Frost Dates for Diablo 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. April 10
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 1
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 20
First Fall Frost October 28

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze March 13
First Fall Hard Freeze November 20
48.71°N, -121.14°W © OpenStreetMap

Growing Season

205 Days April 10 to November 1

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°
34°
High: 39°
Avg: 34°
Low: 30°
Jan
37°
High: 43°
Avg: 37°
Low: 30°
Feb
41°
High: 49°
Avg: 41°
Low: 33°
Mar
47°
High: 57°
Avg: 47°
Low: 38°
Apr
55°
High: 66°
Avg: 55°
Low: 44°
May
60°
High: 70°
Avg: 60°
Low: 49°
Jun
66°
High: 78°
Avg: 66°
Low: 53°
Jul
66°
High: 79°
Avg: 66°
Low: 54°
Aug
60°
High: 71°
Avg: 60°
Low: 49°
Sep
50°
High: 58°
Avg: 50°
Low: 42°
Oct
40°
High: 45°
Avg: 40°
Low: 35°
Nov
34°
High: 38°
Avg: 34°
Low: 30°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 4" 8" 12" 12.5"
12.4"
12.38"
Jan
8.5"
8.46"
Feb
7.1"
7.13"
Mar
5.1"
5.08"
Apr
3.9"
3.86"
May
3.2"
3.17"
Jun
3.1"
3.10"
Jul
3.5"
3.54"
Aug
4.7"
4.66"
Sep
8.8"
8.83"
Oct
12.0"
12.02"
Nov
12.5"
12.47"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8h10h12h13h15h16h16h14h12h11h9h8h
Jan: 7:45 AM – 4:15 PM · 8h 29m
Feb: 7:02 AM – 4:58 PM · 9h 55m
Mar: 6:13 AM – 5:47 PM · 11h 34m
Apr: 5:16 AM – 6:44 PM · 13h 27m
May: 4:29 AM – 7:31 PM · 15h 02m
Jun: 4:02 AM – 7:58 PM · 15h 55m
Jul: 4:13 AM – 7:47 PM · 15h 33m
Aug: 4:55 AM – 7:05 PM · 14h 10m
Sep: 5:50 AM – 6:10 PM · 12h 20m
Oct: 6:44 AM – 5:16 PM · 10h 31m
Nov: 7:33 AM – 4:27 PM · 8h 54m
Dec: 7:58 AM – 4:02 PM · 8h 05m
Daylight Longest: 15h 57m · Shortest: 8h 03m

Nearby Stations

Ross Dam, WAApril 8 - November 10 Newhalem, WAApril 2 - November 14 Darrington 21 Nne, WA April 16 - October 25 Upper Baker Dam, WA April 24 - October 29 Concrete Ppl Fish Stn, WA March 28 - November 14 Stehekin 4 Nw, WA April 27 - October 17

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