Frost Dates for Harrold 12 Ssw, SD

Elevation: 519 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 17
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. September 24

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 23
First Fall Frost September 19

Hard Freeze (28°F)

Last Spring Hard Freeze May 8
First Fall Hard Freeze October 2
44.36°N, 99.80°W © OpenStreetMap

Growing Season

130 Days May 17 to September 24

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.
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
January27°15°3°
February32°20°8°
March44°32°19°
April58°43°29°
May69°55°41°
June79°66°53°
July87°73°58°
August86°71°56°
September78°62°46°
October61°46°31°
November44°31°18°
December31°19°7°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January0.2
February1.8
March3.9
April6.9
May8.2
June8.4
July8.1
August7.8
September8.0
October7.6
November3.5
December2.5

Sunrise / Sunset

Daylight Longest: 15h 21m · Shortest: 8h 39m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January7:30 AM4:30 PM9h 01m
February6:53 AM5:07 PM10h 13m
March6:11 AM5:49 PM11h 38m
April5:23 AM6:37 PM13h 15m
May4:42 AM7:18 PM14h 36m
June4:20 AM7:40 PM15h 19m
July4:29 AM7:31 PM15h 01m
August5:04 AM6:56 PM13h 51m
September5:51 AM6:09 PM12h 17m
October6:38 AM5:22 PM10h 44m
November7:19 AM4:41 PM9h 21m
December7:40 AM4:20 PM8h 40m

Nearby Stations

Stephan 2 Nw, SD May 10 - September 29 Highmore 1 W, SD May 12 - October 1 Pierre Rgnl AP, SD May 6 - October 3 Lake Sharpe Prj, SD May 6 - October 5 Onida 4 Nw, SDMay 8 - October 2 Oahe Dam, SDMay 6 - October 5

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