Frost Dates for Britt, IA

Based on data from Britt 3e weather station, 3 miles away

Elevation: 1227 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. April 29
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 7

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 3
First Fall Frost October 2

Hard Freeze (28°F)

Last Spring Hard Freeze April 18
First Fall Hard Freeze October 17
43.10°N, 93.80°W © OpenStreetMap

Growing Season

161 Days April 29 to October 7

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 5a

Avg. annual minimum: −20 to −15°F

Learn more

Köppen Climate

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

Hot summers and cold winters with year-round precipitation. Moderate growing season supports warm-season crops like tomatoes, peppers, and corn. Winter protection extends the harvest.

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
January24°15°6°
February28°19°10°
March41°32°23°
April57°45°34°
May69°58°48°
June79°69°58°
July82°72°62°
August80°69°59°
September73°62°50°
October60°49°37°
November43°34°25°
December30°21°13°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.1
February2.6
March4.3
April6.1
May5.4
June6.4
July7.1
August6.2
September5.1
October3.6
November3.0
December2.8

Sunrise / Sunset

Daylight Central Time (CT) Longest: 15h 12m · Shortest: 8h 48m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Central Time (CT))
Month Sunrise Sunset Daylight
January7:50 AM4:59 PM9h 09m
February7:21 AM5:38 PM10h 18m
March7:35 AM7:14 PM11h 39m
April6:40 AM7:51 PM13h 11m
May5:57 AM8:26 PM14h 29m
June5:40 AM8:50 PM15h 10m
July5:54 AM8:47 PM14h 53m
August6:26 AM8:12 PM13h 46m
September7:01 AM7:18 PM12h 17m
October7:37 AM6:24 PM10h 47m
November7:16 AM4:44 PM9h 28m
December7:46 AM4:36 PM8h 49m

Nearby Stations

Forest City 2 Nne, IA April 30 - October 7 Mason City Muni AP, IA May 3 - October 1 Algona, IAApril 30 - October 6 Clarion, IAApril 30 - October 10 Mason City, IA April 29 - October 7 Dakota City, IA April 26 - October 12

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