Frost Dates for West Richland, WA

Based on data from Richland weather station, 5 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. April 6
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 24
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 13
First Fall Frost October 18

Hard Freeze (28°F)

Last Spring Hard Freeze March 18
First Fall Hard Freeze November 4
46.30°N, -119.36°W © OpenStreetMap

Growing Season

201 Days April 6 to October 24

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.

BWk Cold Desert

Dry with hot summers and cold winters. Rainfall is minimal year-round. Short growing seasons and large temperature swings require careful timing. Cold-hardy, drought-tolerant plants are best suited.

Köppen climate map

Temperature

20° 40° 60° 80°
35°
High: 41°F
Avg: 35°F
Low: 29°F
Jan
39°
High: 48°F
Avg: 39°F
Low: 30°F
Feb
46°
High: 57°F
Avg: 46°F
Low: 35°F
Mar
53°
High: 65°F
Avg: 53°F
Low: 41°F
Apr
61°
High: 74°F
Avg: 61°F
Low: 48°F
May
67°
High: 80°F
Avg: 67°F
Low: 54°F
Jun
75°
High: 89°F
Avg: 75°F
Low: 60°F
Jul
74°
High: 88°F
Avg: 74°F
Low: 59°F
Aug
65°
High: 79°F
Avg: 65°F
Low: 51°F
Sep
53°
High: 64°F
Avg: 53°F
Low: 42°F
Oct
41°
High: 49°F
Avg: 41°F
Low: 34°F
Nov
34°
High: 40°F
Avg: 34°F
Low: 28°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 1.5"
1.4"
1.38"
Jan
1.1"
1.12"
Feb
1.2"
1.24"
Mar
1.2"
1.20"
Apr
1.5"
1.51"
May
1.5"
1.50"
Jun
0.1"
0.05"
Jul
0.0"
0.00"
Aug
0.7"
0.67"
Sep
1.5"
1.50"
Oct
1.2"
1.20"
Nov
1.3"
1.33"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h15h15.5h15.5h14h12.5h10.5h9h8.5h
Jan: 7:36 AM – 4:24 PM · 8h 48m
Feb: 6:57 AM – 5:03 PM · 10h 05m
Mar: 6:12 AM – 5:48 PM · 11h 36m
Apr: 5:20 AM – 6:40 PM · 13h 20m
May: 4:37 AM – 7:23 PM · 14h 47m
Jun: 4:13 AM – 7:47 PM · 15h 35m
Jul: 4:22 AM – 7:38 PM · 15h 15m
Aug: 5:00 AM – 6:60 PM · 13h 59m
Sep: 5:51 AM – 6:09 PM · 12h 19m
Oct: 6:41 AM – 5:19 PM · 10h 38m
Nov: 7:25 AM – 4:35 PM · 9h 09m
Dec: 7:47 AM – 4:13 PM · 8h 25m
Daylight Longest: 15h 36m · Shortest: 8h 24m

Nearby Stations

Pasco Tri Cities AP, WA April 27 - October 11 Eltopia 8 Wsw, WA April 21 - October 22 Kennewick, WA March 28 - October 30 Sagemoor, WAApril 30 - October 13 Ice Harbor Dam, WA April 7 - October 22 Prosser, WAApril 14 - October 22

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