Frost Dates for Fort William, Canada

Based on data from St John'S A weather station, 4 miles away

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 26
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. October 18
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 1
First Fall Frost October 14

Hard Freeze (−2°C)

Last Spring Hard Freeze May 7
First Fall Hard Freeze November 8
47.57°N, -52.70°W © OpenStreetMap

Growing Season

145 Days May 26 to October 18

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 7a

Avg. annual minimum: 0 to 5°F (−18 to −15°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

-10° 0° 10° 20°
-4°
High: -1°C
Avg: -4°C
Low: -8°C
Jan
-5°
High: -1°C
Avg: -5°C
Low: -8°C
Feb
-2°
High: 1°C
Avg: -2°C
Low: -6°C
Mar
2°
High: 5°C
Avg: 2°C
Low: -2°C
Apr
6°
High: 11°C
Avg: 6°C
Low: 2°C
May
11°
High: 16°C
Avg: 11°C
Low: 6°C
Jun
16°
High: 21°C
Avg: 16°C
Low: 11°C
Jul
16°
High: 21°C
Avg: 16°C
Low: 12°C
Aug
13°
High: 17°C
Avg: 13°C
Low: 8°C
Sep
8°
High: 11°C
Avg: 8°C
Low: 4°C
Oct
3°
High: 7°C
Avg: 3°C
Low: 0°C
Nov
-1°
High: 2°C
Avg: -1°C
Low: -4°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 150 mm 200 mm
152 mm
152.4 mm
Jan
117 mm
116.8 mm
Feb
137 mm
137.2 mm
Mar
122 mm
121.9 mm
Apr
104 mm
104.1 mm
May
86 mm
86.4 mm
Jun
89 mm
88.9 mm
Jul
99 mm
99.1 mm
Aug
127 mm
127.0 mm
Sep
168 mm
167.6 mm
Oct
157 mm
157.5 mm
Nov
183 mm
182.9 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h16h15.5h14h12.5h10.5h9h8h
Jan: 7:41 AM – 4:19 PM · 8h 38m
Feb: 6:60 AM – 5:00 PM · 10h 00m
Mar: 6:12 AM – 5:48 PM · 11h 35m
Apr: 5:18 AM – 6:42 PM · 13h 24m
May: 4:32 AM – 7:28 PM · 14h 55m
Jun: 4:07 AM – 7:53 PM · 15h 45m
Jul: 4:18 AM – 7:42 PM · 15h 25m
Aug: 4:58 AM – 7:02 PM · 14h 05m
Sep: 5:50 AM – 6:10 PM · 12h 19m
Oct: 6:43 AM – 5:17 PM · 10h 35m
Nov: 7:29 AM – 4:31 PM · 9h 01m
Dec: 7:53 AM – 4:07 PM · 8h 14m
Daylight Longest: 15h 47m · Shortest: 8h 13m

Nearby Stations

Holyrood Gen Stn, Canada June 5 - October 10 Butlerville, Canada June 13 - September 21 Whitbourne, Canada June 9 - September 23 Goobies, Canada June 12 - September 2 Argentia (Aut), Canada May 4 - November 8 Cape Race (Aut), Canada May 28 - October 17

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