When to Plant Vegetables in Montreal — 2026 Planting Calendar

⚠️ Suburb note: Laval, Longueuil, Brossard, and North/South Shore municipalities typically run 1–2 weeks later on last frost — plan for May 15–20 if you're outside the urban core.

Tomatoes — Among Canada's Best

Montreal's July and August heat regularly tops 26°C, and warm nights allow fruit to ripen quickly. Unlike Vancouver (too cool) or Winnipeg (too short), Montreal gives tomatoes exactly what they need. Indeterminate varieties with 80-day maturity ripen comfortably before frost.

Courge Spaghetti and Winter Squash

Courge spaghetti (spaghetti squash) is practically a Quebec garden staple. It needs 90–100 warm days, which Montreal provides reliably. Start indoors in late April and transplant after May 20. Winter squash stores through November and beyond — high calorie, long shelf life, and uniquely suited to Quebec's growing window.

Ail / Garlic — A Quebec Specialty

Quebec has an exceptional garlic culture — the province produces some of the best hardneck garlic in the country. Cold Zone 5b winters are ideal for the cold stratification hardneck varieties need. Plant in mid-October, harvest scapes in June, pull full bulbs in late July. Varieties to try: Rocambole (Killarney Red), Porcelain (Music — a Quebec favourite), and Purple Stripe.

Maïs sucré / Sweet Corn

Sweet corn needs a solid 65–75 days of genuine heat — something Winnipeg and Calgary can't reliably deliver. Montreal's summer gives corn exactly what it needs. Direct sow in late May, harvest in August. Plant in blocks of at least 4 rows for good pollination rather than a single long row.

Haricots / Beans

Yellow wax beans (haricots jaunes) are a Quebec garden classic. Direct sow after May 20 when soil is warm, succession sow every 2–3 weeks through June for continuous harvest. The heat of Montreal summer is ideal — beans produce prolifically and dry bean varieties like Romano can be left to mature fully on the vine for winter storage.

Poivrons / Peppers

Peppers need 8–10 weeks indoors (start in March) and warm soil to transplant into. In Montreal's hot July, peppers produce well from mid-summer through September. Sweet bell peppers need 70–75 days; hot peppers generally take longer and do better in the warmest spots. A south-facing raised bed helps considerably.

Jardins communautaires de Montréal

Montreal has over 110 community gardens (jardins communautaires) spread across the city — one of the largest community garden networks in North America. Plot demand far exceeds supply and waitlists can be several years long. If you're on a waitlist, the priority is growing high-yield, efficient crops in a small space: tomatoes, garlic, beans, and herbs return the most food per square foot. Use the plant spacing calculator to maximize your plot.

Quebec seed companies and heritage varieties

Quebec has an exceptional local seed culture. Jardins de l'Écoumène (Saint-Damien) and Semences du Portage (Kamouraska) specialize in heirloom and heritage varieties suited to Quebec's climate. Many are varieties that perform better in Montreal's specific conditions than standard North American seed catalogue selections. If you haven't grown Tomate Brandywine or Haricot Tongue of Fire from a Quebec seed house, you're missing something.

La drave printanière — the spring mud season

Montreal gardeners know the frustration of April: the snow is gone but the soil is saturated, cold, and completely unworkable. Stepping on wet spring soil compacts it badly. Raised beds are the answer — they warm up 2–3 weeks earlier than ground-level beds, drain freely, and give you a productive head start while everything else is still mud. The raised bed calculator helps plan soil volume and materials.

The May long weekend trap

Every Quebec gardener eventually learns this lesson: the May long weekend (Journée nationale des patriotes, third Monday of May) is not safe for frost-sensitive transplants. In Montreal, the last frost averages May 9 but late frosts occur regularly into mid-May. Many experienced Montreal gardeners don't put out tomatoes and peppers until the last week of May to eliminate frost risk entirely. Hardening off 7–10 days before transplanting is essential regardless of timing.

L'été des Indiens — Indian summer extends the season

Montreal's warm October Indian summer (l'été des Indiens) is a real asset. First frost averages October 7 but warm spells in mid-October can extend the tomato season significantly. Keep row cover or frost cloth on hand from late September — draping it over tomatoes on cold nights buys another 2–3 weeks of harvest in good years. Late-season tomatoes left on the vine during a Montreal Indian summer are some of the best of the year.

• Start onions and leeks (mid-Feb)
• Order all seeds if not done
• Inspect grow lights and seed starting setup

• Start peppers indoors (early-mid March)
• Start broccoli, cabbage, celery
• Start tomatoes (late March)
• Start lettuce for early indoor transplants

• Direct sow peas outdoors (mid-April)
• Direct sow spinach, arugula outdoors
• Transplant broccoli, cabbage, lettuce (late April)
• Start cucumbers, squash indoors (late April)
• Begin hardening off tomatoes and peppers

• Plant potatoes (early May)
• Transplant tomatoes (after May 15, ideally May 20–25)
• Transplant peppers, cucumbers, squash (after May 20)
• Direct sow beans, corn (after May 20)
• Direct sow carrots, beets

• Harvest peas, spring lettuce, early broccoli
• Harvest garlic scapes (June), full bulbs (July)
• Harvest potatoes (August)
• Sow fall lettuce, spinach, Asian greens (Aug)
• Succession sow carrots and beans through June
• Water consistently — Montreal July can be hot and dry

• Harvest tomatoes — peak season through Sept
• Harvest winter squash (Sept–Oct)
• Harvest root vegetables before hard freeze
• Plant garlic (mid-October to Nov 1)
• Use row cover to extend tomatoes past Oct 7
• Mulch perennials before freeze

Quelle est la date du dernier gel à Montréal? / When is the last frost in Montreal?

La date moyenne du dernier gel est le 9 mai pour l'île de Montréal (zone 5b). Les banlieues (Laval, Longueuil, Rive-Sud) doivent planifier pour le 15 au 20 mai. / Average last frost is May 9 for the island of Montreal. Suburbs should plan for May 15–20.

When should I start tomatoes indoors in Montreal?

Start tomato seeds indoors in late March to early April — 6 to 8 weeks before the May 9 last frost. Don't start earlier than late March or seedlings get leggy. Transplant outdoors after May 15, ideally May 20–25 to eliminate frost risk entirely.

Quand planter l'ail à Montréal? / When to plant garlic in Montreal?

Plantez l'ail à tête dure entre le 15 octobre et le 1er novembre, après les premières gelées légères mais avant que le sol ne gèle. Récoltez en juillet. / Plant hardneck garlic between October 15 and November 1, after the first light frosts but before the ground freezes. Harvest in late July.

How long is the growing season in Montreal?

About 150 frost-free days, from May 9 to October 7. While shorter than Toronto or Vancouver, the hot Montreal summer (July highs of 26–28°C) makes it excellent for heat-loving crops like tomatoes, peppers, corn, and squash.

What zone is Montreal?

Montreal is Zone 5b for most of the island. Central neighbourhoods with urban heat island effect (Plateau-Mont-Royal, Rosemont, Verdun) can push Zone 6a in mild winters. Laval and South Shore suburbs typically run Zone 5a.