First Frost Dates Canada 2026 — 25 Cities by Province
First frost dates for 25 major Canadian cities — from Saskatoon's September 12 to Victoria's mid-December. Harvest deadlines, fall planting windows, and links to detailed city frost guides.
Updated June 2026 · Environment and Climate Change Canada normals (1991–2020)
Major city first frost dates 2026
Historical averages based on Environment and Climate Change Canada climate normals (1991–2020). Individual years vary by ±2–3 weeks.
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.
First Frost Dates by Province — Full Table
British Columbia
| City | First Frost 2026 | 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 | First Frost 2026 | Zone | Season | Full Guide |
|---|---|---|---|---|
| Edmonton | Sept 23 | 4a | ~132 days | First frost details → · Planting calendar → |
| Calgary | Sept 21 | 3b | ~120 days | First frost details → · Planting calendar → |
| Winnipeg | Sept 20 | 3a | ~118 days | First frost details → · Planting calendar → |
| Regina | Sept 17 | 3b | ~119 days | First frost details → · Planting calendar → |
| Saskatoon | Sept 12 | 3b | ~110 days | First frost details → · Planting calendar → |
Ontario
| City | First Frost 2026 | Zone | Season | Full Guide |
|---|---|---|---|---|
| Toronto | Nov 1 | 6b | ~197 days | First frost details → · Planting calendar → |
| Mississauga | Oct 28 | 6b | ~190 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 → |
| Ottawa | Oct 12 | 5a | ~155 days | First frost details → · Planting calendar → |
| Barrie | Sept 24 | 5a | ~126 days | First frost details → · Planting calendar → |
| Sudbury | Sept 17 | 4b | ~108 days | First frost details → · Planting calendar → |
Quebec
| City | First Frost 2026 | Zone | Season | Full Guide |
|---|---|---|---|---|
| Montreal | Oct 7 | 5b | ~150 days | First frost details → · Planting calendar → |
| Quebec City | Sept 28 | 5a | ~134 days | First frost details → · Planting calendar → |
Atlantic Canada
| City | First Frost 2026 | Zone | Season | Full Guide |
|---|---|---|---|---|
| Halifax | Oct 18 | 6a | ~161 days | First frost details → · Planting calendar → |
| Charlottetown | Oct 14 | 6a | ~157 days | First frost details → · Planting calendar → |
| St. John's | Oct 13 | 5b | ~142 days | First frost details → · Planting calendar → |
| Saint John, NB | Oct 8 | 6a | ~153 days | First frost details → · Planting calendar → |
| Moncton | Sept 28 | 5b | ~136 days | First frost details → · Planting calendar → |
| Fredericton | Sept 26 | 5b | ~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.
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.
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.