Frost Dates for Somerset, AB

Based on data from Okotoks weather station, 12 miles away

Elevation: 1081 m

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 23
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 13
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 28
First Fall Frost September 8

Hard Freeze (−2°C)

Last Spring Hard Freeze May 6
First Fall Hard Freeze September 27
50.90°N, -114.09°W © OpenStreetMap

Growing Season

113 Days May 23 to September 13

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.

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

-15° -5° 5° 15° 25°
-7°
High: -2°C
Avg: -7°C
Low: -13°C
Jan
-6°
High: 0°C
Avg: -6°C
Low: -12°C
Feb
-1°
High: 5°C
Avg: -1°C
Low: -8°C
Mar
5°
High: 11°C
Avg: 5°C
Low: -2°C
Apr
10°
High: 17°C
Avg: 10°C
Low: 3°C
May
14°
High: 21°C
Avg: 14°C
Low: 7°C
Jun
17°
High: 25°C
Avg: 17°C
Low: 10°C
Jul
17°
High: 24°C
Avg: 17°C
Low: 9°C
Aug
12°
High: 19°C
Avg: 12°C
Low: 4°C
Sep
5°
High: 12°C
Avg: 5°C
Low: -1°C
Oct
-2°
High: 4°C
Avg: -2°C
Low: -8°C
Nov
-7°
High: -1°C
Avg: -7°C
Low: -12°C
Dec
0°C
−2°C
Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)

Precipitation

0 mm 50 mm 100 mm
3 mm
2.5 mm
Jan
0 mm
0.0 mm
Feb
10 mm
10.2 mm
Mar
41 mm
40.6 mm
Apr
79 mm
78.7 mm
May
117 mm
116.8 mm
Jun
56 mm
55.9 mm
Jul
51 mm
50.8 mm
Aug
48 mm
48.3 mm
Sep
10 mm
10.2 mm
Oct
8 mm
7.6 mm
Nov
3 mm
2.5 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8h10h11.5h13.5h15.5h16h16h14.5h12.5h10.5h8.5h8h
Jan: 8:39 AM – 4:51 PM · 8h 13m
Feb: 7:58 AM – 5:43 PM · 9h 46m
Mar: 7:59 AM – 7:32 PM · 11h 32m
Apr: 6:49 AM – 8:23 PM · 13h 34m
May: 5:54 AM – 9:10 PM · 15h 17m
Jun: 5:29 AM – 9:43 PM · 16h 15m
Jul: 5:46 AM – 9:37 PM · 15h 51m
Aug: 6:30 AM – 8:50 PM · 14h 20m
Sep: 7:20 AM – 7:41 PM · 12h 22m
Oct: 8:09 AM – 6:33 PM · 10h 24m
Nov: 8:02 AM – 4:40 PM · 8h 39m
Dec: 8:39 AM – 4:24 PM · 7h 45m
Daylight Mountain Time (MT) Longest: 16h 16m · Shortest: 7h 44m

Nearby Stations

Cop Upper, AB May 18 - September 21 Calgary Int'L A, AB May 21 - September 17 Calgary Int'L Cs, AB May 17 - September 23 Springbank A, AB June 6 - August 23 Pekisko, ABJune 9 - August 16 Stavely Aafc, AB May 18 - September 23

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