Frost Dates for Sumas, WA

Based on data from Clearbrook 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 18
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 18
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 27
First Fall Frost October 8

Hard Freeze (28°F)

Last Spring Hard Freeze March 18
First Fall Hard Freeze November 7
49.00°N, -122.26°W © OpenStreetMap

Growing Season

183 Days April 18 to October 18

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.

Csb Warm-Summer Mediterranean

Warm, dry summers and mild, wet winters. Similar to hot-summer Mediterranean but cooler. Great for a wide range of vegetables and fruit trees with moderate water needs.

Köppen climate map

Temperature

30° 50° 70°
38°
High: 44°F
Avg: 38°F
Low: 32°F
Jan
40°
High: 48°F
Avg: 40°F
Low: 33°F
Feb
44°
High: 53°F
Avg: 44°F
Low: 36°F
Mar
49°
High: 59°F
Avg: 49°F
Low: 39°F
Apr
55°
High: 66°F
Avg: 55°F
Low: 45°F
May
60°
High: 70°F
Avg: 60°F
Low: 49°F
Jun
64°
High: 76°F
Avg: 64°F
Low: 51°F
Jul
63°
High: 77°F
Avg: 63°F
Low: 50°F
Aug
59°
High: 71°F
Avg: 59°F
Low: 47°F
Sep
51°
High: 59°F
Avg: 51°F
Low: 42°F
Oct
43°
High: 49°F
Avg: 43°F
Low: 36°F
Nov
38°
High: 43°F
Avg: 38°F
Low: 32°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 2" 4" 6" 6.9"
6.6"
6.58"
Jan
4.7"
4.65"
Feb
5.2"
5.19"
Mar
4.7"
4.73"
Apr
4.8"
4.77"
May
3.3"
3.26"
Jun
3.1"
3.10"
Jul
3.9"
3.87"
Aug
5.4"
5.44"
Sep
6.9"
6.91"
Oct
6.8"
6.80"
Nov
6.3"
6.33"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h16h15.5h14h12.5h10.5h9h8h
Jan: 7:46 AM – 4:14 PM · 8h 27m
Feb: 7:03 AM – 4:57 PM · 9h 54m
Mar: 6:13 AM – 5:47 PM · 11h 34m
Apr: 5:16 AM – 6:44 PM · 13h 28m
May: 4:28 AM – 7:32 PM · 15h 04m
Jun: 4:01 AM – 7:59 PM · 15h 57m
Jul: 4:12 AM – 7:48 PM · 15h 36m
Aug: 4:55 AM – 7:05 PM · 14h 11m
Sep: 5:50 AM – 6:10 PM · 12h 20m
Oct: 6:45 AM – 5:15 PM · 10h 30m
Nov: 7:34 AM – 4:26 PM · 8h 52m
Dec: 7:59 AM – 4:01 PM · 8h 02m
Daylight Longest: 15h 59m · Shortest: 8h 01m

Nearby Stations

Abbotsford A, BC April 2 - November 5 Mission West Abbey, BC March 21 - November 18 Bellingham Intl AP, WA March 31 - October 30 Maple Ridge Kanaka Creek, BC April 22 - October 25 Bellingham 3 Ssw, WA April 1 - November 2 White Rock Campbell Scientific, BC March 16 - November 14

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