Find your last spring frost and first fall frost dates for safe planting
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.
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.
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.
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.
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.
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.
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.
Put your frost dates to work — plan your full season.