First Frost Dates Canada: When Is the First Frost in My Area?
Average first fall frost dates for 28 Canadian cities, plus Ontario and Nova Scotia towns, each from Environment and Climate Change Canada climate normals. Harvest deadlines, fall planting windows, and links to detailed city frost guides.
Updated October 2026 · Environment and Climate Change Canada normals (1991–2020)
When is the first frost in my area?
It depends on where you live. On average, the first fall frost reaches the Prairies first, Sep 12 (Saskatoon) to Sep 23 (Edmonton); Quebec Sep 17 (Sherbrooke) to Oct 7 (Montreal); Ontario Sep 17 (Sudbury) to Nov 1 (Toronto); Atlantic Canada Sep 26 (Fredericton) to Oct 18 (Halifax); and British Columbia last, Oct 15 (Kelowna) to Dec 15 (Victoria). These are 30-year averages from Environment and Climate Change Canada (1991–2020 normals), so in half of years frost comes earlier — start watching the forecast two to three weeks before your date.
⏳ Racing the frost? Use Can I Still Plant This? — it checks each crop's days-to-maturity against your city's first frost date above and tells you, crop by crop, what there's still time to sow this year.
🌡️ Is frost coming tonight? Check Frost Tonight? — it pulls the coming night's forecast low for your city from live weather and tells you exactly which crops to cover this evening.
🍂 Not sure what's left to do? The Fall Garden Countdown takes your city's first frost date above and turns it into a dated to-do list — last sowings, lawn overseeding, spring bulbs, garlic planting, winterizer feed, and mulching once the ground has frozen.
🔔 Want a heads-up before frost hits? Get a free frost alert for your city — one email when frost is forecast in the next few nights, so you can cover your plants in time.
Planning the spring side of the season? See Last Frost Dates Canada — all 36 cities. For how the two dates combine, see Growing Season Length in Canada — 36 cities ranked by frost-free days. And for how that season length has shifted over time, see the Frost-Free Season Shift study (1981–2010 vs 1991–2020, same station in both periods).
🏠 Smaller town not on this list? We hold ECCC frost normals for 110 more Canadian towns — from Kenora and Cornwall to Gander, Dauphin and Terrace — each one naming the exact weather station it came from. No hardiness zone is given for those, because none is published.
📊 Writers, researchers, and garden clubs: all of these dates are available as a citable frost-dates dataset — one sortable table for 38 cities, with a free CSV download and an embeddable widget.
First Frost Dates by Province — Full Table
Latest frost first within each province. “Season” is the average frost-free period in days. Zones are Natural Resources Canada plant hardiness zones. Every figure in these tables is read from the same frost data the site’s calculators use.
British Columbia
| City | Average first frost | Zone | Season | Full Guide |
|---|---|---|---|---|
| Victoria | Dec 15 | 8b | ~280 days | First frost details → · Planting calendar → |
| Vancouver | Nov 30 | 8b | ~260 days | First frost details → · Planting calendar → |
| Nanaimo | Nov 15 | 8b | ~240 days | First frost details → · Planting calendar → |
| Kelowna | Oct 15 | 6b | ~163 days | First frost details → · Planting calendar → |
Alberta, Saskatchewan & Manitoba
| City | Average first frost | Zone | Season | Full Guide |
|---|---|---|---|---|
| Edmonton | Sep 23 | 4a | ~132 days | First frost details → · Planting calendar → |
| Calgary | Sep 21 | 3b | ~121 days | First frost details → · Planting calendar → |
| Winnipeg | Sep 20 | 3a | ~118 days | First frost details → · Planting calendar → |
| Regina | Sep 17 | 3a | ~119 days | First frost details → · Planting calendar → |
| Saskatoon | Sep 12 | 3a | ~110 days | First frost details → · Planting calendar → |
When is the first frost in Ontario?
Ontario’s first fall frost runs Sep 7 (Timmins) to Nov 1 (Toronto). The cities along the lower Great Lakes frost last: Toronto Nov 1, Windsor Oct 28, Hamilton Oct 28. Ottawa averages Oct 12, Barrie Sep 24 and Sudbury Sep 17. Averages from Environment and Climate Change Canada climate normals.
| City | Average first frost | Zone | Season | Full Guide |
|---|---|---|---|---|
| Toronto | Nov 1 | 6b | ~195 days | First frost details → · Planting calendar → |
| Mississauga | Oct 28 | 6b | ~191 days | First frost details → · Planting calendar → |
| Windsor | Oct 28 | 7a | ~191 days | First frost details → · Planting calendar → |
| Hamilton | Oct 28 | 6b | ~186 days | First frost details → · Planting calendar → |
| London | Oct 18 | 6a | ~179 days | First frost details → · Planting calendar → |
| St. Catharines | Oct 18 | 7a | ~175 days | Planting calendar → |
| Ottawa | Oct 12 | 5a | ~156 days | First frost details → · Planting calendar → |
| Barrie | Sep 24 | 5b | ~126 days | First frost details → · Planting calendar → |
| Sudbury | Sep 17 | 4b | ~109 days | First frost details → · Planting calendar → |
Smaller Ontario towns
Each date is from the town’s own Environment and Climate Change Canada weather station, named below. No hardiness zone is shown because none is published for these stations. More towns: frost dates for 110 Canadian towns.
| Town | Average first frost | Season | ECCC station (Climate ID) |
|---|---|---|---|
| Harrow | Oct 23 | ~180 days | HARROW (6133360) |
| Brockville | Oct 14 | ~169 days | BROCKVILLE (6100970) |
| Fort Erie | Oct 12 | ~160 days | FORT ERIE (6132470) |
| Cornwall | Oct 10 | ~164 days | CORNWALL (6101874) |
| Wiarton | Oct 10 | ~151 days | WIARTON (6119499) |
| Welland | Oct 9 | ~151 days | WELLAND (6139445) |
| Ridgetown | Oct 6 | ~149 days | RIDGETOWN (6137149) |
| Kenora | Oct 2 | ~144 days | KENORA A (6034075) |
| North Bay | Sep 29 | ~135 days | NORTH BAY (6085680) |
| Sault Ste. Marie | Sep 29 | ~123 days | SAULT STE MARIE (6057591) |
| Peterborough | Sep 24 | ~130 days | PETERBOROUGH (6166415) |
| Haliburton | Sep 16 | ~104 days | HALIBURTON 3 (6163171) |
| Kapuskasing | Sep 15 | ~101 days | KAPUSKASING A (6073975) |
| Timmins | Sep 7 | ~91 days | TIMMINS/VICTOR POWER (6078282) |
Quebec
| City | Average first frost | Zone | Season | Full Guide |
|---|---|---|---|---|
| Montreal | Oct 7 | 5b | ~151 days | First frost details → · Planting calendar → |
| Gatineau | Oct 6 | 5a | ~159 days | — |
| Quebec City | Sep 28 | 5a | ~134 days | First frost details → · Planting calendar → |
| Sherbrooke | Sep 17 | 4b | ~112 days | — |
When is the first frost in Nova Scotia?
Nova Scotia’s first fall frost runs Sep 24 (Bridgewater) to Oct 24 (Yarmouth). Halifax averages Oct 18, Greenwood in the Annapolis Valley Oct 4 and Parrsboro Oct 2. Town dates come from each town’s own Environment and Climate Change Canada weather station.
| City | Average first frost | Zone | Season | Full Guide |
|---|---|---|---|---|
| Halifax | Oct 18 | 6a | ~161 days | First frost details → · Planting calendar → |
Smaller Nova Scotia towns
Each date is from the town’s own Environment and Climate Change Canada weather station, named below. No hardiness zone is shown because none is published for these stations. More towns: frost dates for 110 Canadian towns.
| Town | Average first frost | Season | ECCC station (Climate ID) |
|---|---|---|---|
| Yarmouth | Oct 24 | ~179 days | YARMOUTH (8206491) |
| Greenwood | Oct 4 | ~142 days | GREENWOOD A (8202000) |
| Parrsboro | Oct 2 | ~133 days | PARRSBORO (8204400) |
| Bridgewater | Sep 24 | ~119 days | BRIDGEWATER (8200600) |
New Brunswick, PEI & Newfoundland
| City | Average first frost | Zone | Season | Full Guide |
|---|---|---|---|---|
| Charlottetown | Oct 14 | 5b | ~157 days | First frost details → · Planting calendar → |
| St. John's | Oct 13 | 5b | ~142 days | First frost details → · Planting calendar → |
| Saint John | Oct 8 | 5b | ~153 days | First frost details → · Planting calendar → |
| Moncton | Sep 28 | 5a | ~136 days | First frost details → · Planting calendar → |
| Fredericton | Sep 26 | 5a | ~132 days | First frost details → · Planting calendar → |
What the First Frost Actually Means for Your Garden
The first frost of any intensity — usually a light radiation frost of 0 to −2°C on a clear, calm night — ends the tender crops: tomatoes, peppers, basil, cucumbers, zucchini, beans, and squash vines. But it is not the end of the garden. In every Canadian city, the first hard freeze (−4°C or colder) trails the first light frost by two to four weeks, and the hardy crops — kale, Brussels sprouts, carrots, parsnips, leeks, cabbage — not only survive light frost but genuinely taste better after a few cold nights convert their starches to sugar.
The practical playbook everywhere in Canada: harvest or cover the tender list before your city's first frost; leave the hardy list in the ground and keep harvesting; plant garlic and spring bulbs at or just after first frost; and keep a roll of floating row cover by the door — covering tender crops through the first one or two cold nights routinely buys two to four more weeks of harvest, because mild weather almost always returns after the first frost passes. The full fall playbook is in the Fall Vegetable Garden guide. For the covers themselves, see Best Frost Protection for Canadian Gardens.
The roll the paragraph above tells you to keep by the door. Spun-bonded fabric of this weight is built for exactly the frost this page is about — a light radiation frost of 0 to −2°C — and it is the two-to-four-week gap before the first hard freeze that it buys you. It will not carry a bed through −4°C or colder; nothing this light will, and a page that told you otherwise would cost you the crop. Light enough to lay over tomatoes and peppers on the evening of, and to fold away the next morning when the mild weather comes back.
Affiliate link — GrowersGuide.ca may earn a commission on qualifying purchases, at no extra cost to you. Learn more.
How to Use Your First Frost Date: the Count-Back Planner
Just as the last spring frost anchors the spring schedule, the first fall frost anchors the fall one — you count backwards from it to find your final sowing dates:
- 12 weeks before first frost: last sowing of carrots, beets, and rutabaga for fall storage
- 10 weeks before: last sowing of bush beans and zucchini; transplant fall broccoli and cabbage
- 8 weeks before: last sowing of peas (fall crop), turnips, and Swiss chard
- 6 weeks before: last sowing of lettuce, arugula, and radishes in the open
- 4 weeks before: last spinach and mâche sowings — these continue under row cover after frost
- At first frost: plant garlic and spring bulbs; harvest or cover all tender crops
Common Questions
Is the first frost date the end of the growing season?
No — it's the end of the tender season. Kale, Brussels sprouts, carrots, parsnips, leeks, cabbage, and spinach all continue for weeks (in coastal BC, all winter) after the first frost, and most of them improve with it. The true end is the first hard freeze (−4°C or colder), which typically arrives 2–4 weeks after the first light frost, plus the fading day length — below about 10 hours of daylight, growth stops regardless of temperature.
Why does my garden frost before the forecast says it should?
Official temperatures are measured at 1.5 m above ground at airport weather stations. On clear, calm nights, the ground surface in a garden runs 2–3°C colder than the station reading, and low-lying yards collect cold air draining downslope. The all-Canada rule: from two to three weeks before your city's average first frost date, treat any clear-night forecast of 4°C or below as a frost watch for tender crops.
Do first frost dates change with climate change?
Gradually, yes. The 1991–2020 climate normals show first frosts averaging several days later than the older 1981–2010 reference period in most Canadian cities — the fall has lengthened slightly more than the spring has advanced. ECCC updates its 30-year normals every decade; the dates on this page reflect the current official reference period and will remain the standard until the next update around 2031. Year-to-year variation (±2–3 weeks) still dwarfs the decade-scale trend, so the planning advice doesn't change: watch the forecast, not the calendar.
Where do these frost dates come from?
Environment and Climate Change Canada (ECCC) climate normals for the 1991–2020 reference period, drawn from each city's primary climate stations. Dates are 50th-percentile averages — half of years frost before the listed date, half after. City pages on this site break the averages down further by neighbourhood, elevation, and microclimate.
What is the first frost date in Canada?
Canada's first fall frost dates span from September 12 in Saskatoon (Zone 3b) to around December 15 in Victoria (Zone 8b) — a range of three months across the country. Major city dates for 2026: Saskatoon September 12, Regina September 17, Winnipeg September 20, Calgary September 21, Edmonton September 23, Quebec City September 28, Montreal October 7, Ottawa October 12, Halifax October 18, Toronto November 1, Vancouver November 30, Victoria December 15. These are historical averages based on Environment and Climate Change Canada climate normals (1991–2020) — individual years vary by 2–3 weeks.
When is the first frost in 2026?
First frost dates in 2026 follow historical climate normals — they are not affected by the calendar year. The Prairie cities frost first: Saskatoon around September 12, Regina September 17, Winnipeg September 20, Calgary September 21, Edmonton September 23. Central Canada follows: Quebec City September 28, Montreal October 7, Ottawa October 12, Toronto November 1. The coasts hold out longest: Halifax October 18, Vancouver November 30, Victoria mid-December. These dates are 50th-percentile averages — half of years frost earlier, half later — so start watching forecasts 2–3 weeks before your city's date.
Which Canadian city has the earliest first frost?
Among major cities, Saskatoon has the earliest first fall frost — around September 12, giving it Canada's shortest big-city growing season at about 110 frost-free days. Regina follows at September 17, Winnipeg September 20, Calgary September 21, and Edmonton September 23. The Prairie pattern is driven by dry continental air and, in Calgary's case, ~1,045 m of elevation: clear September nights shed heat fast, and the first Arctic air masses of the season arrive weeks before they reach Central Canada.
Which Canadian city has the latest first frost?
Victoria, BC — around December 15, and in mild winters no frost arrives at all until January. Vancouver is second at November 30, Nanaimo November 15. Outside coastal BC, Toronto holds out longest of any major city at November 1, thanks to Lake Ontario releasing stored summer heat through the fall. The three-month spread between Saskatoon (September 12) and Victoria (December 15) is the widest seasonal gap in Canadian gardening.
How do I use my city's first frost date for fall gardening?
Count backwards from your first frost date to schedule the fall garden. Last sowing of beans and zucchini: 10 weeks before first frost. Last carrot and beet sowing: 10–12 weeks before. Last lettuce and spinach sowings: 4–6 weeks before (they continue under row cover after frost). Harvest deadline for tomatoes, peppers, and basil: the first frost itself — or 1–2 weeks earlier to be safe. Garlic planting: at or just after first frost, 2–3 weeks before the ground freezes. And remember the first frost is usually light — kale, Brussels sprouts, carrots, and parsnips taste better after it and can stay in the ground for weeks longer.
Get Your Full Planting Calendar
Every city above links to a complete planting guide that turns both frost dates into a month-by-month schedule — spring sowings, fall successions, and harvest deadlines for 25+ vegetables.