Frost Dates for Armstrong (Aut), 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. June 10
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. August 24
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 June 15
First Fall Frost August 16

Hard Freeze (−2°C)

Last Spring Hard Freeze May 27
First Fall Hard Freeze September 16
50.30°N, -88.90°W © OpenStreetMap

Growing Season

75 Days June 10 to August 24

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 2b

Avg. annual minimum: −45 to −40°F (−43 to −40°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

-25° -10° 5° 20°
-18°
High: -12°C
Avg: -18°C
Low: -25°C
Jan
-17°
High: -9°C
Avg: -17°C
Low: -24°C
Feb
-9°
High: 0°C
Avg: -9°C
Low: -17°C
Mar
0°
High: 7°C
Avg: 0°C
Low: -8°C
Apr
8°
High: 15°C
Avg: 8°C
Low: 0°C
May
14°
High: 21°C
Avg: 14°C
Low: 6°C
Jun
17°
High: 24°C
Avg: 17°C
Low: 10°C
Jul
15°
High: 23°C
Avg: 15°C
Low: 8°C
Aug
10°
High: 17°C
Avg: 10°C
Low: 4°C
Sep
3°
High: 8°C
Avg: 3°C
Low: -2°C
Oct
-5°
High: -1°C
Avg: -5°C
Low: -10°C
Nov
-15°
High: -9°C
Avg: -15°C
Low: -20°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
28 mm
27.9 mm
Jan
25 mm
25.4 mm
Feb
25 mm
25.4 mm
Mar
43 mm
43.2 mm
Apr
104 mm
104.1 mm
May
99 mm
99.1 mm
Jun
109 mm
109.2 mm
Jul
69 mm
68.6 mm
Aug
109 mm
109.2 mm
Sep
81 mm
81.3 mm
Oct
28 mm
27.9 mm
Nov
25 mm
25.4 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h16h16h14.5h12.5h10.5h8.5h8h
Jan: 7:52 AM – 4:08 PM · 8h 16m
Feb: 7:06 AM – 4:54 PM · 9h 48m
Mar: 6:14 AM – 5:46 PM · 11h 33m
Apr: 5:14 AM – 6:46 PM · 13h 32m
May: 4:23 AM – 7:37 PM · 15h 14m
Jun: 3:55 AM – 8:05 PM · 16h 10m
Jul: 4:07 AM – 7:53 PM · 15h 47m
Aug: 4:51 AM – 7:09 PM · 14h 17m
Sep: 5:49 AM – 6:11 PM · 12h 21m
Oct: 6:47 AM – 5:13 PM · 10h 26m
Nov: 7:39 AM – 4:21 PM · 8h 42m
Dec: 8:05 AM – 3:55 PM · 7h 50m
Daylight Longest: 16h 12m · Shortest: 7h 48m

Nearby Stations

Cameron Falls (Aut), ON May 27 - September 24

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