Frost Dates for Iliamna AP, AK
Elevation: 44 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 10
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.
October 1
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 16
First Fall Frost
September 26
Hard Freeze (28°F)
Last Spring Hard Freeze
April 28
First Fall Hard Freeze
October 10
Growing Season
144 Days
May 10 to October 1
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 4b
Avg. annual minimum: −25 to −20°F
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
10°
30°
50°
70°
Avg High
Avg Temp
Avg Low
Light Frost (32°F)
Hard Frost (28°F)
Temperature table
| Month | Avg High | Avg Temp | Avg Low |
|---|---|---|---|
| January | 25° | 18° | 12° |
| February | 30° | 23° | 16° |
| March | 32° | 24° | 16° |
| April | 43° | 36° | 29° |
| May | 55° | 46° | 38° |
| June | 62° | 54° | 45° |
| July | 65° | 58° | 51° |
| August | 64° | 57° | 50° |
| September | 56° | 50° | 43° |
| October | 45° | 39° | 32° |
| November | 33° | 27° | 21° |
| December | 28° | 22° | 15° |
Precipitation
0"
2"
4"
4.8"
Precipitation table
| Month | Precipitation |
|---|---|
| January | 1.9 |
| February | 1.7 |
| March | 1.9 |
| April | 1.9 |
| May | 2.0 |
| June | 2.5 |
| July | 3.9 |
| August | 4.4 |
| September | 4.8 |
| October | 4.2 |
| November | 3.0 |
| December | 2.3 |
Sunrise / Sunset
Daylight
Longest: 18h 24m · Shortest: 5h 36m
Sunrise and sunset table
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 8:47 AM | 3:13 PM | 6h 25m |
| February | 7:36 AM | 4:24 PM | 8h 49m |
| March | 6:19 AM | 5:41 PM | 11h 21m |
| April | 4:54 AM | 7:06 PM | 14h 12m |
| May | 3:37 AM | 8:23 PM | 16h 46m |
| June | 2:49 AM | 9:11 PM | 18h 21m |
| July | 3:10 AM | 8:50 PM | 17h 40m |
| August | 4:20 AM | 7:40 PM | 15h 19m |
| September | 5:45 AM | 6:15 PM | 12h 30m |
| October | 7:07 AM | 4:53 PM | 9h 45m |
| November | 8:26 AM | 3:34 PM | 7h 08m |
| December | 9:11 AM | 2:49 PM | 5h 38m |
Nearby Stations
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