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Will it freeze in Toronto in the next 7 nights?
No overnight lows at or below 32°F are forecast in Toronto during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 47°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
2 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 47°F Above 36°F · Partly Cloudy
- Fri, Nov 6 39°F Above 36°F · Light Rain Likely
- Sat, Nov 7 37°F Above 36°F · Slight Chance Light Rain then Mostly Cloudy
- Sun, Nov 8 36°F Frost possible · Mostly Clear
- Mon, Nov 9 39°F Above 36°F · Mostly Clear
- Tue, Nov 10 36°F Frost possible · Mostly Clear
- Wed, Nov 11 37°F Above 36°F · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Toronto
The median first fall hard-freeze date (28°F) is November 6, from NOAA’s 1991–2020 Climate Normals at New Cumberland L/d. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Apr 20 · May 2 · May 20 | Oct 3 · Oct 17 · Oct 30 | 167 days |
| 32°F freeze | Apr 11 · Apr 22 · May 8 | Oct 13 · Oct 28 · Nov 10 | 186 days |
| 28°F hard freeze | Mar 30 · Apr 10 · Apr 21 | Oct 24 · Nov 6 · Nov 21 | 209 days |
Average high temperature by month
1991–2020 normals at New Cumberland L/d
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Toronto, OH come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: New Cumberland L/d (station USC00466442, elevation 675 ft), 4.8 mi from Toronto. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Toronto
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Weirton, WV | 4.3 mi | Apr 29 | Oct 20 |
| Steubenville, OH | 6.8 mi | Apr 29 | Oct 20 |
| East Liverpool, OH | 12 mi | Apr 22 | Oct 28 |
| Aliquippa, PA | 22 mi | Apr 8 | Nov 8 |
| Ambridge, PA | 22 mi | Apr 8 | Nov 8 |
| Monaca, PA | 24 mi | Apr 27 | Oct 25 |
| Coraopolis, PA | 24 mi | Apr 28 | Oct 18 |
| New Brighton, PA | 25 mi | Apr 27 | Oct 25 |
| Martins Ferry, OH | 25 mi | Apr 20 | Oct 29 |
| Economy, PA | 25 mi | Apr 8 | Nov 8 |
Frequently asked questions
When is the last frost in Toronto?
On average, the last spring frost (32°F) in Toronto is around April 22. In about 1 year in 10 it comes after May 8, and in 9 years in 10 it comes after April 11.
When is the first frost in Toronto?
The first fall frost (32°F) usually arrives around October 28. There’s a 10% chance of a freeze by October 13 and a 90% chance by November 10.
Can it frost in Toronto after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 2.
What growing zone is Toronto?
Toronto is in USDA Plant Hardiness Zone 6b (average annual extreme minimum temperature −5 to 0°F), based on the 2023 USDA map for ZIP code 43964. See growing zones in Ohio.
More: all Ohio frost dates · Ohio growing zones · frost vs. freeze