Frost Dates for Grand Forks, BC

Based on data from Billings weather station, 9 miles away

Elevation: 514 m

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. May 3
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 8

30% Probability

Only 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 8
First Fall Frost October 2

Hard Freeze (−2°C)

Last Spring Hard Freeze April 9
First Fall Hard Freeze October 23
49.03°N, 118.44°W © OpenStreetMap

Growing Season

158 Days May 3 to October 8

USDA Hardiness Zone

Hardiness 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 6b

Avg. annual minimum: −21 to −18°C

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dsb Warm-Summer Continental (Dry Summer)

Warm, dry summers and cold, snowy winters. Common in mountain regions. Moderate growing season with irrigation needs in summer.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)
Temperature table
Average monthly temperatures (°C)
Month Avg High Avg Temp Avg Low
January0°-3°-5°
February3°0°-5°
March10°4°-1°
April15°9°2°
May21°14°6°
June24°17°10°
July30°21°13°
August29°21°12°
September23°16°8°
October14°8°2°
November4°1°-1°
December-1°-3°-5°

Precipitation

Precipitation table
Average monthly precipitation (millimeters)
MonthPrecipitation
January53
February41
March41
April51
May64
June66
July20
August8
September18
October41
November71
December58

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 15h 60m · Shortest: 8h 00m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:49 AM4:16 PM8h 27m
February7:11 AM5:04 PM9h 54m
March7:16 AM6:50 PM11h 34m
April6:09 AM7:37 PM13h 28m
May5:17 AM8:21 PM15h 04m
June4:54 AM8:52 PM15h 58m
July5:11 AM8:46 PM15h 36m
August5:52 AM8:03 PM14h 11m
September6:37 AM6:58 PM12h 20m
October7:23 AM5:53 PM10h 30m
November7:12 AM4:04 PM8h 52m
December7:48 AM3:50 PM8h 02m

Nearby Stations

Northport, WAMay 8 - October 1 Warfield Rcs, BC April 30 - October 12 Midway, BCMay 17 - September 21 Castlegar Bchpa Dam, BC April 14 - October 22 Castlegar A, BCMay 1 - October 7 Colville, WAMay 2 - October 2

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