Frost Dates for Chalk River Aecl, ON

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 14
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 5
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 18
First Fall Frost October 1

Hard Freeze (−2°C)

Last Spring Hard Freeze April 30
First Fall Hard Freeze October 25
46.05°N, -77.37°W © OpenStreetMap

Growing Season

144 Days May 14 to October 5

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°
-11°
High: -6°C
Avg: -11°C
Low: -16°C
Jan
-10°
High: -4°C
Avg: -10°C
Low: -15°C
Feb
-3°
High: 3°C
Avg: -3°C
Low: -9°C
Mar
5°
High: 11°C
Avg: 5°C
Low: -1°C
Apr
13°
High: 19°C
Avg: 13°C
Low: 6°C
May
18°
High: 24°C
Avg: 18°C
Low: 12°C
Jun
21°
High: 26°C
Avg: 21°C
Low: 15°C
Jul
19°
High: 25°C
Avg: 19°C
Low: 14°C
Aug
15°
High: 20°C
Avg: 15°C
Low: 10°C
Sep
8°
High: 12°C
Avg: 8°C
Low: 4°C
Oct
1°
High: 4°C
Avg: 1°C
Low: -3°C
Nov
-6°
High: -2°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 30 mm 60 mm 90 mm
64 mm
63.5 mm
Jan
36 mm
35.6 mm
Feb
58 mm
58.4 mm
Mar
64 mm
63.5 mm
Apr
86 mm
86.4 mm
May
94 mm
94.0 mm
Jun
94 mm
94.0 mm
Jul
94 mm
94.0 mm
Aug
81 mm
81.3 mm
Sep
81 mm
81.3 mm
Oct
74 mm
73.7 mm
Nov
53 mm
53.3 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h15h15.5h15h14h12.5h10.5h9h8.5h
Jan: 7:35 AM – 4:25 PM · 8h 49m
Feb: 6:57 AM – 5:03 PM · 10h 07m
Mar: 6:12 AM – 5:48 PM · 11h 37m
Apr: 5:20 AM – 6:40 PM · 13h 19m
May: 4:37 AM – 7:23 PM · 14h 45m
Jun: 4:14 AM – 7:46 PM · 15h 32m
Jul: 4:23 AM – 7:37 PM · 15h 13m
Aug: 5:01 AM – 6:59 PM · 13h 58m
Sep: 5:51 AM – 6:09 PM · 12h 18m
Oct: 6:40 AM – 5:20 PM · 10h 39m
Nov: 7:24 AM – 4:36 PM · 9h 11m
Dec: 7:46 AM – 4:14 PM · 8h 27m
Daylight Longest: 15h 34m · Shortest: 8h 26m

Nearby Stations

Sheenboro, QC May 26 - September 24 Petawawa Hoffman, ON May 13 - October 1 Rapide Des Joachims, QC May 16 - October 1 Charteris, QC May 22 - September 19 Shawville, QC May 18 - September 27 Wright, QCMay 23 - September 22

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