Frost Dates for Calgary Int'L Cs, Canada

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 17
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 23
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 21
First Fall Frost September 18

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze May 8
First Fall Hard Freeze October 3
51.12°N, -114.02°W © OpenStreetMap

Growing Season

129 Days May 17 to September 23

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 4b

Learn more

Temperature

0° 20° 40° 60° 80°
22°
High: 32°
Avg: 22°
Low: 11°
Jan
20°
High: 31°
Avg: 20°
Low: 10°
Feb
28°
High: 38°
Avg: 28°
Low: 18°
Mar
40°
High: 51°
Avg: 40°
Low: 28°
Apr
50°
High: 62°
Avg: 50°
Low: 38°
May
57°
High: 68°
Avg: 57°
Low: 46°
Jun
63°
High: 76°
Avg: 63°
Low: 51°
Jul
61°
High: 74°
Avg: 61°
Low: 49°
Aug
53°
High: 65°
Avg: 53°
Low: 41°
Sep
41°
High: 52°
Avg: 41°
Low: 30°
Oct
29°
High: 39°
Avg: 29°
Low: 19°
Nov
21°
High: 32°
Avg: 21°
Low: 11°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 3" 3.9"
0.0"
0.00"
Jan
0.0"
0.00"
Feb
0.1"
0.10"
Mar
0.7"
0.70"
Apr
1.5"
1.50"
May
3.9"
3.90"
Jun
2.0"
2.00"
Jul
1.8"
1.80"
Aug
1.1"
1.10"
Sep
0.2"
0.20"
Oct
0.2"
0.20"
Nov
0.0"
0.00"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8h10h12h14h15h16h16h14h12h10h9h8h
Jan: 7:55 AM – 4:05 PM · 8h 09m
Feb: 7:08 AM – 4:52 PM · 9h 44m
Mar: 6:14 AM – 5:46 PM · 11h 32m
Apr: 5:13 AM – 6:47 PM · 13h 35m
May: 4:20 AM – 7:40 PM · 15h 20m
Jun: 3:51 AM – 8:09 PM · 16h 18m
Jul: 4:03 AM – 7:57 PM · 15h 54m
Aug: 4:49 AM – 7:11 PM · 14h 22m
Sep: 5:49 AM – 6:11 PM · 12h 22m
Oct: 6:48 AM – 5:12 PM · 10h 23m
Nov: 7:42 AM – 4:18 PM · 8h 36m
Dec: 8:09 AM – 3:51 PM · 7h 41m
Daylight Longest: 16h 20m · Shortest: 7h 40m

Nearby Stations

Calgary Int'L A, Canada May 21 - September 17 Cop Upper, Canada May 18 - September 21 Springbank A, Canada June 6 - August 23 Okotoks, Canada May 23 - September 13 Madden, Canada May 26 - September 7 Kananaskis, Canada June 16 - August 15

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