Frost Dates for High Level A, 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 6
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 30

Hard Freeze (−2°C)

Last Spring Hard Freeze May 15
First Fall Hard Freeze September 18
58.62°N, -117.17°W © OpenStreetMap

Growing Season

99 Days May 30 to September 6

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.

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°
-20°
High: -15°C
Avg: -20°C
Low: -25°C
Jan
-16°
High: -10°C
Avg: -16°C
Low: -22°C
Feb
-9°
High: -3°C
Avg: -9°C
Low: -16°C
Mar
2°
High: 8°C
Avg: 2°C
Low: -5°C
Apr
9°
High: 17°C
Avg: 9°C
Low: 2°C
May
15°
High: 22°C
Avg: 15°C
Low: 8°C
Jun
17°
High: 23°C
Avg: 17°C
Low: 10°C
Jul
15°
High: 22°C
Avg: 15°C
Low: 8°C
Aug
9°
High: 15°C
Avg: 9°C
Low: 3°C
Sep
1°
High: 6°C
Avg: 1°C
Low: -4°C
Oct
-11°
High: -7°C
Avg: -11°C
Low: -16°C
Nov
-18°
High: -13°C
Avg: -18°C
Low: -23°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 80 mm
3 mm
2.5 mm
Jan
0 mm
0.0 mm
Feb
5 mm
5.1 mm
Mar
5 mm
5.1 mm
Apr
20 mm
20.3 mm
May
58 mm
58.4 mm
Jun
79 mm
78.7 mm
Jul
38 mm
38.1 mm
Aug
25 mm
25.4 mm
Sep
3 mm
2.5 mm
Oct
3 mm
2.5 mm
Nov
5 mm
5.1 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec6.5h9h11.5h14h16.5h18h17.5h15h12.5h10h7.5h6h
Jan: 8:39 AM – 3:21 PM · 6h 43m
Feb: 7:31 AM – 4:29 PM · 8h 58m
Mar: 6:19 AM – 5:41 PM · 11h 23m
Apr: 4:57 AM – 7:03 PM · 14h 06m
May: 3:44 AM – 8:16 PM · 16h 31m
Jun: 3:00 AM – 8:60 PM · 17h 60m
Jul: 3:19 AM – 8:41 PM · 17h 22m
Aug: 4:25 AM – 7:35 PM · 15h 10m
Sep: 5:45 AM – 6:15 PM · 12h 29m
Oct: 7:04 AM – 4:56 PM · 9h 51m
Nov: 8:19 AM – 3:41 PM · 7h 22m
Dec: 9:00 AM – 2:60 PM · 5h 60m
Daylight Longest: 18h 03m · Shortest: 5h 58m

Nearby Stations

Fort Vermilion, AB May 17 - September 18

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