Frost Dates for Okanogan, WA

Based on data from Omak AP weather station, 8 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. April 30
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 7
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 6
First Fall Frost October 1

Hard Freeze (28°F)

Last Spring Hard Freeze April 14
First Fall Hard Freeze October 19
48.36°N, -119.58°W © OpenStreetMap

Growing Season

160 Days April 30 to October 7

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: 33°F
Avg: 28°F
Low: 23°F
Jan
33°
High: 40°F
Avg: 33°F
Low: 25°F
Feb
42°
High: 53°F
Avg: 42°F
Low: 31°F
Mar
50°
High: 63°F
Avg: 50°F
Low: 37°F
Apr
59°
High: 72°F
Avg: 59°F
Low: 45°F
May
65°
High: 79°F
Avg: 65°F
Low: 51°F
Jun
74°
High: 89°F
Avg: 74°F
Low: 58°F
Jul
73°
High: 89°F
Avg: 73°F
Low: 57°F
Aug
63°
High: 78°F
Avg: 63°F
Low: 48°F
Sep
49°
High: 61°F
Avg: 49°F
Low: 38°F
Oct
36°
High: 43°F
Avg: 36°F
Low: 29°F
Nov
28°
High: 33°F
Avg: 28°F
Low: 23°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 2.7"
2.4"
2.40"
Jan
1.7"
1.73"
Feb
2.3"
2.27"
Mar
1.8"
1.76"
Apr
2.3"
2.28"
May
1.7"
1.73"
Jun
0.8"
0.85"
Jul
0.0"
0.00"
Aug
1.4"
1.36"
Sep
2.7"
2.73"
Oct
2.4"
2.43"
Nov
2.6"
2.65"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h16h15.5h14h12.5h10.5h9h8h
Jan: 7:44 AM – 4:16 PM · 8h 31m
Feb: 7:02 AM – 4:58 PM · 9h 56m
Mar: 6:13 AM – 5:47 PM · 11h 35m
Apr: 5:17 AM – 6:43 PM · 13h 26m
May: 4:30 AM – 7:30 PM · 15h 01m
Jun: 4:04 AM – 7:56 PM · 15h 53m
Jul: 4:14 AM – 7:46 PM · 15h 31m
Aug: 4:56 AM – 7:04 PM · 14h 09m
Sep: 5:50 AM – 6:10 PM · 12h 20m
Oct: 6:44 AM – 5:16 PM · 10h 32m
Nov: 7:32 AM – 4:28 PM · 8h 55m
Dec: 7:57 AM – 4:03 PM · 8h 07m
Daylight Longest: 15h 55m · Shortest: 8h 06m

Nearby Stations

Tonasket 4 Nne, WA April 26 - October 10 Tonasket 11ne, WA May 6 - October 6 Winthrop 1 Wsw, WA May 15 - September 22 Chief Joseph Dam, WA April 26 - October 11 Methow 2 S, WA April 21 - October 15 Republic, WAMay 30 - September 10

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