Frost Dates for Kittitas, WA

Based on data from Ellensburg weather station, 6 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 8
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 2
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 14
First Fall Frost September 27

Hard Freeze (28°F)

Last Spring Hard Freeze April 23
First Fall Hard Freeze October 14
46.98°N, -120.42°W © OpenStreetMap

Growing Season

147 Days May 8 to October 2

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 6b

Avg. annual minimum: −5 to 0°F (−21 to −18°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

Köppen climate map

Temperature

20° 40° 60° 80°
28°
High: 35°F
Avg: 28°F
Low: 20°F
Jan
33°
High: 43°F
Avg: 33°F
Low: 22°F
Feb
40°
High: 52°F
Avg: 40°F
Low: 28°F
Mar
47°
High: 60°F
Avg: 47°F
Low: 34°F
Apr
56°
High: 69°F
Avg: 56°F
Low: 42°F
May
62°
High: 76°F
Avg: 62°F
Low: 48°F
Jun
69°
High: 85°F
Avg: 69°F
Low: 54°F
Jul
68°
High: 85°F
Avg: 68°F
Low: 52°F
Aug
60°
High: 76°F
Avg: 60°F
Low: 43°F
Sep
48°
High: 62°F
Avg: 48°F
Low: 34°F
Oct
36°
High: 46°F
Avg: 36°F
Low: 26°F
Nov
28°
High: 35°F
Avg: 28°F
Low: 20°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 2.4"
2.4"
2.41"
Jan
1.8"
1.75"
Feb
1.7"
1.69"
Mar
1.5"
1.50"
Apr
1.6"
1.65"
May
1.3"
1.25"
Jun
0.4"
0.36"
Jul
0.0"
0.00"
Aug
0.8"
0.75"
Sep
1.7"
1.69"
Oct
1.8"
1.80"
Nov
2.1"
2.13"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h15.5h15.5h14h12.5h10.5h9h8.5h
Jan: 7:39 AM – 4:21 PM · 8h 43m
Feb: 6:59 AM – 5:01 PM · 10h 03m
Mar: 6:12 AM – 5:48 PM · 11h 36m
Apr: 5:19 AM – 6:41 PM · 13h 22m
May: 4:34 AM – 7:26 PM · 14h 51m
Jun: 4:10 AM – 7:50 PM · 15h 40m
Jul: 4:20 AM – 7:40 PM · 15h 20m
Aug: 4:59 AM – 7:01 PM · 14h 02m
Sep: 5:50 AM – 6:10 PM · 12h 19m
Oct: 6:42 AM – 5:18 PM · 10h 36m
Nov: 7:27 AM – 4:33 PM · 9h 05m
Dec: 7:50 AM – 4:10 PM · 8h 20m
Daylight Longest: 15h 42m · Shortest: 8h 19m

Nearby Stations

Ellensburg Bowers Fld, WA April 28 - October 7 Selah 2 Ne, WAMay 5 - October 4 Cle Elum, WAMay 13 - September 25 Yakima #2, WAApril 8 - October 23 Yakima Air Terminal, WA May 8 - October 4 Wenatchee, WAApril 4 - October 28

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview