Frost Dates for Riverbend, WA

Based on data from Cedar Lake weather station, 4 miles away

Elevation: 509 ft

Frost Dates

Last Spring Frost (50%) April 23

First Fall Frost (50%) November 1

30% Probability

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

Zone 8a

Avg. annual minimum: 10 to 15°F

Learn more

Köppen Climate

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°

Jan

37°

Feb

40°

Mar

44°

Apr

50°

May

55°

Jun

61°

Jul

61°

Aug

56°

Sep

48°

Oct

40°

Nov

35°

Dec

32°F

Avg High Avg Temp Avg Low Light Frost (32°F)

Temperature table

Average monthly temperatures (°F)
Month	Avg High	Avg Temp	Avg Low
January	40°	36°	32°
February	42°	37°	32°
March	46°	40°	33°
April	51°	44°	36°
May	59°	50°	42°
June	63°	55°	46°
July	70°	61°	51°
August	71°	61°	52°
September	64°	56°	47°
October	54°	48°	41°
November	44°	40°	36°
December	39°	35°	31°

Precipitation

0" 4" 8" 12" 14.0"

13.2"

Jan

11.4"

Feb

11.6"

Mar

9.9"

Apr

7.9"

May

6.6"

Jun

4.0"

Jul

4.2"

Aug

7.1"

Sep

11.0"

Oct

14.0"

Nov

13.1"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	13.2
February	11.4
March	11.6
April	9.9
May	7.9
June	6.6
July	4.0
August	4.2
September	7.1
October	11.0
November	14.0
December	13.1

Sunrise / Sunset

Jan: 7:57 AM – 4:36 PM · 8h 40m

Feb: 7:21 AM – 5:22 PM · 10h 01m

Mar: 7:29 AM – 7:04 PM · 11h 35m

Apr: 6:26 AM – 7:49 PM · 13h 23m

May: 5:36 AM – 8:30 PM · 14h 54m

Jun: 5:15 AM – 8:59 PM · 15h 44m

Jul: 5:31 AM – 8:54 PM · 15h 23m

Aug: 6:09 AM – 8:13 PM · 14h 04m

Sep: 6:52 AM – 7:11 PM · 12h 19m

Oct: 7:35 AM – 6:10 PM · 10h 35m

Nov: 7:21 AM – 4:23 PM · 9h 02m

Dec: 7:55 AM – 4:11 PM · 8h 16m

Daylight Pacific Time (PT) Longest: 15h 45m · Shortest: 8h 15m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month	Sunrise	Sunset	Daylight
January	7:57 AM	4:36 PM	8h 40m
February	7:21 AM	5:22 PM	10h 01m
March	7:29 AM	7:04 PM	11h 35m
April	6:26 AM	7:49 PM	13h 23m
May	5:36 AM	8:30 PM	14h 54m
June	5:15 AM	8:59 PM	15h 44m
July	5:31 AM	8:54 PM	15h 23m
August	6:09 AM	8:13 PM	14h 04m
September	6:52 AM	7:11 PM	12h 19m
October	7:35 AM	6:10 PM	10h 35m
November	7:21 AM	4:23 PM	9h 02m
December	7:55 AM	4:11 PM	8h 16m

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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