedlings outside in a sheltered spot for a couple of hours a day, gradually increasing their exposure to wind, sun, and cooler temperatures over 5-10 days.

Once you are past the last frost date in late May, the garden really opens up. This is when you transplant your tomatoes, peppers, eggplants, basil, and other warm-season crops. It is also when you can direct sow beans, corn, squash, cucumbers, melons, and sunflowers. The soil should be warm, ideally around 15 to 18 degrees Celsius, for these heat-loving seeds to germinate well.

Preparing your beds for the season ahead

Resist the urge to work the soil too early. Digging or tilling soil that is still waterlogged from snowmelt can create compacted clumps that will haunt you for the rest of the season. To test whether your soil is ready, grab a handful and squeeze it. If it forms a tight, sticky ball, it is too wet. If it crumbles apart easily, you are good to go. Once the soil is workable, you can gently turn in compost to replenish nutrients that were depleted during last year’s growing season.

If you use raised beds, you have a slight advantage here. Raised beds tend to warm up faster than in-ground plots because they have better drainage and more exposure to sunlight on all sides. You can sometimes get into raised beds a week or two earlier than traditional garden rows, which is a meaningful head start in a climate like ours.

Tips to start your gardening season on the right foot

Get your soil tested

If you have not had your soil tested in a couple of years, early spring is the perfect time. A simple soil test will tell you your pH level and nutrient content, allowing you to amend the soil precisely rather than guessing. Most vegetables prefer a slightly acidic to neutral pH of around 6.0 to 7.0. Your local garden centre or agricultural extension office can point you toward testing options.

Plan your layout before you plant

Sketching out a garden plan might seem like a small thing, but it saves so much time and confusion once planting day arrives. Think about crop rotation, try to avoid planting the same family of vegetables in the same spot as last year to reduce soil-borne disease. Consider companion planting too. Tomatoes and basil are classic garden neighbours, and marigolds planted along the borders can help deter common pests. Tall crops like corn and sunflowers should go on the north side of your beds so they do not shade out shorter plants.

Invest in season extension tools

In zone 5b, a few simple tools can extend your season by weeks in both spring and fall. Cold frames, row covers, and hoop tunnels are relatively inexpensive and incredibly effective. A cold frame placed over a raised bed in early April can create a microclimate warm enough to grow lettuce, spinach, and radishes well before the rest of the garden is ready. In fall, these same tools will protect your late-season crops from early frosts and keep you harvesting well into November.

Start a compost system if you have not already

Composting is one of the best things you can do for your garden. Kitchen scraps, yard waste, and fallen leaves can all be transformed into rich, dark compost that feeds your soil naturally. If you start a pile now, you will have usable compost by mid-summer or fall. Even a simple bin in the corner of the yard will do. Turn it regularly, keep it moist, and balance your green nitrogen-rich materials with brown carbon-rich materials.

Keep a garden journal

This is one of those tips that sounds optional until you actually do it and realize how valuable it is. Write down what you plant, when you plant it, what varieties you chose, and how everything performs. Note the weather, pest issues, and which crops thrived or struggled. Over the years, this journal becomes your most reliable guide, far more tailored to your specific conditions than any generic planting chart.

Do not forget about watering infrastructure

Before the season gets busy, take stock of your hoses, sprinklers, and any drip irrigation you use. Replace cracked hoses, clean out drip emitters, and make sure everything is in working order. Setting up a soaker hose or drip system early means you will not be scrambling to water consistently during the first hot spell. Consistent, deep watering is far more effective than frequent shallow watering, especially for crops like tomatoes and peppers that develop deep root systems.

Sharpen and clean your tools

A sharp pair of pruners and a clean spade make every garden task easier. Take an afternoon to sharpen blades, oil wooden handles, and wipe down metal surfaces. Clean tools also reduce the spread of disease between plants. It is a small investment of time that pays off all season long.

The season of possibility

There is something deeply grounding about the rhythm of a gardening year. The quiet planning of January, the hopeful seed-starting of February and March, the eager anticipation of April as the ground wakes up, and the full-throttle planting frenzy of May and June, each phase has its own character and its own rewards. After a long winter spent indoors, getting your hands back in the soil feels like a kind of homecoming.

Whether you are growing a few pots of herbs on a balcony or managing a sprawling backyard vegetable patch, the principles are the same: start early where you can, know your frost dates, feed your soil, and pay attention. The garden will teach you something new every single year if you let it.

So get those seed trays going, dust off the garden gloves, and start dreaming about harvest season. Spring in our zone is almost here, and there is no better time to grow.

Happy growing! 💚💚