Frost Dates for Asotin, WA

Based on data from Lewiston Nez Perce Co AP weather station, 3 miles away

Elevation: 801 ft

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 26
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 14
First Fall Frost October 18

Hard Freeze (28°F)

Last Spring Hard Freeze March 15
First Fall Hard Freeze November 8
46.34°N, -117.05°W © OpenStreetMap

Growing Season

203 Days April 6 to October 26

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.

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

20° 40° 60° 80° 100°
36°
High: 42°F
Avg: 36°F
Low: 30°F
Jan
39°
High: 47°F
Avg: 39°F
Low: 32°F
Feb
45°
High: 55°F
Avg: 45°F
Low: 36°F
Mar
52°
High: 62°F
Avg: 52°F
Low: 41°F
Apr
60°
High: 72°F
Avg: 60°F
Low: 48°F
May
67°
High: 79°F
Avg: 67°F
Low: 54°F
Jun
76°
High: 91°F
Avg: 76°F
Low: 61°F
Jul
75°
High: 90°F
Avg: 75°F
Low: 60°F
Aug
66°
High: 80°F
Avg: 66°F
Low: 52°F
Sep
53°
High: 63°F
Avg: 53°F
Low: 42°F
Oct
42°
High: 49°F
Avg: 42°F
Low: 35°F
Nov
35°
High: 41°F
Avg: 35°F
Low: 30°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 3" 3.2"
1.7"
1.71"
Jan
1.7"
1.68"
Feb
1.9"
1.90"
Mar
2.4"
2.37"
Apr
3.2"
3.18"
May
2.6"
2.57"
Jun
1.5"
1.48"
Jul
1.9"
1.85"
Aug
2.1"
2.07"
Sep
2.1"
2.08"
Oct
1.9"
1.95"
Nov
1.9"
1.86"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h15h15.5h15.5h14h12.5h10.5h9h8.5h
Jan: 7:34 AM – 4:21 PM · 8h 47m
Feb: 7:00 AM – 5:05 PM · 10h 05m
Mar: 7:10 AM – 6:46 PM · 11h 36m
Apr: 6:08 AM – 7:28 PM · 13h 20m
May: 5:21 AM – 8:08 PM · 14h 47m
Jun: 5:01 AM – 8:36 PM · 15h 35m
Jul: 5:16 AM – 8:31 PM · 15h 15m
Aug: 5:53 AM – 7:52 PM · 13h 59m
Sep: 6:33 AM – 6:52 PM · 12h 19m
Oct: 7:14 AM – 5:52 PM · 10h 38m
Nov: 6:59 AM – 4:08 PM · 9h 09m
Dec: 7:32 AM – 3:56 PM · 8h 25m
Daylight Pacific Time (PT) Longest: 15h 37m · Shortest: 8h 23m

Nearby Stations

Winchester, ID May 23 - September 25 Moscow U Of I, ID Pullman Moscow Rgnl AP, WA April 29 - October 2 Pullman 2 Nw, WA May 6 - September 29 Pomeroy, WAMay 2 - October 4 Dworshak Fish Hatchery, ID April 20 - October 20

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