Frost Dates for Sultan, WA

Based on data from Startup 1 E weather station, 5 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 15
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 25
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 26
First Fall Frost October 17

Hard Freeze (28°F)

Last Spring Hard Freeze March 18
First Fall Hard Freeze November 12
47.86°N, -121.82°W © OpenStreetMap

Growing Season

193 Days April 15 to October 25

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 8b

Avg. annual minimum: 15 to 20°F (−9 to −7°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°
41°
High: 47°F
Avg: 41°F
Low: 34°F
Jan
42°
High: 51°F
Avg: 42°F
Low: 34°F
Feb
45°
High: 55°F
Avg: 45°F
Low: 36°F
Mar
50°
High: 60°F
Avg: 50°F
Low: 39°F
Apr
56°
High: 67°F
Avg: 56°F
Low: 44°F
May
60°
High: 71°F
Avg: 60°F
Low: 49°F
Jun
65°
High: 78°F
Avg: 65°F
Low: 52°F
Jul
65°
High: 78°F
Avg: 65°F
Low: 51°F
Aug
60°
High: 73°F
Avg: 60°F
Low: 47°F
Sep
52°
High: 62°F
Avg: 52°F
Low: 42°F
Oct
45°
High: 52°F
Avg: 45°F
Low: 37°F
Nov
40°
High: 47°F
Avg: 40°F
Low: 34°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 3" 6" 9" 9.2"
8.2"
8.18"
Jan
6.6"
6.59"
Feb
7.0"
7.01"
Mar
6.5"
6.55"
Apr
6.3"
6.27"
May
5.4"
5.44"
Jun
3.9"
3.94"
Jul
4.1"
4.11"
Aug
5.7"
5.69"
Sep
7.8"
7.82"
Oct
9.1"
9.05"
Nov
9.2"
9.16"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h16h15.5h14h12.5h10.5h9h8h
Jan: 7:42 AM – 4:18 PM · 8h 36m
Feb: 7:01 AM – 4:59 PM · 9h 59m
Mar: 6:12 AM – 5:48 PM · 11h 35m
Apr: 5:18 AM – 6:42 PM · 13h 24m
May: 4:32 AM – 7:28 PM · 14h 57m
Jun: 4:06 AM – 7:54 PM · 15h 48m
Jul: 4:17 AM – 7:43 PM · 15h 27m
Aug: 4:57 AM – 7:03 PM · 14h 06m
Sep: 5:50 AM – 6:10 PM · 12h 20m
Oct: 6:43 AM – 5:17 PM · 10h 34m
Nov: 7:30 AM – 4:30 PM · 8h 59m
Dec: 7:54 AM – 4:06 PM · 8h 12m
Daylight Longest: 15h 49m · Shortest: 8h 11m

Nearby Stations

Tolt S Fk Rsvr, WA April 13 - November 10 Baring, WAApril 14 - October 29 Monroe, WAApril 17 - October 23 Snoqualmie Falls, WA March 30 - November 7 Everett, WAMarch 24 - November 2 Everett Snohomish AP, WA March 9 - November 17

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