Frost Dates for Fort Simpson A, NT

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 24
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 6
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 29
First Fall Frost August 30

Hard Freeze (−2°C)

Last Spring Hard Freeze May 10
First Fall Hard Freeze September 22
61.77°N, -121.23°W © OpenStreetMap

Growing Season

105 Days May 24 to September 6

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 2a

Avg. annual minimum: −50 to −45°F (−46 to −43°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

-30° -15° 0° 15°
-24°
High: -20°C
Avg: -24°C
Low: -28°C
Jan
-19°
High: -14°C
Avg: -19°C
Low: -25°C
Feb
-13°
High: -7°C
Avg: -13°C
Low: -20°C
Mar
0°
High: 6°C
Avg: 0°C
Low: -7°C
Apr
9°
High: 16°C
Avg: 9°C
Low: 3°C
May
16°
High: 22°C
Avg: 16°C
Low: 9°C
Jun
18°
High: 24°C
Avg: 18°C
Low: 12°C
Jul
15°
High: 21°C
Avg: 15°C
Low: 9°C
Aug
9°
High: 14°C
Avg: 9°C
Low: 3°C
Sep
-1°
High: 2°C
Avg: -1°C
Low: -5°C
Oct
-14°
High: -11°C
Avg: -14°C
Low: -18°C
Nov
-22°
High: -18°C
Avg: -22°C
Low: -26°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
3 mm
2.5 mm
Feb
0 mm
0.0 mm
Mar
10 mm
10.2 mm
Apr
25 mm
25.4 mm
May
56 mm
55.9 mm
Jun
61 mm
61.0 mm
Jul
66 mm
66.0 mm
Aug
28 mm
27.9 mm
Sep
23 mm
22.9 mm
Oct
3 mm
2.5 mm
Nov
3 mm
2.5 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec6h8.5h11.5h14.5h17h19h18.5h15.5h12.5h9.5h6.5h5h
Jan: 9:06 AM – 2:54 PM · 5h 48m
Feb: 7:44 AM – 4:16 PM · 8h 31m
Mar: 6:21 AM – 5:39 PM · 11h 18m
Apr: 4:48 AM – 7:12 PM · 14h 24m
May: 3:23 AM – 8:37 PM · 17h 15m
Jun: 2:26 AM – 9:34 PM · 19h 07m
Jul: 2:51 AM – 9:09 PM · 18h 18m
Aug: 4:11 AM – 7:49 PM · 15h 37m
Sep: 5:43 AM – 6:17 PM · 12h 33m
Oct: 7:13 AM – 4:47 PM · 9h 33m
Nov: 8:41 AM – 3:19 PM · 6h 38m
Dec: 9:34 AM – 2:26 PM · 4h 52m
Daylight Longest: 19h 11m · Shortest: 4h 49m

Nearby Stations

Lindburg Landing, NT May 28 - September 4

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