Frost Dates for Newdegate Research Station, WA

Elevation: 320 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. September 30
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. June 4

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 October 12
First Fall Frost May 28

Hard Freeze (−2°C)

Last Spring Hard Freeze August 30
First Fall Hard Freeze June 17
33.11°S, 118.84°E © OpenStreetMap

Growing Season

247 Days September 30 to June 4

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 9b

Avg. annual minimum: −4 to −1°C

Learn more

Köppen Climate

The 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

Avg High Avg Temp Avg Low
Temperature table
Average monthly temperatures (°C)
Month Avg High Avg Temp Avg Low
January31°23°14°
February31°22°14°
March28°20°13°
April24°17°10°
May20°13°7°
June17°11°5°
July15°10°4°
August16°10°4°
September19°12°5°
October24°15°7°
November27°19°10°
December30°21°12°

Precipitation

Precipitation table
Average monthly precipitation (millimeters)
MonthPrecipitation
January20
February15
March20
April10
May28
June25
July48
August41
September25
October13
November20
December15

Sunrise / Sunset

Daylight Longest: 14h 11m · Shortest: 9h 49m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January5:01 AM6:59 PM13h 58m
February5:25 AM6:35 PM13h 11m
March5:53 AM6:07 PM12h 15m
April6:25 AM5:35 PM11h 10m
May6:51 AM5:09 PM10h 17m
June7:05 AM4:55 PM9h 49m
July6:60 AM5:00 PM10h 01m
August6:37 AM5:23 PM10h 46m
September6:06 AM5:54 PM11h 48m
October5:35 AM6:25 PM12h 51m
November5:08 AM6:52 PM13h 45m
December4:55 AM7:05 PM14h 11m

Nearby Stations

Lake Grace, WAAugust 24 - June 19 Lake Grace Comparison, WA Hyden, WASeptember 6 - June 5 Jacup, WA Ongerup, WA Narembeen, WAAugust 23 - June 10

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