What is the last frost date in Montreal?

The average last spring frost in Montreal is around May 3–9, with a safe planting date for tender crops like tomatoes of mid-May. The first fall frost in Montreal typically arrives around October 7–14. Montreal's growing season is approximately 155–175 frost-free days — longer than Prairie cities but shorter than Toronto. Use this calculator to find exact frost dates for Montreal and other Quebec cities.

What is the last frost date in Canada by city?

Last spring frost dates vary widely: Vancouver around April 15, Toronto around May 9, Montreal around May 5, Ottawa around May 10, Calgary around May 23, Edmonton around May 15, Winnipeg around May 25, and Halifax around April 20. Northern cities like Yellowknife can see frost as late as early June. Use the calculator above to find your exact city.

When is it safe to plant tomatoes in Canada?

Tomatoes should be transplanted outdoors after your last spring frost date when nighttime temperatures stay above 10°C. In Toronto this is typically after May 9, in Vancouver after April 15, in Montreal after May 5, in Calgary after May 23, and in Winnipeg after May 25. Add 1–2 weeks buffer for extra safety with expensive transplants.

How long is the Canadian planting season in 2026?

The Canadian planting season in 2026 runs from late April in coastal BC to late May on the Prairies. Most gardeners can plant frost-sensitive crops outdoors from mid-May (Ontario, Quebec) to early June (northern regions). The growing season ranges from about 100 frost-free days in Winnipeg to over 200 days in Vancouver. Your exact planting season dates depend on your city's last spring and first fall frost dates.

What is the first fall frost date in Canada?

First fall frost dates vary by city. Vancouver typically sees its first fall frost around November 15, Toronto around October 20, Montreal around October 7, Calgary around September 15, and Winnipeg around September 22. Use this calculator to find your city's specific first fall frost date and plan your harvest accordingly.

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Frost Date Calculator

Find the last frost date in your area — last spring frost, first fall frost, and hardiness zone for 100+ Canadian cities

Last frost date in my area: Vancouver around March 15, Toronto April 20, Halifax May 10, Ottawa/Montreal May 9, Edmonton May 14, Winnipeg May 19, Calgary May 23, Saskatoon May 25. Pick your city above for exact last spring + first fall frost dates and hardiness zone.

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Understanding Frost Dates for Canadian Gardeners

Frost dates are the single most important piece of information for any Canadian gardener. Canada's climate varies dramatically — Vancouver gardeners can plant weeks before those in Calgary or Winnipeg, and gardeners in Newfoundland face a growing season nearly half as long as those in southern Ontario. Getting your frost dates wrong means losing seedlings to a late spring frost or rushing a harvest before fall frost kills your tomatoes.

Our frost date data is sourced from Environment Canada historical weather records and updated annually — the same proven data used by expert Canadian growers and agricultural extension services. All dates are displayed in metric-friendly format alongside your hardiness zone, giving you everything you need to plan a successful season.

Your last spring frost date is the average date after which freezing temperatures are unlikely — your green light for warm-season crops like tomatoes, peppers, and cucumbers. Your first fall frost date tells you when your growing season ends, so you can plan harvests and succession planting around it. Together, these two dates define your growing window.

Frequently Asked Questions

What is the last frost date in my area?

Use the calculator above to find your exact last frost date — pick your city from the dropdown to see the average last spring frost, first fall frost, hardiness zone, and frost-free growing season length. Major Canadian cities: Vancouver around March 15, Victoria March 10, Toronto April 20, Hamilton April 25, Halifax May 10, Ottawa May 9, Montreal May 9, Edmonton May 14, Winnipeg May 19, Calgary May 23, Saskatoon May 25. The calculator covers 100+ Canadian cities; for areas not listed, use the closest match — frost dates within a 50 km radius are typically within 3–5 days of each other except in mountain regions.

What is the last frost date in Canada?

It depends on your city. Most of southern Canada experiences its last spring frost between late April and early June. Vancouver averages around April 15, Toronto around May 9, Calgary around May 23, and Winnipeg around May 25. Northern cities like Yellowknife can see frost as late as early June.

What can I plant before the last frost date in Canada?

Cold-hardy vegetables can go in 2–4 weeks before your last frost date. These include peas, spinach, kale, lettuce, radishes, arugula, beets, and carrots. These crops can handle light frost (down to -2°C) and actually prefer cooler temperatures. Wait until after your last frost for tomatoes, peppers, cucumbers, squash, and beans.

How long is the growing season in Canada?

Growing season varies enormously by region. Vancouver enjoys roughly 225 frost-free days. Southern Ontario (Toronto, London) averages 150–175 days. Calgary and Edmonton get around 120–130 days. Winnipeg has about 120 days and St. John's, Newfoundland as few as 100. Knowing your growing season helps you choose the right vegetable varieties — always check "days to maturity" on seed packets.

What is my Canadian hardiness zone?

Canada uses its own Plant Hardiness Zone system (0a through 8b) based on minimum winter temperatures and other climate factors. Most of southern Canada falls in zones 5–7. Vancouver is zone 8, Toronto is zone 6, Calgary is zone 4, and Winnipeg is zone 3. Our calculator shows your zone alongside your frost dates to help you choose the right plants and perennials for your region.

When should I start seeds indoors in Canada?

Count backward from your last frost date. Tomatoes and peppers need 6–8 weeks indoors, so if your last frost is May 24 (common in Alberta), start them indoors between late March and early April. Onions and leeks need 10–12 weeks. Use our Seed Starting Calculator to get an exact indoor planting schedule for your city.

How accurate are frost date predictions?

Frost dates are statistical averages based on historical weather data — typically a 50% probability of frost on or before that date. This means there's still a 50% chance of a late frost after your "last" frost date. For tender crops like tomatoes and peppers, many experienced Canadian gardeners wait an extra 1–2 weeks past their average last frost date, or keep row covers handy just in case.