Frost Dates for Rosalia, WA
Elevation: 738 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 7
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 28
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 14
First Fall Frost
September 21
Hard Freeze (28°F)
Last Spring Hard Freeze
April 20
First Fall Hard Freeze
October 12
Growing Season
144 Days
May 7 to September 28
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 6b
Avg. annual minimum: −5 to 0°F
Köppen Climate
The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dsb
Warm-Summer Continental (Dry Summer)
Warm, dry summers and cold, snowy winters. Common in mountain regions. Moderate growing season with irrigation needs in summer.
Temperature
20°
40°
60°
80°
Avg High
Avg Temp
Avg Low
Light Frost (32°F)
Hard Frost (28°F)
Temperature table
| Month | Avg High | Avg Temp | Avg Low |
|---|---|---|---|
| January | 37° | 31° | 25° |
| February | 42° | 34° | 26° |
| March | 50° | 40° | 31° |
| April | 58° | 46° | 35° |
| May | 67° | 55° | 42° |
| June | 73° | 60° | 47° |
| July | 85° | 68° | 51° |
| August | 86° | 68° | 51° |
| September | 76° | 60° | 44° |
| October | 61° | 48° | 35° |
| November | 45° | 37° | 29° |
| December | 36° | 30° | 24° |
Precipitation
0"
2"
4"
4.7"
Precipitation table
| Month | Precipitation |
|---|---|
| January | 4.6 |
| February | 3.6 |
| March | 3.8 |
| April | 3.2 |
| May | 3.6 |
| June | 3.3 |
| July | 3.7 |
| August | 3.1 |
| September | 3.2 |
| October | 3.8 |
| November | 4.1 |
| December | 4.7 |
Sunrise / Sunset
Daylight
Longest: 15h 44m · Shortest: 8h 16m
Sunrise and sunset table
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:40 AM | 4:20 PM | 8h 41m |
| February | 6:59 AM | 5:01 PM | 10h 02m |
| March | 6:12 AM | 5:48 PM | 11h 36m |
| April | 5:19 AM | 6:41 PM | 13h 23m |
| May | 4:34 AM | 7:26 PM | 14h 53m |
| June | 4:09 AM | 7:51 PM | 15h 42m |
| July | 4:19 AM | 7:41 PM | 15h 22m |
| August | 4:58 AM | 7:02 PM | 14h 03m |
| September | 5:50 AM | 6:10 PM | 12h 19m |
| October | 6:42 AM | 5:18 PM | 10h 36m |
| November | 7:28 AM | 4:32 PM | 9h 04m |
| December | 7:51 AM | 4:09 PM | 8h 18m |
Nearby Stations
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