Frost Dates for Greater Sudbury, Canada

Based on data from Sudbury A weather station, 13 miles away

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 16
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 1
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 21
First Fall Frost September 26

Hard Freeze (−2°C)

Last Spring Hard Freeze April 30
First Fall Hard Freeze October 10
46.49°N, -80.99°W © OpenStreetMap

Growing Season

138 Days May 16 to October 1

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°
-13°
High: -8°C
Avg: -13°C
Low: -18°C
Jan
-11°
High: -5°C
Avg: -11°C
Low: -16°C
Feb
-4°
High: 1°C
Avg: -4°C
Low: -10°C
Mar
4°
High: 9°C
Avg: 4°C
Low: -2°C
Apr
11°
High: 17°C
Avg: 11°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: 13°C
Aug
13°
High: 18°C
Avg: 13°C
Low: 8°C
Sep
6°
High: 10°C
Avg: 6°C
Low: 2°C
Oct
-1°
High: 3°C
Avg: -1°C
Low: -4°C
Nov
-8°
High: -4°C
Avg: -8°C
Low: -12°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
71 mm
71.1 mm
Jan
53 mm
53.3 mm
Feb
61 mm
61.0 mm
Mar
69 mm
68.6 mm
Apr
84 mm
83.8 mm
May
79 mm
78.7 mm
Jun
81 mm
81.3 mm
Jul
84 mm
83.8 mm
Aug
107 mm
106.7 mm
Sep
91 mm
91.4 mm
Oct
74 mm
73.7 mm
Nov
64 mm
63.5 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h15h15.5h15.5h14h12.5h10.5h9h8.5h
Jan: 7:37 AM – 4:23 PM · 8h 45m
Feb: 6:58 AM – 5:02 PM · 10h 04m
Mar: 6:12 AM – 5:48 PM · 11h 36m
Apr: 5:20 AM – 6:40 PM · 13h 21m
May: 4:36 AM – 7:24 PM · 14h 49m
Jun: 4:11 AM – 7:49 PM · 15h 37m
Jul: 4:21 AM – 7:39 PM · 15h 17m
Aug: 4:60 AM – 7:00 PM · 14h 00m
Sep: 5:51 AM – 6:09 PM · 12h 19m
Oct: 6:41 AM – 5:19 PM · 10h 37m
Nov: 7:26 AM – 4:34 PM · 9h 07m
Dec: 7:49 AM – 4:11 PM · 8h 23m
Daylight Longest: 15h 39m · Shortest: 8h 21m

Nearby Stations

Monetville, ON May 21 - September 23 Killarney (Aut), ON April 28 - October 23 North Bay A, ON May 15 - September 29 Barrage Temiscamingue, QC May 16 - October 10 Powassan, ONMay 26 - September 18 Dunchurch, ON May 28 - September 18

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