Frost Dates for Walla Walla, WA

Based on data from Walla Walla Rgnl AP weather station, 3 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. March 27
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 31
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 April 5
First Fall Frost October 24

Hard Freeze (28°F)

Last Spring Hard Freeze March 4
First Fall Hard Freeze November 14
46.06°N, -118.34°W © OpenStreetMap

Growing Season

218 Days March 27 to October 31

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 7b

Avg. annual minimum: 5 to 10°F (−15 to −12°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Csa Hot-Summer Mediterranean

Hot, dry summers and mild, wet winters. Classic Mediterranean climate ideal for grapes, olives, tomatoes, and herbs. Summer irrigation is usually necessary.

Köppen climate map

Temperature

30° 50° 70° 90°
36°
High: 42°F
Avg: 36°F
Low: 31°F
Jan
40°
High: 47°F
Avg: 40°F
Low: 33°F
Feb
47°
High: 56°F
Avg: 47°F
Low: 38°F
Mar
53°
High: 63°F
Avg: 53°F
Low: 43°F
Apr
60°
High: 71°F
Avg: 60°F
Low: 49°F
May
67°
High: 79°F
Avg: 67°F
Low: 55°F
Jun
76°
High: 90°F
Avg: 76°F
Low: 62°F
Jul
75°
High: 89°F
Avg: 75°F
Low: 62°F
Aug
66°
High: 79°F
Avg: 66°F
Low: 54°F
Sep
54°
High: 63°F
Avg: 54°F
Low: 44°F
Oct
42°
High: 49°F
Avg: 42°F
Low: 36°F
Nov
36°
High: 41°F
Avg: 36°F
Low: 30°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 1" 2" 3" 3.3"
2.6"
2.65"
Jan
2.4"
2.36"
Feb
3.3"
3.28"
Mar
2.9"
2.93"
Apr
2.8"
2.76"
May
2.6"
2.63"
Jun
1.0"
0.99"
Jul
0.0"
0.00"
Aug
1.9"
1.95"
Sep
2.9"
2.92"
Oct
3.0"
2.98"
Nov
2.8"
2.79"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h15h15.5h15h14h12.5h10.5h9h8.5h
Jan: 7:35 AM – 4:25 PM · 8h 49m
Feb: 6:57 AM – 5:03 PM · 10h 06m
Mar: 6:12 AM – 5:48 PM · 11h 37m
Apr: 5:20 AM – 6:40 PM · 13h 19m
May: 4:37 AM – 7:23 PM · 14h 46m
Jun: 4:14 AM – 7:46 PM · 15h 33m
Jul: 4:23 AM – 7:37 PM · 15h 13m
Aug: 5:01 AM – 6:59 PM · 13h 58m
Sep: 5:51 AM – 6:09 PM · 12h 18m
Oct: 6:40 AM – 5:20 PM · 10h 39m
Nov: 7:25 AM – 4:35 PM · 9h 11m
Dec: 7:47 AM – 4:13 PM · 8h 27m
Daylight Longest: 15h 34m · Shortest: 8h 26m

Nearby Stations

Whitman Mission, WA May 2 - October 1 Milton Freewater, OR March 25 - October 29 Dayton 1 Wsw, WA April 28 - October 13 Ice Harbor Dam, WA April 7 - October 22 Pendleton Branch Exp Stn, OR May 12 - September 27 Pendleton Dwtn, OR April 22 - October 9

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