Frost Dates for Windsor, QC

Based on data from Bromptonville weather station, 6 miles away

Elevation: 173 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 26
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 21

Hard Freeze (−2°C)

Last Spring Hard Freeze May 7
First Fall Hard Freeze October 12
45.57°N, -72.00°W © OpenStreetMap

Growing Season

126 Days May 23 to September 26

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: -16°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: 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: 20°C
Avg: 14°C
Low: 8°C
Sep
8°
High: 13°C
Avg: 8°C
Low: 3°C
Oct
2°
High: 6°C
Avg: 2°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
74 mm
73.7 mm
Jan
51 mm
50.8 mm
Feb
64 mm
63.5 mm
Mar
89 mm
88.9 mm
Apr
91 mm
91.4 mm
May
127 mm
127.0 mm
Jun
135 mm
134.6 mm
Jul
119 mm
119.4 mm
Aug
94 mm
94.0 mm
Sep
114 mm
114.3 mm
Oct
89 mm
88.9 mm
Nov
91 mm
91.4 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9h8.5h
Jan: 7:30 AM – 4:24 PM · 8h 53m
Feb: 6:58 AM – 5:07 PM · 10h 09m
Mar: 7:09 AM – 6:46 PM · 11h 37m
Apr: 6:09 AM – 7:27 PM · 13h 18m
May: 5:23 AM – 8:05 PM · 14h 42m
Jun: 5:04 AM – 8:32 PM · 15h 28m
Jul: 5:19 AM – 8:28 PM · 15h 09m
Aug: 5:54 AM – 7:50 PM · 13h 56m
Sep: 6:33 AM – 6:51 PM · 12h 18m
Oct: 7:13 AM – 5:53 PM · 10h 41m
Nov: 6:56 AM – 4:10 PM · 9h 15m
Dec: 7:28 AM – 3:60 PM · 8h 32m
Daylight Eastern Time (ET) Longest: 15h 29m · Shortest: 8h 31m

Nearby Stations

Lennoxville, QCMay 14 - October 1 Richmond, QCMay 19 - September 29 Bonsecours, QC May 20 - September 19 St Camille Wolfe, QC May 24 - September 13 Magog, QCMay 13 - October 1 Sawyerville Nord, QC May 19 - September 23

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