Frost Dates for Box Elder, SD

Based on data from Rapid City Rgnl AP weather station, 5 miles away

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. May 12
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 1
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly 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 18
First Fall Frost September 25

Hard Freeze (28°F)

Last Spring Hard Freeze May 2
First Fall Hard Freeze October 9
44.11°N, -103.07°W © OpenStreetMap

Growing Season

142 Days May 12 to October 1

USDA Hardiness Zone iHardiness 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 (−29 to −26°C)

Learn more

Köppen Climate iThe 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

10° 30° 50° 70° 90°
24°
High: 36°F
Avg: 24°F
Low: 13°F
Jan
26°
High: 38°F
Avg: 26°F
Low: 14°F
Feb
35°
High: 48°F
Avg: 35°F
Low: 23°F
Mar
44°
High: 57°F
Avg: 44°F
Low: 31°F
Apr
54°
High: 67°F
Avg: 54°F
Low: 42°F
May
65°
High: 78°F
Avg: 65°F
Low: 52°F
Jun
73°
High: 86°F
Avg: 73°F
Low: 59°F
Jul
71°
High: 85°F
Avg: 71°F
Low: 56°F
Aug
61°
High: 76°F
Avg: 61°F
Low: 46°F
Sep
47°
High: 60°F
Avg: 47°F
Low: 34°F
Oct
35°
High: 47°F
Avg: 35°F
Low: 22°F
Nov
26°
High: 37°F
Avg: 26°F
Low: 14°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 3" 3.4"
1.0"
0.99"
Jan
1.0"
0.97"
Feb
1.8"
1.79"
Mar
2.6"
2.61"
Apr
3.4"
3.40"
May
3.2"
3.19"
Jun
2.8"
2.76"
Jul
2.5"
2.50"
Aug
2.3"
2.32"
Sep
2.0"
2.01"
Oct
1.3"
1.25"
Nov
1.2"
1.24"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13h14.5h15.5h15h14h12.5h10.5h9.5h8.5h
Jan: 7:28 AM – 4:32 PM · 9h 03m
Feb: 6:53 AM – 5:07 PM · 10h 14m
Mar: 6:11 AM – 5:49 PM · 11h 38m
Apr: 5:23 AM – 6:37 PM · 13h 14m
May: 4:43 AM – 7:17 PM · 14h 34m
Jun: 4:21 AM – 7:39 PM · 15h 17m
Jul: 4:30 AM – 7:30 PM · 14h 59m
Aug: 5:05 AM – 6:55 PM · 13h 50m
Sep: 5:51 AM – 6:09 PM · 12h 17m
Oct: 6:38 AM – 5:22 PM · 10h 45m
Nov: 7:18 AM – 4:42 PM · 9h 23m
Dec: 7:39 AM – 4:21 PM · 8h 43m
Daylight Longest: 15h 18m · Shortest: 8h 42m

Nearby Stations

Rapid City Wfo, SD May 3 - October 8 Rapid City 4nw, SD May 10 - October 5 Johnson Siding, SD May 20 - September 25 Hereford 12 Sw, SD May 8 - October 3 Pactola Dam, SD May 28 - September 18 Mt Rushmore Nmem, SD May 15 - October 1

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