Frost Dates for Mt Rushmore Nmem, SD

Elevation: 1619 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 15
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 21
First Fall Frost September 26

Hard Freeze (28°F)

Last Spring Hard Freeze May 4
First Fall Hard Freeze October 10
43.88°N, 103.46°W © OpenStreetMap

Growing Season

139 Days May 15 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 5b

Avg. annual minimum: −15 to −10°F

Learn more

Köppen Climate

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

Warm, wet summers and cold, dry winters. Growing season is concentrated in summer months. Hardy crops and those suited to short seasons perform best.

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
January37°28°19°
February36°27°18°
March44°35°25°
April50°41°32°
May60°51°42°
June71°62°52°
July79°69°59°
August78°68°58°
September69°59°50°
October55°46°37°
November44°36°27°
December37°28°20°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.2
February2.3
March3.8
April4.5
May4.9
June4.4
July4.1
August3.6
September3.4
October3.5
November2.5
December2.2

Sunrise / Sunset

Daylight Longest: 15h 17m · Shortest: 8h 43m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January7:28 AM4:32 PM9h 04m
February6:53 AM5:07 PM10h 15m
March6:11 AM5:49 PM11h 38m
April5:23 AM6:37 PM13h 13m
May4:44 AM7:16 PM14h 33m
June4:22 AM7:38 PM15h 16m
July4:31 AM7:29 PM14h 58m
August5:05 AM6:55 PM13h 49m
September5:51 AM6:09 PM12h 17m
October6:37 AM5:23 PM10h 45m
November7:18 AM4:42 PM9h 24m
December7:38 AM4:22 PM8h 44m

Nearby Stations

Hill City, SD June 1 - September 10 Custer, SDMay 18 - September 28 Custer Co AP, SD May 23 - September 24 Pactola Dam, SD May 28 - September 18 Johnson Siding, SD May 20 - September 25 Rapid City Wfo, SD May 3 - October 8

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview