Frost Dates for Coaldale, AB

Based on data from Lethbridge Cda weather station, 7 miles away

Elevation: 865 m

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. May 12
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. September 24

30% Probability

Only 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 16
First Fall Frost September 18

Hard Freeze (−2°C)

Last Spring Hard Freeze April 28
First Fall Hard Freeze October 2
49.72°N, 112.62°W © OpenStreetMap

Growing Season

135 Days May 12 to September 24

USDA Hardiness Zone

Hardiness 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: −34 to −32°C

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)
Temperature table
Average monthly temperatures (°C)
Month Avg High Avg Temp Avg Low
January0°-5°-11°
February2°-4°-10°
March6°0°-6°
April12°6°-1°
May18°11°5°
June22°16°9°
July27°19°12°
August26°18°11°
September21°14°6°
October13°7°0°
November6°0°-6°
December0°-5°-11°

Precipitation

Precipitation table
Average monthly precipitation (millimeters)
MonthPrecipitation
January0
February0
March0
April5
May51
June89
July20
August15
September18
October5
November0
December0

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 16h 06m · Shortest: 7h 54m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January8:30 AM4:51 PM8h 21m
February7:50 AM5:41 PM9h 51m
March7:54 AM7:27 PM11h 33m
April6:46 AM8:16 PM13h 30m
May5:53 AM9:02 PM15h 09m
June5:29 AM9:33 PM16h 04m
July5:46 AM9:27 PM15h 42m
August6:28 AM8:43 PM14h 15m
September7:15 AM7:36 PM12h 21m
October8:02 AM6:30 PM10h 28m
November7:53 AM4:40 PM8h 47m
December8:29 AM4:25 PM7h 55m

Nearby Stations

Monarch, ABMay 25 - September 10 Vauxhall Cda Cs, AB May 14 - September 20 Cardston, ABMay 18 - September 19 Claresholm, AB May 20 - September 14 Brocket Agdm, AB May 14 - September 21 Del Bonita, MT May 28 - September 16

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