Frost Dates for Winchester, OR

Elevation: 140 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. March 31
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. November 5

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 April 10
First Fall Frost October 28

Hard Freeze (28°F)

Last Spring Hard Freeze February 26
First Fall Hard Freeze December 1
43.28°N, 123.35°W © OpenStreetMap

Growing Season

219 Days March 31 to November 5

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 9a

Avg. annual minimum: 20 to 25°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Csb Warm-Summer Mediterranean

Warm, dry summers and mild, wet winters. Similar to hot-summer Mediterranean but cooler. Great for a wide range of vegetables and fruit trees with moderate water needs.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (32°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January50°42°35°
February54°45°35°
March59°48°37°
April64°52°40°
May71°58°45°
June77°64°50°
July86°70°55°
August86°70°54°
September81°65°49°
October68°55°43°
November56°47°38°
December49°42°35°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January4.7
February3.6
March4.2
April3.7
May3.6
June2.9
July0.0
August0.3
September3.1
October3.5
November4.2
December5.3

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 15h 13m · Shortest: 8h 47m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:49 AM4:57 PM9h 08m
February7:19 AM5:37 PM10h 17m
March7:34 AM7:12 PM11h 39m
April6:38 AM7:50 PM13h 12m
May5:55 AM8:24 PM14h 30m
June5:38 AM8:49 PM15h 12m
July5:52 AM8:46 PM14h 54m
August6:24 AM8:11 PM13h 47m
September6:60 AM7:16 PM12h 17m
October7:35 AM6:22 PM10h 47m
November7:15 AM4:42 PM9h 27m
December7:45 AM4:33 PM8h 48m

Nearby Stations

Roseburg Rgnl AP, OR March 19 - November 20 Roseburg Kqen, OR March 23 - November 18 Idleyld Park 4 Ne, OR April 27 - October 19 Riddle, ORMarch 31 - November 6 Elkton 3 Sw, OR March 21 - November 12 Drain, ORApril 16 - October 25

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