Frost Dates for Onefour Cda, 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 14
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 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 May 18
First Fall Frost September 20

Hard Freeze (−2°C)

Last Spring Hard Freeze May 6
First Fall Hard Freeze October 1
49.12°N, -110.47°W © OpenStreetMap

Growing Season

133 Days May 14 to September 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 4a

Avg. annual minimum: −30 to −25°F (−34 to −32°C)

Learn more

Köppen Climate iThe 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

-15° 0° 15° 30°
-9°
High: -3°C
Avg: -9°C
Low: -14°C
Jan
-7°
High: -1°C
Avg: -7°C
Low: -13°C
Feb
-2°
High: 4°C
Avg: -2°C
Low: -8°C
Mar
5°
High: 12°C
Avg: 5°C
Low: -1°C
Apr
11°
High: 18°C
Avg: 11°C
Low: 4°C
May
16°
High: 22°C
Avg: 16°C
Low: 9°C
Jun
20°
High: 28°C
Avg: 20°C
Low: 12°C
Jul
19°
High: 27°C
Avg: 19°C
Low: 11°C
Aug
14°
High: 21°C
Avg: 14°C
Low: 6°C
Sep
6°
High: 13°C
Avg: 6°C
Low: -1°C
Oct
-2°
High: 4°C
Avg: -2°C
Low: -8°C
Nov
-8°
High: -2°C
Avg: -8°C
Low: -13°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
0 mm
0.0 mm
Jan
0 mm
0.0 mm
Feb
0 mm
0.0 mm
Mar
3 mm
2.5 mm
Apr
33 mm
33.0 mm
May
64 mm
63.5 mm
Jun
25 mm
25.4 mm
Jul
18 mm
17.8 mm
Aug
18 mm
17.8 mm
Sep
5 mm
5.1 mm
Oct
5 mm
5.1 mm
Nov
0 mm
0.0 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h16h15.5h14h12.5h10.5h9h8h
Jan: 7:47 AM – 4:13 PM · 8h 26m
Feb: 7:03 AM – 4:57 PM · 9h 53m
Mar: 6:13 AM – 5:47 PM · 11h 34m
Apr: 5:16 AM – 6:44 PM · 13h 28m
May: 4:27 AM – 7:33 PM · 15h 05m
Jun: 4:01 AM – 7:59 PM · 15h 59m
Jul: 4:12 AM – 7:48 PM · 15h 37m
Aug: 4:54 AM – 7:06 PM · 14h 12m
Sep: 5:50 AM – 6:10 PM · 12h 21m
Oct: 6:45 AM – 5:15 PM · 10h 30m
Nov: 7:35 AM – 4:25 PM · 8h 51m
Dec: 7:60 AM – 4:00 PM · 8h 01m
Daylight Longest: 16h 01m · Shortest: 7h 60m

Nearby Stations

Simpson 6 N - Wildhorse, MT May 26 - September 15 Rudyard 21 N, MT May 30 - September 11 Gildford, MTMay 24 - September 15 Joplin, MTMay 21 - September 19 Goldbutte 7 N, MT Chester, MTMay 24 - September 17

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