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South Dakota frost dates

Across 166 NOAA climate stations in South Dakota, the median last spring frost (32°F) ranges from Apr 26 at Sioux Falls Wfo AP to Jun 1 at Hill City; the typical station sees its last frost around May 8 and its first fall frost around Oct 1.

“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.

StationElevationLast frost (median)Last frost (10% risk)First frost (median)First frost (10% risk)Growing season
Aberdeen1,302 ftMay 9May 22Sep 26Sep 14139 days
Aberdeen 3 E1,301 ftMay 8May 21Sep 29Sep 17144 days
Aberdeen 35 Wnw1,957 ftMay 10May 22Sep 30Sep 19143 days
Academy 2NE1,681 ftApr 30May 14Oct 8Sep 24159 days
Alexandria1,365 ftMay 8May 21Sep 29Sep 17143 days
Andover #21,478 ftMay 6May 21Oct 4Sep 21150 days
Antelope Rs2,820 ftMay 19Jun 2Sep 19Sep 3121 days
Ardmore 1 Nw3,540 ftMay 16May 31Sep 23Sep 9128 days
Arlington 1 W1,824 ftMay 3May 15Oct 2Sep 19151 days
Armour1,510 ftMay 3May 18Oct 6Sep 23157 days
Astoria 4S1,890 ftMay 6May 20Oct 3Sep 20150 days
Bear Ridge3,900 ftMay 17May 30Sep 27Sep 11132 days
Belle Fourche3,020 ftMay 10May 25Sep 30Sep 16143 days
Belle Fourche 22 Nnw3,200 ftMay 15May 28Sep 24Sep 9130 days
Bison2,780 ftMay 10May 24Oct 1Sep 16144 days
Bonesteel1,985 ftMay 3May 15Oct 10Sep 26159 days
Bridgewater1,417 ftApr 30May 11Oct 7Sep 25161 days
Britton1,355 ftMay 13May 27Sep 26Sep 14135 days
Brookings 2 Ne1,639 ftMay 6May 19Oct 1Sep 17145 days
Buffalo 13 Ese2,883 ftMay 20Jun 2Sep 19Sep 3120 days
Buffalo Asos3,004 ftMay 10May 23Oct 1Sep 16141 days
Camp Crook3,120 ftMay 17May 30Sep 24Sep 9128 days
Canton1,316 ftMay 2May 15Oct 2Sep 19151 days
Castlewood1,685 ftMay 10May 23Sep 27Sep 14139 days
Castlewood #21,689 ftMay 6May 20Oct 1Sep 19145 days
Cedar Butte2,355 ftMay 6May 22Oct 4Sep 22151 days
Centerville 6 Se1,276 ftMay 2May 15Oct 1Sep 17151 days
Chamberlain 5 S1,704 ftMay 3May 17Oct 7Sep 25156 days
Chamberlain Muni AP1,703 ftMay 1May 14Oct 7Sep 23158 days
Clark1,804 ftMay 5May 18Oct 5Sep 24153 days
Clark No21,814 ftMay 5May 17Oct 5Sep 24152 days
Clear Lake1,812 ftMay 7May 21Oct 1Sep 19146 days
Columbia 8 N1,305 ftMay 7May 22Sep 29Sep 18145 days
Conde1,330 ftMay 6May 20Sep 29Sep 16144 days
Cottonwood 2 E2,373 ftMay 16May 29Sep 26Sep 13132 days
Custer5,480 ftMay 18Jun 1Sep 28Sep 10129 days
Custer Co AP5,545 ftMay 23Jun 6Sep 24Sep 9122 days
De Smet1,705 ftMay 5May 20Oct 4Sep 23151 days
Deadwood4,670 ftMay 24Jun 6Sep 25Sep 9125 days
Dupree2,388 ftMay 8May 22Oct 1Sep 17144 days
Dupree 15 Sse2,100 ftMay 6May 20Oct 2Sep 20148 days
Edgemont3,432 ftMay 23Jun 7Sep 20Sep 6117 days
Edgemont 23 Nnw4,402 ftMay 18Jun 1Sep 27Sep 14130 days
Elm Springs 3 Ese2,645 ftMay 8May 22Oct 3Sep 18146 days
Eureka1,871 ftMay 12May 25Sep 27Sep 14137 days
Faith2,592 ftMay 6May 20Oct 5Sep 20151 days
Faith Muni AP2,580 ftMay 7May 20Oct 3Sep 19147 days
Faulkton 1 Nw1,597 ftMay 10May 25Sep 28Sep 15139 days
Flandreau1,567 ftMay 5May 17Oct 1Sep 19148 days
Forestburg 4 Nne1,277 ftMay 9May 24Sep 28Sep 14140 days
Ft Meade3,308 ftMay 8May 21Oct 3Sep 19147 days
Ft Pierre 17 Wsw1,590 ftMay 10May 25Sep 27Sep 13138 days
Gann Valley 3 Nne1,646 ftMay 7May 21Oct 1Sep 19146 days
Gann Valley 4NW1,720 ftMay 6May 19Oct 1Sep 20148 days
Gettysburg2,084 ftMay 7May 21Oct 2Sep 21147 days
Glad Valley 2 W2,487 ftMay 11May 24Sep 30Sep 16140 days
Gregory2,160 ftMay 6May 20Oct 3Sep 21149 days
Harrington2,980 ftMay 11May 24Oct 1Sep 18143 days
Harrold 12 Ssw1,701 ftMay 17May 31Sep 24Sep 10129 days
Hereford 12 Sw2,810 ftMay 8May 22Oct 3Sep 20147 days
Highmore 1 W1,888 ftMay 12May 28Oct 1Sep 17142 days
Highmore 23 N1,870 ftMay 14May 25Sep 29Sep 16138 days
Hill City4,946 ftJun 1Jun 19Sep 10Aug 29102 days
Hoover2,773 ftMay 19May 31Sep 21Sep 6122 days
Hot Springs3,560 ftMay 16May 31Sep 27Sep 12133 days
Howard1,570 ftMay 5May 18Oct 2Sep 19149 days
Huron Rgnl AP1,280 ftMay 6May 20Oct 2Sep 19146 days
Interior 3 Ne2,440 ftMay 5May 20Oct 7Sep 23152 days
Ipswich1,547 ftMay 8May 22Sep 29Sep 17143 days
Johnson Siding4,184 ftMay 20Jun 3Sep 25Sep 11126 days
Kennebec1,681 ftMay 12May 26Sep 28Sep 15137 days
Kirley 6 N2,160 ftMay 6May 21Oct 4Sep 21148 days
Kyle 2 E2,958 ftMay 11May 27Oct 1Sep 15139 days
Ladner 9SW3,000 ftMay 13May 25Sep 27Sep 11135 days
Lake Sharpe Prj1,461 ftMay 6May 20Oct 5Sep 23152 days
Lead5,112 ftMay 18Jun 1Sep 29Sep 15133 days
Lemmon2,567 ftMay 10May 24Sep 30Sep 18142 days
Leola1,580 ftMay 9May 21Sep 28Sep 17141 days
Lodgepole 5SW2,570 ftMay 30Jun 13Sep 11Aug 28103 days
Longvalley2,470 ftMay 9May 24Oct 1Sep 17143 days
Ludlow 3 Sse2,990 ftMay 16May 29Sep 26Sep 9131 days
Madison 2SE1,643 ftMay 5May 18Sep 30Sep 18148 days
Manderson 3 Ne3,095 ftMay 9May 24Oct 4Sep 20147 days
Martin3,330 ftMay 13May 27Oct 2Sep 18141 days
Martin 8 E3,036 ftMay 14May 28Oct 1Sep 16139 days
Maurine 12SW2,629 ftMay 13May 27Sep 28Sep 13136 days
Mc Intosh 6 Se2,179 ftMay 9May 24Sep 30Sep 19143 days
Mc Laughlin2,001 ftMay 12May 25Sep 28Sep 16137 days
Mellette 4 W1,296 ftMay 11May 23Sep 27Sep 15137 days
Menno1,332 ftMay 1May 14Oct 4Sep 21156 days
Midland1,870 ftMay 12May 26Sep 28Sep 13138 days
Milbank1,142 ftMay 5May 18Oct 2Sep 20150 days
Milbank 4 Nw1,145 ftMay 2May 15Oct 4Sep 22153 days
Milesville 5 Ne2,237 ftMay 8May 22Oct 2Sep 17147 days
Miller1,576 ftMay 3May 16Oct 3Sep 20152 days
Mission2,587 ftMay 9May 21Oct 1Sep 19146 days
Mission 14 S2,810 ftMay 11May 25Oct 2Sep 21145 days
Mission Ridge 5NW1,982 ftMay 6May 22Oct 7Sep 22152 days
Mitchell1,287 ftApr 27May 10Oct 11Sep 30167 days
Mitchell 2 N1,250 ftMay 2May 15Oct 6Sep 23156 days
Mitchell Muni AP1,303 ftApr 30May 13Oct 5Sep 22159 days
Mobridge 2NNW1,693 ftMay 3May 16Oct 8Sep 25157 days
Mobridge Muni AP1,715 ftMay 5May 20Oct 4Sep 21150 days
Montrose 8N1,718 ftMay 3May 15Oct 4Sep 21153 days
Mt Rushmore Nmem5,311 ftMay 15May 29Oct 1Sep 16138 days
Murdo2,316 ftMay 3May 16Oct 9Sep 25158 days
Newell2,860 ftMay 8May 22Oct 1Sep 19144 days
Oahe Dam1,663 ftMay 6May 19Oct 5Sep 23152 days
Oelrichs3,348 ftMay 15May 28Sep 30Sep 16137 days
Oglala 1S2,995 ftMay 7May 21Oct 4Sep 21149 days
Onida 4 Nw1,851 ftMay 8May 22Oct 2Sep 19147 days
Oral2,960 ftMay 15May 28Sep 27Sep 11133 days
Pactola Dam4,720 ftMay 28Jun 11Sep 18Sep 4112 days
Philip AP2,206 ftMay 11May 24Sep 30Sep 17141 days
Pickstown1,490 ftApr 30May 12Oct 13Sep 29165 days
Pickstown 4SSW1,707 ftApr 27May 11Oct 13Sep 27168 days
Pierre 24 S2,124 ftMay 6May 20Oct 7Sep 22154 days
Pierre Rgnl AP1,742 ftMay 6May 21Oct 3Sep 20148 days
Pine Ridge AP3,278 ftMay 16May 31Sep 27Sep 13132 days
Plainview 6 Ssw2,377 ftMay 15May 29Sep 27Sep 14134 days
Pollock1,639 ftMay 8May 21Sep 30Sep 18143 days
Porcupine 11 N2,820 ftMay 17Jun 1Sep 25Sep 10130 days
Presho 7 Nw1,810 ftMay 12May 28Sep 29Sep 16140 days
Ralph 1 N2,790 ftMay 18May 31Sep 23Sep 8126 days
Rapid City 4NW3,479 ftMay 10May 25Oct 5Sep 20147 days
Rapid City Rgnl AP3,160 ftMay 12May 26Oct 1Sep 16139 days
Rapid City Wfo3,379 ftMay 3May 17Oct 8Sep 26157 days
Rauville 2 W1,737 ftMay 7May 20Sep 28Sep 16143 days
Red Owl2,773 ftMay 16May 27Sep 26Sep 11131 days
Redfield1,309 ftMay 8May 21Oct 1Sep 19145 days
Redig 11 Ne3,070 ftMay 15May 27Sep 24Sep 9131 days
Roscoe1,835 ftMay 7May 20Oct 3Sep 19148 days
Roy Lake1,810 ftMay 2May 15Oct 9Sep 27160 days
Salem 5NE1,594 ftMay 7May 19Sep 29Sep 17144 days
Selby1,908 ftMay 8May 21Oct 1Sep 19145 days
Shadehill Rsvr2,450 ftMay 16May 29Sep 24Sep 9131 days
Sioux Falls1,430 ftMay 1May 14Oct 6Sep 23157 days
Sioux Falls 14 Nne1,594 ftMay 1May 15Oct 4Sep 21155 days
Sioux Falls Wfo AP1,430 ftApr 26May 9Oct 13Sep 28169 days
Sisseton1,209 ftMay 4May 17Oct 3Sep 22151 days
Sisseton Muni AP1,161 ftMay 3May 16Sep 30Sep 17149 days
Spearfish3,633 ftMay 12May 25Oct 2Sep 21143 days
Stephan 2 Nw1,805 ftMay 10May 24Sep 29Sep 16140 days
Summit 1 W1,955 ftMay 14May 28Sep 28Sep 13136 days
Timber Lake2,173 ftMay 10May 23Sep 30Sep 17141 days
Turton1,335 ftMay 7May 22Oct 3Sep 21149 days
Tyndall1,420 ftMay 1May 14Oct 7Sep 24158 days
Vermillion 2 Se1,137 ftMay 3May 16Oct 3Sep 20153 days
Victor 4 N1,095 ftMay 4May 17Oct 3Sep 21152 days
Wagner1,430 ftApr 29May 12Oct 9Sep 25164 days
Wasta2,328 ftMay 10May 25Oct 1Sep 14141 days
Watertown 2 S1,772 ftMay 3May 14Oct 4Sep 22153 days
Watertown Rgnl AP1,748 ftMay 7May 20Sep 30Sep 19145 days
Waubay Natl Wild Life1,827 ftMay 1May 12Oct 12Sep 30164 days
Webster1,861 ftMay 4May 16Oct 6Sep 25156 days
Wentworth 2.5 Wnw1,722 ftMay 2May 14Oct 5Sep 24156 days
Wessington Springs1,715 ftMay 2May 14Oct 8Sep 26157 days
White Lake1,629 ftMay 3May 17Oct 5Sep 21153 days
Wilmot1,201 ftMay 5May 18Oct 1Sep 21149 days
Wind Cave4,155 ftMay 15May 30Sep 29Sep 13133 days
Winfred 2S1,705 ftMay 6May 17Oct 3Sep 22151 days
Winner2,016 ftMay 1May 16Oct 9Sep 25159 days
Winner Wiley Fld2,032 ftMay 1May 15Oct 10Sep 27162 days
Wood2,180 ftMay 10May 22Oct 1Sep 19143 days
Yankton 2 E1,180 ftApr 27May 10Oct 11Sep 27164 days
Zeona 10 Ssw2,730 ftMay 11May 27Sep 28Sep 12137 days
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