Frost Dates for Newdegate Research Station, WA

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. September 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. June 4
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 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°N, 118.84°W © OpenStreetMap

Growing Season

247 Days September 30 to June 4

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 9b

Avg. annual minimum: 25 to 30°F (−4 to −1°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

0° 10° 20° 30°
23°
High: 31°C
Avg: 23°C
Low: 14°C
Jan
22°
High: 31°C
Avg: 22°C
Low: 14°C
Feb
20°
High: 28°C
Avg: 20°C
Low: 13°C
Mar
17°
High: 24°C
Avg: 17°C
Low: 10°C
Apr
13°
High: 20°C
Avg: 13°C
Low: 7°C
May
11°
High: 17°C
Avg: 11°C
Low: 5°C
Jun
10°
High: 15°C
Avg: 10°C
Low: 4°C
Jul
10°
High: 16°C
Avg: 10°C
Low: 4°C
Aug
12°
High: 19°C
Avg: 12°C
Low: 5°C
Sep
15°
High: 24°C
Avg: 15°C
Low: 7°C
Oct
19°
High: 27°C
Avg: 19°C
Low: 10°C
Nov
21°
High: 30°C
Avg: 21°C
Low: 12°C
Dec
Avg High Avg Temp Avg Low

Precipitation

0 mm 20 mm 40 mm
20 mm
20.3 mm
Jan
15 mm
15.2 mm
Feb
20 mm
20.3 mm
Mar
10 mm
10.2 mm
Apr
28 mm
27.9 mm
May
25 mm
25.4 mm
Jun
48 mm
48.3 mm
Jul
41 mm
40.6 mm
Aug
25 mm
25.4 mm
Sep
13 mm
12.7 mm
Oct
20 mm
20.3 mm
Nov
15 mm
15.2 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec14h13h12h11h10.5h10h10h11h12h13h13.5h14h
Jan: 5:01 AM – 6:59 PM · 13h 58m
Feb: 5:25 AM – 6:35 PM · 13h 11m
Mar: 5:53 AM – 6:07 PM · 12h 15m
Apr: 6:25 AM – 5:35 PM · 11h 10m
May: 6:51 AM – 5:09 PM · 10h 17m
Jun: 7:05 AM – 4:55 PM · 9h 49m
Jul: 6:60 AM – 5:00 PM · 10h 01m
Aug: 6:37 AM – 5:23 PM · 10h 46m
Sep: 6:06 AM – 5:54 PM · 11h 48m
Oct: 5:35 AM – 6:25 PM · 12h 51m
Nov: 5:08 AM – 6:52 PM · 13h 45m
Dec: 4:55 AM – 7:05 PM · 14h 11m
Daylight Longest: 14h 11m · Shortest: 9h 49m

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

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