Southern Ontario Spring Planting Guide 🌱

What to Plant in May for a Thriving Summer Garden

There’s something exciting about finally getting your hands back into the soil after a long Ontario winter. May is one of the best months to kick off your vegetable garden and start planning for a productive, beautiful summer ahead.

Whether you’re a seasoned gardener or just trying your first few planters on the deck, knowing when to plant can make all the difference. Southern Ontario weather can be unpredictable, so timing your crops properly helps set you up for success.

🌿 Why Timing Matters

Planting too early can expose tender plants to frost, cold soil, and slow growth. Waiting for warmer temperatures allows seeds and transplants to establish stronger roots and healthier plants.

In Southern Ontario, most gardeners begin planting once the soil warms and overnight temperatures become more consistent—typically through May.

🌱 What You Can Plant in May

Cool Weather Crops

These vegetables actually enjoy cooler temperatures and can usually be planted earlier in the season:

• Lettuce

• Spinach

• Radishes

• Peas

• Kale

• Carrots

• Onions

These crops tend to grow quickly and are perfect for beginner gardeners.

A little preparation in spring can lead to a beautiful, productive garden all summer long. Start small, enjoy the process, and don’t stress about perfection—gardening is always a learning experience.

Happy planting! 🌱