Frost Dates for Oahe Dam, SD

Elevation: 507 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 6
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 5

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 11
First Fall Frost October 1

Hard Freeze (28°F)

Last Spring Hard Freeze April 27
First Fall Hard Freeze October 15
44.44°N, 100.42°W © OpenStreetMap

Growing Season

152 Days May 6 to October 5

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 4b

Avg. annual minimum: −25 to −20°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

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
January31°19°8°
February34°23°11°
March46°33°21°
April58°45°32°
May70°57°44°
June80°68°55°
July89°75°61°
August87°73°59°
September78°64°49°
October62°49°36°
November47°35°24°
December34°23°12°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.6
February1.7
March2.5
April3.4
May4.0
June3.9
July3.5
August3.0
September2.9
October3.0
November1.9
December1.7

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 00m
February6:54 AM5:06 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 20m
July4:29 AM7:31 PM15h 02m
August5:04 AM6:56 PM13h 51m
September5:51 AM6:09 PM12h 17m
October6:38 AM5:22 PM10h 44m
November7:20 AM4:40 PM9h 21m
December7:40 AM4:20 PM8h 40m

Nearby Stations

Pierre Rgnl AP, SD May 6 - October 3 Ft Pierre 17 Wsw, SD May 10 - September 27 Onida 4 Nw, SDMay 8 - October 2 Mission Ridge 5nw, SD May 6 - October 7 Pierre 24 S, SDMay 6 - October 7 Harrold 12 Ssw, SD May 17 - September 24

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