Frost Dates for Cowansville, QC

Based on data from Brome weather station, 9 miles away

Elevation: 117 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 23
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. September 16
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 27
First Fall Frost September 7

Hard Freeze (−2°C)

Last Spring Hard Freeze May 8
First Fall Hard Freeze October 8
45.20°N, -72.75°W © OpenStreetMap

Growing Season

116 Days May 23 to September 16

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 4a

Avg. annual minimum: −30 to −25°F (−34 to −32°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°
-10°
High: -5°C
Avg: -10°C
Low: -15°C
Jan
-9°
High: -3°C
Avg: -9°C
Low: -15°C
Feb
-3°
High: 3°C
Avg: -3°C
Low: -8°C
Mar
5°
High: 11°C
Avg: 5°C
Low: -1°C
Apr
12°
High: 19°C
Avg: 12°C
Low: 5°C
May
17°
High: 23°C
Avg: 17°C
Low: 11°C
Jun
19°
High: 25°C
Avg: 19°C
Low: 13°C
Jul
18°
High: 24°C
Avg: 18°C
Low: 12°C
Aug
14°
High: 20°C
Avg: 14°C
Low: 8°C
Sep
8°
High: 13°C
Avg: 8°C
Low: 2°C
Oct
1°
High: 6°C
Avg: 1°C
Low: -3°C
Nov
-6°
High: -1°C
Avg: -6°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
94 mm
94.0 mm
Jan
89 mm
88.9 mm
Feb
89 mm
88.9 mm
Mar
94 mm
94.0 mm
Apr
127 mm
127.0 mm
May
132 mm
132.1 mm
Jun
119 mm
119.4 mm
Jul
130 mm
129.5 mm
Aug
130 mm
129.5 mm
Sep
130 mm
129.5 mm
Oct
99 mm
99.1 mm
Nov
107 mm
106.7 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9.5h8.5h
Jan: 7:32 AM – 4:27 PM · 8h 55m
Feb: 6:60 AM – 5:10 PM · 10h 10m
Mar: 7:11 AM – 6:49 PM · 11h 37m
Apr: 6:12 AM – 7:29 PM · 13h 17m
May: 5:26 AM – 8:07 PM · 14h 40m
Jun: 5:08 AM – 8:33 PM · 15h 26m
Jul: 5:22 AM – 8:29 PM · 15h 07m
Aug: 5:57 AM – 7:52 PM · 13h 54m
Sep: 6:36 AM – 6:54 PM · 12h 18m
Oct: 7:15 AM – 5:56 PM · 10h 42m
Nov: 6:57 AM – 4:14 PM · 9h 16m
Dec: 7:29 AM – 4:03 PM · 8h 34m
Daylight Eastern Time (ET) Longest: 15h 27m · Shortest: 8h 33m

Nearby Stations

Sutton, QCMay 14 - October 1 Granby, QCMay 6 - October 7 Jay Peak, VTMay 14 - October 1 Frelighsburg, QC May 7 - October 10 Farnham, QCMay 9 - October 3 Bonsecours, QC May 20 - September 19

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