Lévis, Quebec, Canada

Frost dates for Lévis

The full distribution rather than a single date. Every figure below is a percentile of 30 years of daily minimum temperatures at this location, expressed as the date it fell on.

Median last spring frost

14 May

Half of years are later than this. Not a planting date.

Median first autumn frost

6 October

The far end of the outdoor season.

Frost-free season

145 days

Between those two dates in a median year.

Last and first frost by severity

Read a row as: in this fraction of years, the last frost of spring had already happened by this date. The 90% column is the cautious planting date; the 10% column is the gamble.

Light frost — nights at or below 0°C (32°F). Air temperature reaches freezing. Kills basil, beans and unhardened tomatoes; hardy crops shrug it off.
Frost 1 year in 10 Median 9 years in 10 Earliest Latest
Last of spring 6 May 14 May 25 May 29 Apr 29 May
First of autumn 24 Sep 6 Oct 22 Oct 19 Sep 26 Oct
Frost-free days 169 145 122 every year on record saw this
Moderate frost — nights at or below -2.2°C (28°F). Damages half-hardy plants and most blossom. This is the threshold that decides a fruit crop.
Frost 1 year in 10 Median 9 years in 10 Earliest Latest
Last of spring 26 Apr 6 May 18 May 23 Apr 23 May
First of autumn 7 Oct 24 Oct 1 Nov 29 Sep 3 Nov
Frost-free days 189 171 142 every year on record saw this
Hard frost — nights at or below -4.4°C (24.1°F). Ground freezes and even hardy crops check their growth. Effectively the end of the outdoor year.
Frost 1 year in 10 Median 9 years in 10 Earliest Latest
Last of spring 10 Apr 22 Apr 27 Apr 30 Mar 7 May
First of autumn 22 Oct 3 Nov 14 Nov 15 Oct 20 Nov
Frost-free days 218 195 178 every year on record saw this

Dates in the southern hemisphere are computed on a growing year that starts in July, which is why "last of spring" falls where it should rather than in the middle of the calendar.

Chance of frost, week by week

Jan Mar Apr Jul Sep Oct Dec
Chance of at least one air frost during each week of the year, measured across the full record. The flat stretch in the middle is your frost-free season.

Temperature through the year

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Mean monthly temperature across the record. Months shown in blue average at least one air frost.

Monthly means and average number of frost nights.
Month Mean low Mean high Frost nights
January -18.9°C -9.2°C 30.8
February -18°C -7.5°C 28.2
March -11.8°C -2.6°C 30.4
April -3.2°C 5.8°C 23.3
May 4.3°C 14.9°C 4.8
June 10.2°C 19.9°C 0
July 13.5°C 22.2°C 0
August 12.6°C 21.5°C 0
September 8.4°C 17.7°C 0.3
October 2.3°C 10.2°C 10
November -5°C 1.8°C 25.8
December -13.6°C -5.4°C 30.5

Turn these dates into a planting calendar →

Nearby

Compare with places close by

Québec Zone 4a 3 km Last frost 14 May First 6 Oct Trois-Rivières Zone 3b 116 km Last frost 12 May First 9 Oct Drummondville Zone 4a 143 km Last frost 9 May First 13 Oct Sherbrooke Zone 4a 166 km Last frost 10 May First 9 Oct Saguenay Zone 3a 180 km Last frost 13 May First 6 Oct Saint-Hyacinthe Zone 4a 189 km Last frost 7 May First 15 Oct Granby Zone 4a 197 km Last frost 9 May First 11 Oct Repentigny Zone 4a 211 km Last frost 1 May First 19 Oct

Seasonal context

Rainfall and the growing season in Lévis

July has the highest average precipitation (124 mm); February has the lowest (64 mm). Compare this pattern with the planting windows and your water supply.

Jan 66 mm
Feb 64 mm
Mar 72 mm
Apr 93 mm
May 95 mm
Jun 113 mm
Jul 124 mm
Aug 108 mm
Sep 108 mm
Oct 118 mm
Nov 90 mm
Dec 96 mm

During wetter months, check that beds and containers drain after heavy rain. During drier months, plan how you will keep seeds and new transplants watered. Monthly averages can hide long dry spells and intense storms; they do not show soil moisture, humidity or this week's weather.

Source: NASA POWER, corrected MERRA-2 precipitation, 2001–2020. Values are approximate monthly totals, including the water equivalent of snow, from the nearest 0.5° × 0.625° grid cell. This reference period differs from the temperature record. Rainfall provides context and does not change the calculated planting dates. Method and limitations.

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