Frost Dates for Riverbend, WA

Based on data from Cedar Lake weather station, 4 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 23
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 May 2
First Fall Frost October 27

Hard Freeze (28°F)

Last Spring Hard Freeze March 24
First Fall Hard Freeze November 22
47.47°N, -121.75°W © OpenStreetMap

Growing Season

192 Days April 23 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

Avg. annual minimum: 10 to 15°F (−12 to −9°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Cfb Oceanic (Marine West Coast)

Mild year-round with cool summers and wet winters. Excellent for cool-season crops like brassicas, peas, and root vegetables. Extended harvest seasons but summer heat-loving crops may struggle.

Köppen climate map

Temperature

30° 50° 70°
36°
High: 40°F
Avg: 36°F
Low: 32°F
Jan
37°
High: 42°F
Avg: 37°F
Low: 32°F
Feb
40°
High: 46°F
Avg: 40°F
Low: 33°F
Mar
44°
High: 51°F
Avg: 44°F
Low: 36°F
Apr
50°
High: 59°F
Avg: 50°F
Low: 42°F
May
55°
High: 63°F
Avg: 55°F
Low: 46°F
Jun
61°
High: 70°F
Avg: 61°F
Low: 51°F
Jul
61°
High: 71°F
Avg: 61°F
Low: 52°F
Aug
56°
High: 64°F
Avg: 56°F
Low: 47°F
Sep
48°
High: 54°F
Avg: 48°F
Low: 41°F
Oct
40°
High: 44°F
Avg: 40°F
Low: 36°F
Nov
35°
High: 39°F
Avg: 35°F
Low: 31°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 4" 8" 12" 14.0"
13.2"
13.22"
Jan
11.4"
11.36"
Feb
11.6"
11.61"
Mar
9.9"
9.87"
Apr
7.9"
7.94"
May
6.6"
6.62"
Jun
4.0"
3.99"
Jul
4.2"
4.17"
Aug
7.1"
7.08"
Sep
11.0"
10.96"
Oct
14.0"
13.97"
Nov
13.1"
13.11"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h15.5h15.5h14h12.5h10.5h9h8.5h
Jan: 7:40 AM – 4:20 PM · 8h 40m
Feb: 6:60 AM – 5:00 PM · 10h 01m
Mar: 6:12 AM – 5:48 PM · 11h 35m
Apr: 5:18 AM – 6:42 PM · 13h 23m
May: 4:33 AM – 7:27 PM · 14h 54m
Jun: 4:08 AM – 7:52 PM · 15h 44m
Jul: 4:18 AM – 7:42 PM · 15h 23m
Aug: 4:58 AM – 7:02 PM · 14h 04m
Sep: 5:50 AM – 6:10 PM · 12h 19m
Oct: 6:42 AM – 5:18 PM · 10h 35m
Nov: 7:29 AM – 4:31 PM · 9h 02m
Dec: 7:52 AM – 4:08 PM · 8h 16m
Daylight Longest: 15h 45m · Shortest: 8h 15m

Nearby Stations

Palmer 3 Ese, WA April 3 - November 11 Snoqualmie Falls, WA March 30 - November 7 Landsburg, WA April 20 - October 25 Tolt S Fk Rsvr, WA April 13 - November 10 Buckley 1 Ne, WA April 7 - October 30 Mud Mtn Dam, WA April 18 - October 31

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