Frost Dates for Mcnary Dam, 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. 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. November 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 April 3
First Fall Frost October 29

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze March 6
First Fall Hard Freeze November 18
45.94°N, -119.30°W © OpenStreetMap

Growing Season

222 Days March 27 to November 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 8a

Learn more

Temperature

20° 40° 60° 80°
35°
High: 41°
Avg: 35°
Low: 30°
Jan
39°
High: 47°
Avg: 39°
Low: 31°
Feb
46°
High: 56°
Avg: 46°
Low: 36°
Mar
53°
High: 64°
Avg: 53°
Low: 42°
Apr
61°
High: 73°
Avg: 61°
Low: 49°
May
67°
High: 80°
Avg: 67°
Low: 55°
Jun
75°
High: 89°
Avg: 75°
Low: 62°
Jul
75°
High: 88°
Avg: 75°
Low: 61°
Aug
66°
High: 78°
Avg: 66°
Low: 54°
Sep
54°
High: 64°
Avg: 54°
Low: 44°
Oct
43°
High: 51°
Avg: 43°
Low: 36°
Nov
36°
High: 42°
Avg: 36°
Low: 30°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2.0"
1.3"
1.29"
Jan
1.4"
1.39"
Feb
1.6"
1.55"
Mar
1.5"
1.50"
Apr
2.0"
1.99"
May
1.6"
1.65"
Jun
0.0"
0.00"
Jul
0.0"
0.00"
Aug
0.6"
0.60"
Sep
1.7"
1.73"
Oct
1.6"
1.61"
Nov
1.6"
1.55"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h15h16h15h14h12h11h9h8h
Jan: 7:35 AM – 4:25 PM · 8h 50m
Feb: 6:57 AM – 5:03 PM · 10h 07m
Mar: 6:12 AM – 5:48 PM · 11h 37m
Apr: 5:21 AM – 6:39 PM · 13h 19m
May: 4:38 AM – 7:22 PM · 14h 45m
Jun: 4:14 AM – 7:46 PM · 15h 32m
Jul: 4:24 AM – 7:36 PM · 15h 12m
Aug: 5:01 AM – 6:59 PM · 13h 57m
Sep: 5:51 AM – 6:09 PM · 12h 18m
Oct: 6:40 AM – 5:20 PM · 10h 39m
Nov: 7:24 AM – 4:36 PM · 9h 12m
Dec: 7:46 AM – 4:14 PM · 8h 28m
Daylight Longest: 15h 33m · Shortest: 8h 27m

Nearby Stations

Mcnary Dam #2, OR March 30 - November 4 Hermiston 2 Nw, OR April 27 - October 7 Hermiston Muni AP, OR April 26 - October 10 Boardman, ORApril 14 - October 21 Kennewick, WA March 28 - October 30 Pasco Tri Cities AP, WA April 27 - October 11

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