Ice Storm Risk in Iowa

All Iowa counties ranked by FEMA National Risk Index ice storm score

Ice Storm risk — freezing rain that coats surfaces in heavy, damaging ice — is rated for 99 of 99 Iowa counties in FEMA's National Risk Index. Polk County carries the state's highest ice storm score at 91.7, with $1M in expected annual ice storm losses.

4 Iowa counties are rated High or Very High for ice storm, and expected annual losses from ice storm total roughly $12M statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Ice Storm

#CountyIce Storm ScoreRatingAnn. Freq.Ann. Loss
1 Polk County
91.7
High 0.93 / yr $1M
2 Linn County
85.9
High 0.31 / yr $805K
3 Woodbury County
85.6
High 0.91 / yr $631K
4 Scott County
85.2
High 0.63 / yr $739K
5 Pottawattamie County
81.1
Medium 0.91 / yr $513K
6 Johnson County
75.7
Medium 0.46 / yr $428K
7 Muscatine County
73.0
Medium 0.55 / yr $265K
8 Sioux County
71.8
Medium 0.97 / yr $421K
9 Plymouth County
70.3
Medium 1.01 / yr $251K
10 Dickinson County
70.0
Medium 1.05 / yr $278K
11 Clinton County
69.6
Medium 0.52 / yr $225K
12 Dallas County
68.5
Medium 0.83 / yr $375K
13 Black Hawk County
68.4
Medium 0.31 / yr $232K
14 Lyon County
67.9
Medium 1.20 / yr $303K
15 Des Moines County
67.0
Medium 0.48 / yr $194K
16 Carroll County
64.6
Medium 0.66 / yr $189K
17 Story County
64.2
Medium 0.68 / yr $209K
18 Crawford County
63.9
Medium 0.75 / yr $171K
19 Audubon County
62.0
Medium 0.84 / yr $140K
20 Sac County
56.7
Low 0.63 / yr $186K
21 Cass County
56.4
Low 0.76 / yr $88K
22 Madison County
55.9
Low 0.98 / yr $101K
23 Lee County
55.7
Low 0.33 / yr $108K
24 Webster County
54.1
Low 0.65 / yr $118K
25 Jasper County
54.1
Low 0.83 / yr $117K
26 Harrison County
53.7
Low 0.89 / yr $96K
27 Warren County
51.3
Low 0.84 / yr $148K
28 Buena Vista County
50.2
Low 0.69 / yr $84K
29 Marshall County
50.1
Low 0.56 / yr $84K
30 Louisa County
49.2
Low 0.50 / yr $105K
31 Dubuque County
48.6
Low 0.26 / yr $142K
32 Cherokee County
47.6
Low 0.86 / yr $75K
33 Washington County
47.0
Low 0.35 / yr $74K
34 Calhoun County
46.6
Low 0.63 / yr $69K
35 Cedar County
45.5
Low 0.50 / yr $113K
36 Osceola County
45.4
Low 1.05 / yr $63K
37 Benton County
45.2
Low 0.31 / yr $113K
38 Wapello County
45.0
Low 0.42 / yr $65K
39 Mahaska County
44.5
Low 0.63 / yr $76K
40 Iowa County
44.5
Low 0.43 / yr $79K
41 Monona County
43.2
Low 0.84 / yr $64K
42 O'Brien County
42.7
Low 0.86 / yr $107K
43 Poweshiek County
42.6
Low 0.59 / yr $70K
44 Marion County
42.5
Low 0.73 / yr $77K
45 Cerro Gordo County
42.1
Low 0.58 / yr $57K
46 Tama County
41.3
Low 0.41 / yr $49K
47 Page County
41.2
Low 0.57 / yr $54K
48 Shelby County
41.1
Low 0.90 / yr $89K
49 Hardin County
40.9
Low 0.65 / yr $56K
50 Mills County
40.6
Low 0.88 / yr $83K
51 Henry County
40.5
Low 0.27 / yr $52K
52 Adair County
40.3
Low 0.73 / yr $48K
53 Clay County
39.4
Low 0.79 / yr $77K
54 Greene County
39.3
Low 0.62 / yr $61K
55 Hamilton County
39.2
Low 0.65 / yr $58K
56 Jefferson County
39.2
Low 0.36 / yr $43K
57 Ida County
38.7
Low 0.79 / yr $52K
58 Wayne County
37.9
Low 0.36 / yr $37K
59 Boone County
37.5
Low 0.66 / yr $83K
60 Union County
36.9
Low 0.56 / yr $36K
61 Emmet County
36.8
Low 0.66 / yr $48K
62 Montgomery County
36.7
Low 0.64 / yr $47K
63 Jackson County
35.8
Low 0.47 / yr $54K
64 Kossuth County
35.7
Low 0.62 / yr $66K
65 Davis County
35.6
Low 0.35 / yr $30K
66 Guthrie County
35.1
Low 0.69 / yr $66K
67 Clarke County
34.4
Low 0.60 / yr $58K
68 Pocahontas County
33.9
Low 0.69 / yr $42K
69 Fayette County
33.7
Low 0.38 / yr $35K
70 Wright County
32.6
Low 0.67 / yr $37K
71 Fremont County
32.3
Low 0.85 / yr $41K
72 Jones County
31.3
Low 0.33 / yr $53K
73 Winneshiek County
29.6
Low 0.62 / yr $41K
74 Humboldt County
28.9
Low 0.68 / yr $35K
75 Appanoose County
28.8
Low 0.30 / yr $24K
76 Delaware County
28.7
Low 0.24 / yr $31K
77 Lucas County
28.1
Low 0.54 / yr $23K
78 Floyd County
27.9
Low 0.58 / yr $27K
79 Keokuk County
27.2
Low 0.43 / yr $31K
80 Allamakee County
27.1
Low 0.39 / yr $23K
81 Franklin County
27.0
Low 0.67 / yr $37K
82 Bremer County
26.2
Very Low 0.43 / yr $46K
83 Chickasaw County
25.6
Very Low 0.56 / yr $26K
84 Palo Alto County
25.6
Very Low 0.76 / yr $38K
85 Taylor County
25.5
Very Low 0.47 / yr $20K
86 Hancock County
24.9
Very Low 0.58 / yr $28K
87 Buchanan County
24.3
Very Low 0.24 / yr $37K
88 Winnebago County
22.7
Very Low 0.60 / yr $20K
89 Decatur County
22.7
Very Low 0.39 / yr $20K
90 Clayton County
21.6
Very Low 0.24 / yr $20K
91 Grundy County
21.4
Very Low 0.46 / yr $31K
92 Mitchell County
21.2
Very Low 0.69 / yr $22K
93 Howard County
21.1
Very Low 0.74 / yr $27K
94 Butler County
20.2
Very Low 0.52 / yr $27K
95 Monroe County
19.5
Very Low 0.46 / yr $22K
96 Adams County
18.9
Very Low 0.55 / yr $16K
97 Van Buren County
17.9
Very Low 0.32 / yr $10K
98 Ringgold County
16.7
Very Low 0.42 / yr $16K
99 Worth County
14.2
Very Low 0.71 / yr $13K

99 Iowa counties with measurable ice storm risk. See the national ice storm ranking or all Iowa counties by overall risk.

Frequently Asked Questions

Which Iowa county has the highest ice storm risk?

Polk County has the highest FEMA ice storm risk score in Iowa at 91.7 (High), with $1M in expected annual losses and about 0.93 events per year.

How many Iowa counties face significant ice storm risk?

99 Iowa counties record measurable ice storm risk in FEMA's National Risk Index; 4 of them are rated High or Very High.

Other Hazards in Iowa

Cold Wave Drought Earthquake Hail Heat Wave Hurricane Riverine Flood Landslide Lightning Strong Wind Tornado Wildfire Winter Weather