Frost Dates for Yellowknife, NT
Based on data from Yellowknife A weather station, 2 miles away
Elevation: 252 m
Frost Dates
Last Spring Frost (50%) A 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%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date.
September 22
30% Probability
Only 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 17
Hard Freeze (−2°C)
Last Spring Hard Freeze
May 18
First Fall Hard Freeze
October 4
Growing Season
122 Days
May 23 to September 22
USDA Hardiness Zone
Hardiness 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 2b
Avg. annual minimum: −43 to −40°C
Köppen Climate
The 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.
Temperature
-30°
-15°
0°
15°
Avg High
Avg Temp
Avg Low
Light Frost (0°C)
Hard Frost (−2°C)
Temperature table
| Month | Avg High | Avg Temp | Avg Low |
|---|---|---|---|
| January | -22° | -25° | -29° |
| February | -18° | -22° | -27° |
| March | -11° | -17° | -23° |
| April | 1° | -5° | -11° |
| May | 10° | 5° | 0° |
| June | 18° | 14° | 9° |
| July | 22° | 17° | 13° |
| August | 18° | 14° | 11° |
| September | 11° | 8° | 5° |
| October | 1° | -1° | -4° |
| November | -9° | -12° | -16° |
| December | -17° | -21° | -25° |
Precipitation
0 mm
20 mm
40 mm
Precipitation table
| Month | Precipitation |
|---|---|
| January | 0 |
| February | 0 |
| March | 3 |
| April | 0 |
| May | 3 |
| June | 18 |
| July | 28 |
| August | 38 |
| September | 43 |
| October | 15 |
| November | 10 |
| December | 0 |
Sunrise / Sunset
Daylight
Mountain Time (MT)
Longest: 19h 31m · Shortest: 4h 30m
Sunrise and sunset table
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 10:00 AM | 3:34 PM | 5h 34m |
| February | 8:40 AM | 5:05 PM | 8h 24m |
| March | 8:09 AM | 7:26 PM | 11h 17m |
| April | 6:24 AM | 8:52 PM | 14h 28m |
| May | 4:51 AM | 10:17 PM | 17h 26m |
| June | 3:55 AM | 11:21 PM | 19h 26m |
| July | 4:27 AM | 10:60 PM | 18h 33m |
| August | 5:50 AM | 9:34 PM | 15h 45m |
| September | 7:15 AM | 7:49 PM | 12h 34m |
| October | 8:39 AM | 6:07 PM | 9h 29m |
| November | 9:10 AM | 3:36 PM | 6h 26m |
| December | 10:17 AM | 2:50 PM | 4h 33m |
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