When to Plant Garlic in Toronto, ON
Published: April 24, 2026 · Updated: April 27, 2026
Garlic is planted in fall and harvested the following summer — the opposite timing from most vegetables. It is one of the most hands-off, rewarding crops once established.
Toronto sits in Canadian Zone 6b (USDA equivalent 6a) along the shore of Lake Ontario. The lake-effect moderation produces warm summers, cold winters, and one of Canada's longest growing seasons at 195 frost-free days. Tomatoes and peppers thrive; warm-season crops ripen reliably from mid-June through early October.
Garlic Planting Calendar for Toronto
Direct sow outdoors: October–November (plant cloves)
Harvest window: June (following year) – July (following year)
Minimum soil temperature: 10°C (50°F)
Days to harvest: 240–270 days
Sun requirement: Full sun
⚠ PLANTING SEASON IS OPPOSITE: Plant garlic cloves in fall (October–November) for harvest the following summer (June–July). This is unlike any other common vegetable.
Toronto Climate Notes
Lake Ontario extends the growing season 2-3 weeks compared to inland Ontario. Toronto gardeners enjoy one of Canada's longest productive windows. Heirloom and heat-loving varieties that struggle farther north (eggplant, melons, sweet potato) succeed reliably here.
Growing Tips for Garlic
- Plant individual cloves in October–November, pointed end up, 2 inches deep, 6 inches apart.
- Mulch with 3–4 inches of straw after the first hard freeze to insulate through winter.
- Remove garlic scapes (the curling flower stalks) in June from hardneck varieties to redirect energy to the bulb.
- Harvest when the bottom 3–4 leaves turn brown — typically June in most regions.
Companion Planting in Toronto
Pair garlic with Tomato, Rose, Carrot, Cucumber for mutual benefit. Avoid planting near Bean, Pea, Parsley, which compete with or inhibit garlic growth.
Pests and Problems to Watch in Toronto
The most common pest and disease pressure on garlic in Toronto comes from Thrips, White Rot, Garlic Rust, Onion Fly. Floating row covers through the first 4–6 weeks after planting block adult pests from laying eggs, and a weekly scouting routine catches infestations before they damage the crop.
Other Ontario Cities
Frequently Asked Questions
When do I plant garlic in Toronto?
Toronto's last spring frost is around April 20. Direct sow October–November (plant cloves).
What Canadian hardiness zone is Toronto?
Toronto is in Canadian Zone 6b (USDA equivalent 6a). The Great Lakes temperate climate delivers 195 frost-free days from April 20 to November 1, which shapes every planting date in the local calendar.
How long is Toronto's growing season?
Toronto has 195 frost-free days — from April 20 in spring to November 1 in fall. Garlic take 240–270 days to mature, which is tight in Toronto's 195-day window. Choose the shortest-season varieties and protect from early fall frosts with row cover.
Can I grow garlic in containers in Toronto?
Yes. Container growing on balconies and decks is practical in Toronto — choose a 5-gallon or larger dark-coloured container to warm the root zone, use a high-quality potting mix, and water daily during hot summer weather. In milder climates, containers extend both spring and fall windows by several weeks.
What is the first fall frost in Toronto?
Toronto's average first fall frost is November 1. Most garlic in Toronto is a single spring-timed planting designed to harvest before the first fall frost.