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Iowa winter weather risk

99 counties scored 0 rated Very High

Linn County has the highest winter weather risk in Iowa, scoring 94.5 out of 100 — rated "Relatively High" by FEMA's National Risk Index.

# County NRI score Rating NOAA events
2016–2026
1 Linn County 94.5 Relatively High 0
2 Black Hawk County 93 Relatively High 0
3 Polk County 90.3 Relatively High 0
4 Story County 90.2 Relatively High 0
5 Scott County 88.2 Relatively High 0
6 Cerro Gordo County 88.1 Relatively High 0
7 Johnson County 87.9 Relatively High 0
8 Sioux County 87 Relatively High 0
9 Woodbury County 85.7 Relatively High 0
10 Marshall County 84.7 Relatively Moderate 0
11 Dickinson County 83.7 Relatively Moderate 0
12 Pottawattamie County 81.6 Relatively Moderate 0
13 Webster County 79.9 Relatively Moderate 0
14 Buena Vista County 76.9 Relatively Moderate 0
15 Plymouth County 75.8 Relatively Moderate 0
16 Dubuque County 72.1 Relatively Moderate 0
17 Hardin County 71.7 Relatively Moderate 0
18 Dallas County 71.6 Relatively Moderate 0
19 Kossuth County 71.1 Relatively Moderate 0
20 Lyon County 71.1 Relatively Moderate 0
21 Clay County 71 Relatively Moderate 0
22 Wright County 69.7 Relatively Moderate 0
23 Muscatine County 67.4 Relatively Moderate 0
24 Osceola County 66.7 Relatively Moderate 0
25 Hancock County 66.5 Relatively Moderate 0
26 Jasper County 66.4 Relatively Moderate 0
27 O'Brien County 66.3 Relatively Moderate 0
28 Hamilton County 66.1 Relatively Moderate 0
29 Floyd County 65.8 Relatively Moderate 0
30 Winnebago County 63.7 Relatively Moderate 0
31 Emmet County 62.8 Relatively Moderate 0
32 Fayette County 61.8 Relatively Moderate 0
33 Calhoun County 61.7 Relatively Moderate 0
34 Cherokee County 60.8 Relatively Moderate 0
35 Boone County 60.5 Relatively Low 0
36 Tama County 60.3 Relatively Low 0
37 Des Moines County 59.7 Relatively Low 0
38 Clinton County 59.5 Relatively Low 0
39 Butler County 58.3 Relatively Low 0
40 Grundy County 57.4 Relatively Low 0
41 Humboldt County 56 Relatively Low 0
42 Pocahontas County 55.4 Relatively Low 0
43 Benton County 55.1 Relatively Low 0
44 Carroll County 53.4 Relatively Low 0
45 Washington County 53.1 Relatively Low 0
46 Bremer County 52.6 Relatively Low 0
47 Iowa County 52.3 Relatively Low 0
48 Lee County 52 Relatively Low 0
49 Madison County 51.1 Relatively Low 0
50 Wapello County 51.1 Relatively Low 0
51 Franklin County 50.5 Relatively Low 0
52 Palo Alto County 50.2 Relatively Low 0
53 Buchanan County 48.6 Relatively Low 0
54 Cass County 48.2 Relatively Low 0
55 Crawford County 48.1 Relatively Low 0
56 Chickasaw County 47 Relatively Low 0
57 Poweshiek County 46.8 Relatively Low 0
58 Mahaska County 46.6 Relatively Low 0
59 Mitchell County 46.6 Relatively Low 0
60 Winneshiek County 45.9 Relatively Low 0
61 Greene County 45.5 Relatively Low 0
62 Union County 43.8 Relatively Low 0
63 Henry County 42.6 Relatively Low 0
64 Delaware County 42.5 Relatively Low 0
65 Page County 41.5 Relatively Low 0
66 Jefferson County 41.4 Relatively Low 0
67 Worth County 38.8 Relatively Low 0
68 Adair County 38.3 Relatively Low 0
69 Sac County 37.4 Relatively Low 0
70 Harrison County 36 Relatively Low 0
71 Jones County 35.6 Relatively Low 0
72 Guthrie County 34.6 Relatively Low 0
73 Audubon County 34.2 Relatively Low 0
74 Cedar County 33.9 Relatively Low 0
75 Mills County 33.6 Relatively Low 0
76 Ida County 33.1 Relatively Low 0
77 Montgomery County 31.1 Relatively Low 0
78 Marion County 30.8 Relatively Low 0
79 Shelby County 30.8 Relatively Low 0
80 Jackson County 30.6 Relatively Low 0
81 Keokuk County 30.5 Relatively Low 0
82 Clayton County 30.2 Relatively Low 0
83 Taylor County 29.9 Relatively Low 0
84 Davis County 29.8 Relatively Low 0
85 Howard County 29.2 Relatively Low 0
86 Fremont County 28.3 Relatively Low 0
87 Warren County 25.7 Relatively Low 0
88 Appanoose County 23.1 Very Low 0
89 Louisa County 22.3 Very Low 0
90 Clarke County 22.2 Very Low 0
91 Lucas County 21.6 Very Low 0
92 Van Buren County 21.4 Very Low 0
93 Allamakee County 20.2 Very Low 0
94 Adams County 19.1 Very Low 0
95 Decatur County 16.5 Very Low 0
96 Ringgold County 13.4 Very Low 0
97 Wayne County 12.1 Very Low 0
98 Monona County 10.8 Very Low 0
99 Monroe County 9.9 Very Low 0

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.

Winter Weather risk nationally:

Top 50 US counties

Other hazard risks in Iowa:

WildfireInland FloodingCoastal FloodingEarthquakeHeat WaveTornadoHurricaneHailStrong WindIce StormCold WaveLightningDroughtLandslideAvalancheTsunamiVolcanic Activity

Frequently asked questions

What is the highest winter weather risk county in Iowa?

Linn County, IA has the highest winter weather risk in Iowa, with a FEMA National Risk Index score of 94.5 out of 100 (rated "Relatively High").

What causes winter weather risk in Iowa?

Winter weather risk captures expected losses from heavy snow, blizzards, and mixed precipitation. Highest scores appear in the Great Lakes snowbelt, northern Rockies, and interior Northeast, where lake-effect and orographic snowfall is frequent. Winter weather impacts transportation networks, utilities, agriculture, and population health.