Illinois ice storm risk
Cook County has the highest ice storm risk in Illinois, scoring 97.2 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Cook County | 97.2 | Very High |
| 2 | St. Clair County | 91 | Relatively High |
| 3 | Peoria County | 89.4 | Relatively High |
| 4 | Winnebago County | 85.2 | Relatively High |
| 5 | Williamson County | 81.9 | Relatively Moderate |
| 6 | Sangamon County | 80.6 | Relatively Moderate |
| 7 | Rock Island County | 80.4 | Relatively Moderate |
| 8 | Will County | 80.2 | Relatively Moderate |
| 9 | Massac County | 79.7 | Relatively Moderate |
| 10 | Jackson County | 79.2 | Relatively Moderate |
| 11 | Madison County | 75.1 | Relatively Moderate |
| 12 | Tazewell County | 74.9 | Relatively Moderate |
| 13 | DuPage County | 74 | Relatively Moderate |
| 14 | Fulton County | 73.7 | Relatively Moderate |
| 15 | McLean County | 71.6 | Relatively Moderate |
| 16 | Saline County | 71.5 | Relatively Moderate |
| 17 | Knox County | 71 | Relatively Moderate |
| 18 | Stephenson County | 69.7 | Relatively Moderate |
| 19 | Henry County | 69 | Relatively Moderate |
| 20 | Whiteside County | 68.9 | Relatively Moderate |
| 21 | Johnson County | 68.4 | Relatively Moderate |
| 22 | Alexander County | 67.8 | Relatively Moderate |
| 23 | Champaign County | 67.8 | Relatively Moderate |
| 24 | Mercer County | 66.3 | Relatively Moderate |
| 25 | Macon County | 66.1 | Relatively Moderate |
| 26 | McDonough County | 65.6 | Relatively Moderate |
| 27 | Kane County | 63.6 | Relatively Moderate |
| 28 | Union County | 63.5 | Relatively Moderate |
| 29 | Lake County | 63.2 | Relatively Moderate |
| 30 | Franklin County | 63.1 | Relatively Moderate |
| 31 | LaSalle County | 61.9 | Relatively Moderate |
| 32 | Vermilion County | 61.3 | Relatively Moderate |
| 33 | Bureau County | 61.1 | Relatively Moderate |
| 34 | DeKalb County | 60.1 | Relatively Moderate |
| 35 | Ogle County | 59.9 | Relatively Low |
| 36 | Morgan County | 59.3 | Relatively Low |
| 37 | Pulaski County | 57.8 | Relatively Low |
| 38 | Jo Daviess County | 56.6 | Relatively Low |
| 39 | McHenry County | 55.6 | Relatively Low |
| 40 | Warren County | 55 | Relatively Low |
| 41 | White County | 53.9 | Relatively Low |
| 42 | Adams County | 53.5 | Relatively Low |
| 43 | Pope County | 52.3 | Relatively Low |
| 44 | Randolph County | 49.7 | Relatively Low |
| 45 | Effingham County | 49.4 | Relatively Low |
| 46 | Gallatin County | 48.6 | Relatively Low |
| 47 | Kankakee County | 47.9 | Relatively Low |
| 48 | Logan County | 47.4 | Relatively Low |
| 49 | Richland County | 46.9 | Relatively Low |
| 50 | Hancock County | 46.8 | Relatively Low |
| 51 | Woodford County | 46.3 | Relatively Low |
| 52 | Macoupin County | 46 | Relatively Low |
| 53 | Mason County | 45.5 | Relatively Low |
| 54 | Carroll County | 45.1 | Relatively Low |
| 55 | Coles County | 44.4 | Relatively Low |
| 56 | Fayette County | 43.9 | Relatively Low |
| 57 | Jefferson County | 43.7 | Relatively Low |
| 58 | Clark County | 43.1 | Relatively Low |
| 59 | Lee County | 42.2 | Relatively Low |
| 60 | Kendall County | 41.4 | Relatively Low |
| 61 | Hardin County | 40.7 | Relatively Low |
| 62 | Henderson County | 40.2 | Relatively Low |
| 63 | Marion County | 39.8 | Relatively Low |
| 64 | Menard County | 38.9 | Relatively Low |
| 65 | Edgar County | 37.6 | Relatively Low |
| 66 | Montgomery County | 37.6 | Relatively Low |
| 67 | Clay County | 37.5 | Relatively Low |
| 68 | Hamilton County | 36.2 | Relatively Low |
| 69 | Livingston County | 35.9 | Relatively Low |
| 70 | Lawrence County | 35.6 | Relatively Low |
| 71 | Wayne County | 35.3 | Relatively Low |
| 72 | Marshall County | 34.9 | Relatively Low |
| 73 | Christian County | 33.9 | Relatively Low |
| 74 | Crawford County | 33.5 | Relatively Low |
| 75 | Perry County | 33.5 | Relatively Low |
| 76 | Cumberland County | 33 | Relatively Low |
| 77 | De Witt County | 32.4 | Relatively Low |
| 78 | Boone County | 32.2 | Relatively Low |
| 79 | Stark County | 31.2 | Relatively Low |
| 80 | Piatt County | 29.8 | Relatively Low |
| 81 | Wabash County | 29.7 | Relatively Low |
| 82 | Edwards County | 27.6 | Relatively Low |
| 83 | Jasper County | 27.4 | Relatively Low |
| 84 | Shelby County | 26.3 | Very Low |
| 85 | Iroquois County | 26.2 | Very Low |
| 86 | Moultrie County | 25.9 | Very Low |
| 87 | Douglas County | 25.3 | Very Low |
| 88 | Cass County | 25 | Very Low |
| 89 | Grundy County | 24.8 | Very Low |
| 90 | Ford County | 21.8 | Very Low |
| 91 | Washington County | 21 | Very Low |
| 92 | Jersey County | 20.7 | Very Low |
| 93 | Putnam County | 20.4 | Very Low |
| 94 | Schuyler County | 19.7 | Very Low |
| 95 | Pike County | 19.3 | Very Low |
| 96 | Clinton County | 18.8 | Very Low |
| 97 | Bond County | 18.4 | Very Low |
| 98 | Monroe County | 17.4 | Very Low |
| 99 | Brown County | 16 | Very Low |
| 100 | Greene County | 14.7 | Very Low |
| 101 | Scott County | 10.6 | Very Low |
| 102 | Calhoun County | 4.8 | 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 Illinois:
Frequently asked questions
What is the highest ice storm risk county in Illinois?
Cook County, IL has the highest ice storm risk in Illinois, with a FEMA National Risk Index score of 97.2 out of 100 (rated "Very High").
How many counties in Illinois are rated Very High for ice storm risk?
1 of 102 scored Illinois counties are rated "Very High" for ice storm risk by FEMA's National Risk Index.
What causes ice storm risk in Illinois?
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.