Frost Dates for Red Earth, 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 30
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 2
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 4
First Fall Frost August 25

Hard Freeze (−2°C)

Last Spring Hard Freeze May 19
First Fall Hard Freeze September 20
56.55°N, -115.28°W © OpenStreetMap

Growing Season

95 Days May 30 to September 2

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.

Dfc Subarctic

Short, cool summers and long, very cold winters. Growing seasons of 3–4 months require fast-maturing varieties. Root vegetables, potatoes, and cold-hardy greens are the most reliable.

Köppen climate map

Temperature

-25° -10° 5° 20°
-14°
High: -9°C
Avg: -14°C
Low: -20°C
Jan
-12°
High: -4°C
Avg: -12°C
Low: -19°C
Feb
-6°
High: 1°C
Avg: -6°C
Low: -13°C
Mar
3°
High: 10°C
Avg: 3°C
Low: -4°C
Apr
10°
High: 17°C
Avg: 10°C
Low: 2°C
May
14°
High: 21°C
Avg: 14°C
Low: 7°C
Jun
16°
High: 23°C
Avg: 16°C
Low: 10°C
Jul
15°
High: 22°C
Avg: 15°C
Low: 8°C
Aug
10°
High: 16°C
Avg: 10°C
Low: 3°C
Sep
3°
High: 8°C
Avg: 3°C
Low: -3°C
Oct
-7°
High: -2°C
Avg: -7°C
Low: -12°C
Nov
-12°
High: -7°C
Avg: -12°C
Low: -18°C
Dec
0°C
−2°C
Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)

Precipitation

0 mm 20 mm 40 mm 60 mm
3 mm
2.5 mm
Jan
3 mm
2.5 mm
Feb
0 mm
0.0 mm
Mar
8 mm
7.6 mm
Apr
28 mm
27.9 mm
May
69 mm
68.6 mm
Jun
61 mm
61.0 mm
Jul
51 mm
50.8 mm
Aug
30 mm
30.5 mm
Sep
8 mm
7.6 mm
Oct
5 mm
5.1 mm
Nov
0 mm
0.0 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec7h9h11.5h14h16h17.5h17h15h12.5h10h8h6.5h
Jan: 8:24 AM – 3:36 PM · 7h 11m
Feb: 7:24 AM – 4:36 PM · 9h 12m
Mar: 6:17 AM – 5:43 PM · 11h 26m
Apr: 5:02 AM – 6:58 PM · 13h 56m
May: 3:56 AM – 8:04 PM · 16h 08m
Jun: 3:17 AM – 8:43 PM · 17h 26m
Jul: 3:33 AM – 8:27 PM · 16h 53m
Aug: 4:33 AM – 7:27 PM · 14h 54m
Sep: 5:47 AM – 6:13 PM · 12h 27m
Oct: 6:59 AM – 5:01 PM · 10h 01m
Nov: 8:07 AM – 3:53 PM · 7h 46m
Dec: 8:43 AM – 3:17 PM · 6h 34m
Daylight Longest: 17h 28m · Shortest: 6h 32m

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