Frost Dates for St John, 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. April 29
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 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 May 5
First Fall Frost September 30

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze April 5
First Fall Hard Freeze October 20
47.09°N, -117.59°W © OpenStreetMap

Growing Season

158 Days April 29 to October 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 6b

Learn more

Temperature

20° 40° 60° 80°
33°
High: 37°
Avg: 33°
Low: 29°
Jan
36°
High: 41°
Avg: 36°
Low: 30°
Feb
42°
High: 49°
Avg: 42°
Low: 34°
Mar
48°
High: 57°
Avg: 48°
Low: 38°
Apr
56°
High: 66°
Avg: 56°
Low: 45°
May
61°
High: 73°
Avg: 61°
Low: 50°
Jun
69°
High: 84°
Avg: 69°
Low: 54°
Jul
68°
High: 84°
Avg: 68°
Low: 53°
Aug
60°
High: 74°
Avg: 60°
Low: 47°
Sep
49°
High: 59°
Avg: 49°
Low: 39°
Oct
39°
High: 44°
Avg: 39°
Low: 33°
Nov
32°
High: 35°
Avg: 32°
Low: 28°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 3" 3.4"
2.9"
2.89"
Jan
2.5"
2.47"
Feb
3.1"
3.07"
Mar
2.5"
2.47"
Apr
2.7"
2.68"
May
2.2"
2.23"
Jun
2.4"
2.41"
Jul
0.5"
0.48"
Aug
1.8"
1.83"
Sep
2.4"
2.42"
Oct
3.1"
3.06"
Nov
3.4"
3.37"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h15h16h15h14h12h11h9h8h
Jan: 7:39 AM – 4:21 PM · 8h 42m
Feb: 6:59 AM – 5:01 PM · 10h 02m
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 52m
Jun: 4:10 AM – 7:50 PM · 15h 41m
Jul: 4:20 AM – 7:40 PM · 15h 21m
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: 7:28 AM – 4:32 PM · 9h 05m
Dec: 7:51 AM – 4:09 PM · 8h 19m
Daylight Longest: 15h 43m · Shortest: 8h 18m

Nearby Stations

Rosalia, WAMay 7 - September 28 Spokane 17 Ssw, WA May 30 - September 4 Lacrosse, WAMay 13 - September 26 Pullman 2 Nw, WA May 6 - September 29 Pullman Moscow Rgnl AP, WA April 29 - October 2 Plummer 3 Wsw, ID May 11 - October 5

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