Frost Dates for Calmar, AB

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 20
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 15
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 23
First Fall Frost September 10

Hard Freeze (−2°C)

Last Spring Hard Freeze May 8
First Fall Hard Freeze September 25
53.28°N, -113.87°W © OpenStreetMap

Growing Season

118 Days May 20 to September 15

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 3a

Avg. annual minimum: −40 to −35°F (−40 to −37°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°
-12°
High: -7°C
Avg: -12°C
Low: -18°C
Jan
-8°
High: -2°C
Avg: -8°C
Low: -15°C
Feb
-4°
High: 2°C
Avg: -4°C
Low: -10°C
Mar
5°
High: 12°C
Avg: 5°C
Low: -2°C
Apr
11°
High: 18°C
Avg: 11°C
Low: 3°C
May
14°
High: 21°C
Avg: 14°C
Low: 8°C
Jun
17°
High: 24°C
Avg: 17°C
Low: 10°C
Jul
16°
High: 23°C
Avg: 16°C
Low: 8°C
Aug
11°
High: 18°C
Avg: 11°C
Low: 4°C
Sep
4°
High: 11°C
Avg: 4°C
Low: -2°C
Oct
-5°
High: 1°C
Avg: -5°C
Low: -10°C
Nov
-9°
High: -4°C
Avg: -9°C
Low: -15°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
23 mm
22.9 mm
Jan
8 mm
7.6 mm
Feb
15 mm
15.2 mm
Mar
20 mm
20.3 mm
Apr
56 mm
55.9 mm
May
84 mm
83.8 mm
Jun
97 mm
96.5 mm
Jul
58 mm
58.4 mm
Aug
43 mm
43.2 mm
Sep
28 mm
27.9 mm
Oct
8 mm
7.6 mm
Nov
0 mm
0.0 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8h9.5h11.5h13.5h15.5h16.5h16.5h14.5h12.5h10.5h8.5h7.5h
Jan: 8:06 AM – 3:54 PM · 7h 48m
Feb: 7:14 AM – 4:46 PM · 9h 32m
Mar: 6:15 AM – 5:45 PM · 11h 30m
Apr: 5:09 AM – 6:51 PM · 13h 43m
May: 4:11 AM – 7:49 PM · 15h 37m
Jun: 3:39 AM – 8:21 PM · 16h 42m
Jul: 3:52 AM – 8:08 PM · 16h 15m
Aug: 4:43 AM – 7:17 PM · 14h 34m
Sep: 5:48 AM – 6:12 PM · 12h 24m
Oct: 6:52 AM – 5:08 PM · 10h 15m
Nov: 7:51 AM – 4:09 PM · 8h 18m
Dec: 8:21 AM – 3:39 PM · 7h 17m
Daylight Longest: 16h 45m · Shortest: 7h 16m

Nearby Stations

Edmonton Woodbend, AB May 30 - September 12 Edmonton International Cs, AB May 26 - September 5 Edmonton Int'L A, AB May 25 - September 11 Edmonton Stony Plain, AB May 12 - September 22 Edmonton Stony Plain Cs, AB May 8 - September 23 University Of Alberta Metaboli, AB May 15 - September 20

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