Frost Dates for Grand Forks, ND

Based on data from Grand Forks Univ (NWS) weather station, 3 miles away

Elevation: 830 ft

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 10
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 1

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 16
First Fall Frost September 26

Hard Freeze (28°F)

Last Spring Hard Freeze April 30
First Fall Hard Freeze October 12
47.93°N, 97.03°W © OpenStreetMap

Growing Season

144 Days May 10 to October 1

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 4a

Avg. annual minimum: −30 to −25°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dfb Warm-Summer Continental

Warm summers and cold, snowy winters. A shorter growing season than hot-summer continental. Hardy vegetables, root crops, and cool-season greens do well. Season extension is valuable.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January15°7°-1°
February20°11°3°
March34°25°17°
April52°42°31°
May67°55°44°
June76°65°55°
July80°70°59°
August79°68°57°
September70°59°47°
October53°44°35°
November35°27°20°
December21°13°6°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.1
February1.3
March2.1
April2.3
May4.1
June4.7
July4.8
August4.3
September3.3
October2.7
November1.6
December1.2

Sunrise / Sunset

Daylight Central Time (CT) Longest: 15h 50m · Shortest: 8h 10m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Central Time (CT))
Month Sunrise Sunset Daylight
January8:20 AM4:56 PM8h 36m
February7:44 AM5:42 PM9h 59m
March7:51 AM7:26 PM11h 35m
April6:46 AM8:11 PM13h 25m
May5:56 AM8:53 PM14h 57m
June5:35 AM9:23 PM15h 48m
July5:50 AM9:18 PM15h 27m
August6:30 AM8:36 PM14h 06m
September7:13 AM7:33 PM12h 20m
October7:57 AM6:30 PM10h 34m
November7:44 AM4:43 PM8h 59m
December8:18 AM4:30 PM8h 12m

Nearby Stations

Grand Forks Intl AP, ND May 16 - September 27 Crookston Nw Exp Stn, MN May 11 - September 27 Warren Wsd, MNMay 5 - October 2 Larimore 4sw, ND May 11 - September 28 Argyle, MNMay 15 - September 26 Mayville, NDMay 13 - September 27

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