Wisconsin ice storm risk
Dane County has the highest ice storm risk in Wisconsin, scoring 83.4 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Dane County | 83.4 | Relatively High |
| 2 | Waukesha County | 81.7 | Relatively Moderate |
| 3 | Milwaukee County | 77.1 | Relatively Moderate |
| 4 | Eau Claire County | 62.2 | Relatively Moderate |
| 5 | Outagamie County | 59.7 | Relatively Low |
| 6 | Marathon County | 59 | Relatively Low |
| 7 | Rock County | 57.9 | Relatively Low |
| 8 | Clark County | 54.3 | Relatively Low |
| 9 | Grant County | 53.4 | Relatively Low |
| 10 | Sauk County | 50.3 | Relatively Low |
| 11 | Chippewa County | 50 | Relatively Low |
| 12 | Winnebago County | 49.8 | Relatively Low |
| 13 | Vernon County | 48.4 | Relatively Low |
| 14 | Richland County | 48.3 | Relatively Low |
| 15 | Brown County | 47.8 | Relatively Low |
| 16 | Monroe County | 47.5 | Relatively Low |
| 17 | Jackson County | 47.4 | Relatively Low |
| 18 | Racine County | 47.2 | Relatively Low |
| 19 | Marinette County | 46.9 | Relatively Low |
| 20 | Trempealeau County | 46.1 | Relatively Low |
| 21 | Adams County | 45.6 | Relatively Low |
| 22 | Crawford County | 45.3 | Relatively Low |
| 23 | Taylor County | 45.3 | Relatively Low |
| 24 | Vilas County | 44.9 | Relatively Low |
| 25 | Barron County | 44.7 | Relatively Low |
| 26 | Wood County | 44.7 | Relatively Low |
| 27 | Walworth County | 44.6 | Relatively Low |
| 28 | Jefferson County | 43.9 | Relatively Low |
| 29 | Polk County | 43.6 | Relatively Low |
| 30 | La Crosse County | 42.5 | Relatively Low |
| 31 | Waupaca County | 42.4 | Relatively Low |
| 32 | Green County | 42.3 | Relatively Low |
| 33 | Dodge County | 42 | Relatively Low |
| 34 | Kenosha County | 41.3 | Relatively Low |
| 35 | Door County | 40.1 | Relatively Low |
| 36 | Buffalo County | 40 | Relatively Low |
| 37 | Lafayette County | 38.4 | Relatively Low |
| 38 | Sawyer County | 38.4 | Relatively Low |
| 39 | Burnett County | 38 | Relatively Low |
| 40 | Shawano County | 37 | Relatively Low |
| 41 | Columbia County | 35.9 | Relatively Low |
| 42 | Dunn County | 35 | Relatively Low |
| 43 | St. Croix County | 34.8 | Relatively Low |
| 44 | Portage County | 34.5 | Relatively Low |
| 45 | Washington County | 33.3 | Relatively Low |
| 46 | Langlade County | 33 | Relatively Low |
| 47 | Oconto County | 32.1 | Relatively Low |
| 48 | Lincoln County | 31 | Relatively Low |
| 49 | Fond du Lac County | 29.6 | Relatively Low |
| 50 | Iowa County | 29.2 | Relatively Low |
| 51 | Oneida County | 29.1 | Relatively Low |
| 52 | Manitowoc County | 28 | Relatively Low |
| 53 | Price County | 26.8 | Very Low |
| 54 | Douglas County | 26 | Very Low |
| 55 | Juneau County | 25.1 | Very Low |
| 56 | Sheboygan County | 23.9 | Very Low |
| 57 | Waushara County | 23.8 | Very Low |
| 58 | Washburn County | 23.1 | Very Low |
| 59 | Pierce County | 22.9 | Very Low |
| 60 | Green Lake County | 22 | Very Low |
| 61 | Rusk County | 21 | Very Low |
| 62 | Ozaukee County | 20.6 | Very Low |
| 63 | Calumet County | 16.8 | Very Low |
| 64 | Menominee County | 16.1 | Very Low |
| 65 | Pepin County | 15.8 | Very Low |
| 66 | Bayfield County | 15.3 | Very Low |
| 67 | Kewaunee County | 13.1 | Very Low |
| 68 | Ashland County | 12 | Very Low |
| 69 | Iron County | 11.2 | Very Low |
| 70 | Marquette County | 8.2 | Very Low |
| 71 | Forest County | 2.1 | Very Low |
| 72 | Florence County | 0.6 | 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 Wisconsin:
Frequently asked questions
What is the highest ice storm risk county in Wisconsin?
Dane County, WI has the highest ice storm risk in Wisconsin, with a FEMA National Risk Index score of 83.4 out of 100 (rated "Relatively High").
What causes ice storm risk in Wisconsin?
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.