Frost Dates for Portneuf, QC

Based on data from Deschambault weather station, 2 miles away

Elevation: 12 m

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. May 15
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 2
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.

Last Spring Frost May 19
First Fall Frost September 27

Hard Freeze (−2°C)

Last Spring Hard Freeze April 28
First Fall Hard Freeze October 16
46.69°N, -71.89°W © OpenStreetMap

Growing Season

140 Days May 15 to October 2

USDA Hardiness Zone iHardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.

Zone 4b

Avg. annual minimum: −25 to −20°F (−32 to −29°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Dfb Warm-Summer Continental

Warm summers and cold, snowy winters. A shorter growing season than hot-summer continental. Hardy vegetables, root crops, and cool-season greens do well. Season extension is valuable.

Köppen climate map

Temperature

-20° -5° 10° 25°
-12°
High: -7°C
Avg: -12°C
Low: -17°C
Jan
-11°
High: -5°C
Avg: -11°C
Low: -16°C
Feb
-4°
High: 1°C
Avg: -4°C
Low: -8°C
Mar
4°
High: 9°C
Avg: 4°C
Low: -1°C
Apr
12°
High: 18°C
Avg: 12°C
Low: 6°C
May
17°
High: 23°C
Avg: 17°C
Low: 11°C
Jun
20°
High: 25°C
Avg: 20°C
Low: 14°C
Jul
19°
High: 24°C
Avg: 19°C
Low: 13°C
Aug
14°
High: 19°C
Avg: 14°C
Low: 9°C
Sep
7°
High: 12°C
Avg: 7°C
Low: 3°C
Oct
1°
High: 4°C
Avg: 1°C
Low: -3°C
Nov
-7°
High: -3°C
Avg: -7°C
Low: -10°C
Dec
0°C
−2°C
Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)

Precipitation

0 mm 50 mm 100 mm 150 mm
79 mm
78.7 mm
Jan
71 mm
71.1 mm
Feb
64 mm
63.5 mm
Mar
86 mm
86.4 mm
Apr
91 mm
91.4 mm
May
104 mm
104.1 mm
Jun
130 mm
129.5 mm
Jul
112 mm
111.8 mm
Aug
112 mm
111.8 mm
Sep
124 mm
124.5 mm
Oct
84 mm
83.8 mm
Nov
89 mm
88.9 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h15h15.5h15.5h14h12.5h10.5h9h8.5h
Jan: 7:34 AM – 4:20 PM · 8h 45m
Feb: 7:00 AM – 5:04 PM · 10h 04m
Mar: 7:09 AM – 6:45 PM · 11h 36m
Apr: 6:07 AM – 7:28 PM · 13h 21m
May: 5:19 AM – 8:08 PM · 14h 49m
Jun: 4:59 AM – 8:37 PM · 15h 37m
Jul: 5:14 AM – 8:32 PM · 15h 18m
Aug: 5:52 AM – 7:52 PM · 14h 01m
Sep: 6:33 AM – 6:52 PM · 12h 19m
Oct: 7:14 AM – 5:52 PM · 10h 37m
Nov: 6:59 AM – 4:06 PM · 9h 07m
Dec: 7:32 AM – 3:55 PM · 8h 22m
Daylight Eastern Time (ET) Longest: 15h 39m · Shortest: 8h 21m

Nearby Stations

Deschambault, QC May 25 - September 14 St Alban, QCMay 17 - September 24 Ste Christine, QC May 23 - September 19 Fortierville, QC May 19 - September 22 Ste Anne De La Perade, QC May 15 - September 28 St Flavien, QC May 22 - September 20

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