South Dakota ice storm risk
Minnehaha County has the highest ice storm risk in South Dakota, scoring 99.1 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Minnehaha County | 99.1 | Very High |
| 2 | Codington County | 94.8 | Relatively High |
| 3 | Moody County | 93 | Relatively High |
| 4 | Lincoln County | 90.3 | Relatively High |
| 5 | Pennington County | 82.6 | Relatively High |
| 6 | Yankton County | 82.2 | Relatively High |
| 7 | Aurora County | 81.9 | Relatively Moderate |
| 8 | Brown County | 81.7 | Relatively Moderate |
| 9 | Davison County | 80.4 | Relatively Moderate |
| 10 | Brookings County | 80 | Relatively Moderate |
| 11 | Beadle County | 79.2 | Relatively Moderate |
| 12 | Lake County | 77.9 | Relatively Moderate |
| 13 | Roberts County | 77.8 | Relatively Moderate |
| 14 | Day County | 76.1 | Relatively Moderate |
| 15 | Charles Mix County | 76 | Relatively Moderate |
| 16 | Jackson County | 74.8 | Relatively Moderate |
| 17 | Hutchinson County | 72.1 | Relatively Moderate |
| 18 | McCook County | 69 | Relatively Moderate |
| 19 | Hanson County | 68 | Relatively Moderate |
| 20 | Union County | 67.7 | Relatively Moderate |
| 21 | Turner County | 67.1 | Relatively Moderate |
| 22 | Dewey County | 65.2 | Relatively Moderate |
| 23 | Deuel County | 64.4 | Relatively Moderate |
| 24 | Kingsbury County | 63.7 | Relatively Moderate |
| 25 | Brule County | 63.5 | Relatively Moderate |
| 26 | Jerauld County | 63.2 | Relatively Moderate |
| 27 | Grant County | 62.6 | Relatively Moderate |
| 28 | Bon Homme County | 62.4 | Relatively Moderate |
| 29 | Douglas County | 62.1 | Relatively Moderate |
| 30 | Clay County | 61.9 | Relatively Moderate |
| 31 | Hamlin County | 60.5 | Relatively Moderate |
| 32 | Spink County | 59.3 | Relatively Low |
| 33 | Gregory County | 57.9 | Relatively Low |
| 34 | Todd County | 57.7 | Relatively Low |
| 35 | Hughes County | 56.5 | Relatively Low |
| 36 | Meade County | 56.4 | Relatively Low |
| 37 | Tripp County | 55.1 | Relatively Low |
| 38 | Marshall County | 54.7 | Relatively Low |
| 39 | Sanborn County | 53 | Relatively Low |
| 40 | Clark County | 51.3 | Relatively Low |
| 41 | Edmunds County | 51 | Relatively Low |
| 42 | Miner County | 50.9 | Relatively Low |
| 43 | Faulk County | 46.3 | Relatively Low |
| 44 | McPherson County | 45.3 | Relatively Low |
| 45 | Ziebach County | 43.7 | Relatively Low |
| 46 | Perkins County | 40.2 | Relatively Low |
| 47 | Lyman County | 37.8 | Relatively Low |
| 48 | Corson County | 37.4 | Relatively Low |
| 49 | Hand County | 36.2 | Relatively Low |
| 50 | Haakon County | 33.6 | Relatively Low |
| 51 | Mellette County | 33.1 | Relatively Low |
| 52 | Hyde County | 32.3 | Relatively Low |
| 53 | Stanley County | 31.8 | Relatively Low |
| 54 | Buffalo County | 31.7 | Relatively Low |
| 55 | Jones County | 31.5 | Relatively Low |
| 56 | Potter County | 31.3 | Relatively Low |
| 57 | Harding County | 28.7 | Relatively Low |
| 58 | Walworth County | 27 | Very Low |
| 59 | Bennett County | 26.5 | Very Low |
| 60 | Sully County | 24.2 | Very Low |
| 61 | Campbell County | 21.6 | Very Low |
| 62 | Butte County | 21.3 | Very Low |
| 63 | Fall River County | 12.7 | Very Low |
| 64 | Oglala Lakota County | 11.9 | Very Low |
| 65 | Lawrence County | 8.3 | Very Low |
| 66 | Custer County | 3 | Very Low |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Ice Storm risk nationally:
Other hazard risks in South Dakota:
Frequently asked questions
What is the highest ice storm risk county in South Dakota?
Minnehaha County, SD has the highest ice storm risk in South Dakota, with a FEMA National Risk Index score of 99.1 out of 100 (rated "Very High").
How many counties in South Dakota are rated Very High for ice storm risk?
1 of 66 scored South Dakota counties are rated "Very High" for ice storm risk by FEMA's National Risk Index.
What causes ice storm risk in South Dakota?
Ice storm risk covers damaging freezing rain and sleet accumulation, which collapses power lines, trees, and structures. The highest-risk counties cluster in a band from eastern Texas and Arkansas through the Carolinas and New England, where warm Gulf moisture overruns cold arctic air most frequently. Ice storms cause catastrophic and long-lasting power outages. Ice storm and sleet events are reported at forecast-zone level in NOAA Storm Events and are not included in county-level counts.