Tennessee ice storm risk
Knox County has the highest ice storm risk in Tennessee, scoring 92.3 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Knox County | 92.3 | Relatively High |
| 2 | Obion County | 92.3 | Relatively High |
| 3 | Montgomery County | 91.8 | Relatively High |
| 4 | Shelby County | 91.2 | Relatively High |
| 5 | Tipton County | 90.9 | Relatively High |
| 6 | Madison County | 88.1 | Relatively High |
| 7 | Dyer County | 87.8 | Relatively High |
| 8 | Sumner County | 87.6 | Relatively High |
| 9 | Hamilton County | 85.8 | Relatively High |
| 10 | Gibson County | 84.7 | Relatively High |
| 11 | Williamson County | 84.4 | Relatively High |
| 12 | Henry County | 83.1 | Relatively High |
| 13 | Lauderdale County | 82.7 | Relatively High |
| 14 | Maury County | 81.6 | Relatively Moderate |
| 15 | Weakley County | 81.4 | Relatively Moderate |
| 16 | Wilson County | 80.9 | Relatively Moderate |
| 17 | Davidson County | 80.4 | Relatively Moderate |
| 18 | Robertson County | 79.5 | Relatively Moderate |
| 19 | Fayette County | 78.6 | Relatively Moderate |
| 20 | Rutherford County | 75.4 | Relatively Moderate |
| 21 | Blount County | 74.3 | Relatively Moderate |
| 22 | Carroll County | 74.2 | Relatively Moderate |
| 23 | Dickson County | 74.1 | Relatively Moderate |
| 24 | Putnam County | 72.7 | Relatively Moderate |
| 25 | Crockett County | 69.3 | Relatively Moderate |
| 26 | Stewart County | 69.3 | Relatively Moderate |
| 27 | Anderson County | 67.9 | Relatively Moderate |
| 28 | Cheatham County | 66 | Relatively Moderate |
| 29 | Lake County | 64.8 | Relatively Moderate |
| 30 | Washington County | 64.7 | Relatively Moderate |
| 31 | Haywood County | 64.4 | Relatively Moderate |
| 32 | Cumberland County | 64.1 | Relatively Moderate |
| 33 | Bradley County | 62.8 | Relatively Moderate |
| 34 | Roane County | 61.4 | Relatively Moderate |
| 35 | Loudon County | 61.3 | Relatively Moderate |
| 36 | Sevier County | 61 | Relatively Moderate |
| 37 | Humphreys County | 60.1 | Relatively Moderate |
| 38 | Greene County | 59.8 | Relatively Low |
| 39 | Lincoln County | 59.8 | Relatively Low |
| 40 | Coffee County | 59.2 | Relatively Low |
| 41 | Carter County | 59.1 | Relatively Low |
| 42 | Macon County | 59.1 | Relatively Low |
| 43 | Bedford County | 58.2 | Relatively Low |
| 44 | Lawrence County | 58.2 | Relatively Low |
| 45 | Hamblen County | 57.4 | Relatively Low |
| 46 | Franklin County | 56.5 | Relatively Low |
| 47 | Benton County | 56.2 | Relatively Low |
| 48 | Cocke County | 54.7 | Relatively Low |
| 49 | Monroe County | 54.2 | Relatively Low |
| 50 | Campbell County | 54 | Relatively Low |
| 51 | Giles County | 52.9 | Relatively Low |
| 52 | Jefferson County | 50.6 | Relatively Low |
| 53 | Hickman County | 48.2 | Relatively Low |
| 54 | Marshall County | 48.1 | Relatively Low |
| 55 | McMinn County | 48 | Relatively Low |
| 56 | Warren County | 47.7 | Relatively Low |
| 57 | White County | 45.5 | Relatively Low |
| 58 | Marion County | 44.6 | Relatively Low |
| 59 | Scott County | 44.5 | Relatively Low |
| 60 | Hawkins County | 42.7 | Relatively Low |
| 61 | Overton County | 40.4 | Relatively Low |
| 62 | Houston County | 40.1 | Relatively Low |
| 63 | Jackson County | 39.3 | Relatively Low |
| 64 | Henderson County | 38.6 | Relatively Low |
| 65 | Claiborne County | 38.2 | Relatively Low |
| 66 | Hardin County | 37.4 | Relatively Low |
| 67 | Johnson County | 37.3 | Relatively Low |
| 68 | Rhea County | 37.1 | Relatively Low |
| 69 | Fentress County | 35.9 | Relatively Low |
| 70 | Grundy County | 35.2 | Relatively Low |
| 71 | Morgan County | 34.4 | Relatively Low |
| 72 | Hardeman County | 34.1 | Relatively Low |
| 73 | Grainger County | 34 | Relatively Low |
| 74 | Moore County | 33.5 | Relatively Low |
| 75 | Lewis County | 32.4 | Relatively Low |
| 76 | Clay County | 31.9 | Relatively Low |
| 77 | Polk County | 31.7 | Relatively Low |
| 78 | Wayne County | 31.2 | Relatively Low |
| 79 | DeKalb County | 30.6 | Relatively Low |
| 80 | Unicoi County | 28.6 | Relatively Low |
| 81 | Union County | 28.3 | Relatively Low |
| 82 | Sullivan County | 27.5 | Relatively Low |
| 83 | McNairy County | 27.3 | Relatively Low |
| 84 | Trousdale County | 26.3 | Very Low |
| 85 | Cannon County | 25.4 | Very Low |
| 86 | Chester County | 24.3 | Very Low |
| 87 | Decatur County | 24.3 | Very Low |
| 88 | Sequatchie County | 23.9 | Very Low |
| 89 | Perry County | 23.1 | Very Low |
| 90 | Bledsoe County | 21.8 | Very Low |
| 91 | Meigs County | 21.3 | Very Low |
| 92 | Pickett County | 19.6 | Very Low |
| 93 | Smith County | 18 | Very Low |
| 94 | Hancock County | 16.2 | Very Low |
| 95 | Van Buren County | 11.3 | 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 Tennessee:
Frequently asked questions
What is the highest ice storm risk county in Tennessee?
Knox County, TN has the highest ice storm risk in Tennessee, with a FEMA National Risk Index score of 92.3 out of 100 (rated "Relatively High").
What causes ice storm risk in Tennessee?
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.