Frost Dates for Ephrata, WA

Based on data from Ephrata Muni AP weather station, 2 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 22
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 17
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 29
First Fall Frost October 12

Hard Freeze (28°F)

Last Spring Hard Freeze April 6
First Fall Hard Freeze October 27
47.32°N, -119.55°W © OpenStreetMap

Growing Season

178 Days April 22 to October 17

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 7a

Avg. annual minimum: 0 to 5°F (−18 to −15°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°
30°
High: 36°F
Avg: 30°F
Low: 24°F
Jan
35°
High: 43°F
Avg: 35°F
Low: 27°F
Feb
43°
High: 54°F
Avg: 43°F
Low: 32°F
Mar
51°
High: 63°F
Avg: 51°F
Low: 39°F
Apr
61°
High: 73°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: 61°F
Jul
74°
High: 88°F
Avg: 74°F
Low: 59°F
Aug
65°
High: 79°F
Avg: 65°F
Low: 51°F
Sep
51°
High: 62°F
Avg: 51°F
Low: 39°F
Oct
38°
High: 46°F
Avg: 38°F
Low: 30°F
Nov
30°
High: 36°F
Avg: 30°F
Low: 24°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 1.9"
1.9"
1.86"
Jan
1.7"
1.68"
Feb
1.9"
1.86"
Mar
1.6"
1.59"
Apr
1.9"
1.89"
May
1.9"
1.95"
Jun
0.3"
0.26"
Jul
0.0"
0.00"
Aug
0.3"
0.28"
Sep
1.6"
1.55"
Oct
1.7"
1.74"
Nov
1.9"
1.86"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h15.5h15.5h14h12.5h10.5h9h8.5h
Jan: 7:40 AM – 4:20 PM · 8h 40m
Feb: 6:59 AM – 5:01 PM · 10h 01m
Mar: 6:12 AM – 5:48 PM · 11h 36m
Apr: 5:19 AM – 6:41 PM · 13h 23m
May: 4:33 AM – 7:27 PM · 14h 53m
Jun: 4:09 AM – 7:51 PM · 15h 43m
Jul: 4:19 AM – 7:41 PM · 15h 22m
Aug: 4:58 AM – 7:02 PM · 14h 03m
Sep: 5:50 AM – 6:10 PM · 12h 19m
Oct: 6:42 AM – 5:18 PM · 10h 35m
Nov: 7:28 AM – 4:32 PM · 9h 03m
Dec: 7:52 AM – 4:08 PM · 8h 17m
Daylight Longest: 15h 44m · Shortest: 8h 16m

Nearby Stations

Moses Lake Grant Co AP, WA April 27 - October 8 Quincy, WAApril 21 - October 16 Hartline, WAMay 2 - October 12 Wenatchee Pangborn AP, WA April 8 - October 24 Smyrna, WAApril 23 - October 12 Waterville, WAMay 14 - October 1

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