Tornado Risk in Ohio

All Ohio counties ranked by FEMA National Risk Index tornado score

Tornado risk — violently rotating columns of air capable of catastrophic local damage — is rated for 88 of 88 Ohio counties in FEMA's National Risk Index. Hamilton County carries the state's highest tornado score at 99.4, with $53M in expected annual tornado losses.

10 Ohio counties are rated High or Very High for tornado, and expected annual losses from tornado total roughly $366M statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Tornado

#CountyTornado ScoreRatingAnn. Freq.Ann. Loss
1 Hamilton County
99.4
Very High 0.27 / yr $53M
2 Cuyahoga County
99.0
Very High 0.42 / yr $33M
3 Franklin County
98.4
High 0.29 / yr $29M
4 Butler County
98.0
High 0.33 / yr $28M
5 Lucas County
97.3
High 0.28 / yr $18M
6 Montgomery County
92.6
High 0.31 / yr $9M
7 Mahoning County
91.2
High 0.19 / yr $7M
8 Summit County
91.1
High 0.19 / yr $8M
9 Lorain County
90.9
High 0.34 / yr $8M
10 Trumbull County
90.8
High 0.28 / yr $6M
11 Stark County
87.7
Medium 0.27 / yr $7M
12 Medina County
84.6
Medium 0.19 / yr $6M
13 Clermont County
83.6
Medium 0.28 / yr $6M
14 Warren County
83.4
Medium 0.26 / yr $8M
15 Clark County
82.3
Medium 0.27 / yr $4M
16 Darke County
81.8
Medium 0.43 / yr $5M
17 Delaware County
81.5
Medium 0.24 / yr $7M
18 Greene County
81.3
Medium 0.27 / yr $5M
19 Wood County
80.5
Medium 0.32 / yr $7M
20 Ashtabula County
78.8
Medium 0.36 / yr $3M
21 Erie County
77.9
Medium 0.26 / yr $3M
22 Preble County
76.7
Medium 0.32 / yr $4M
23 Wayne County
76.1
Medium 0.26 / yr $3M
24 Miami County
75.4
Medium 0.27 / yr $4M
25 Lake County
75.2
Medium 0.23 / yr $4M
26 Williams County
74.4
Medium 0.21 / yr $3M
27 Allen County
74.3
Medium 0.25 / yr $3M
28 Ottawa County
72.8
Medium 0.25 / yr $3M
29 Fairfield County
71.6
Medium 0.22 / yr $3M
30 Sandusky County
71.4
Medium 0.19 / yr $3M
31 Portage County
70.5
Medium 0.23 / yr $3M
32 Columbiana County
70.0
Medium 0.24 / yr $2M
33 Shelby County
68.5
Medium 0.27 / yr $2M
34 Hancock County
67.3
Medium 0.30 / yr $4M
35 Huron County
67.3
Medium 0.23 / yr $2M
36 Mercer County
67.0
Medium 0.31 / yr $4M
37 Fulton County
66.9
Medium 0.20 / yr $3M
38 Holmes County
66.7
Medium 0.20 / yr $1M
39 Knox County
64.3
Low 0.25 / yr $2M
40 Defiance County
63.7
Low 0.22 / yr $2M
41 Marion County
62.9
Low 0.24 / yr $2M
42 Richland County
62.3
Low 0.25 / yr $2M
43 Licking County
61.5
Low 0.29 / yr $2M
44 Logan County
61.2
Low 0.30 / yr $2M
45 Geauga County
59.6
Low 0.16 / yr $2M
46 Seneca County
58.0
Low 0.28 / yr $2M
47 Auglaize County
58.0
Low 0.25 / yr $2M
48 Brown County
57.5
Low 0.26 / yr $1M
49 Ashland County
57.3
Low 0.20 / yr $2M
50 Muskingum County
56.3
Low 0.22 / yr $2M
51 Ross County
56.3
Low 0.36 / yr $1M
52 Highland County
56.2
Low 0.32 / yr $1M
53 Belmont County
55.5
Low 0.14 / yr $1M
54 Clinton County
55.5
Low 0.26 / yr $2M
55 Pickaway County
52.9
Low 0.27 / yr $2M
56 Paulding County
51.2
Low 0.23 / yr $1M
57 Jefferson County
50.2
Low 0.16 / yr $1M
58 Union County
49.5
Low 0.28 / yr $2M
59 Henry County
48.5
Low 0.22 / yr $1M
60 Putnam County
48.5
Low 0.28 / yr $2M
61 Lawrence County
48.3
Low 0.11 / yr $1M
62 Van Wert County
48.2
Low 0.26 / yr $1M
63 Coshocton County
46.8
Low 0.23 / yr $745K
64 Tuscarawas County
46.6
Low 0.25 / yr $847K
65 Champaign County
46.4
Low 0.28 / yr $1M
66 Scioto County
45.0
Low 0.23 / yr $975K
67 Madison County
43.9
Low 0.30 / yr $1M
68 Fayette County
43.3
Low 0.26 / yr $1M
69 Crawford County
42.0
Low 0.21 / yr $1M
70 Adams County
41.2
Low 0.27 / yr $832K
71 Morrow County
40.6
Low 0.22 / yr $939K
72 Wyandot County
40.5
Low 0.24 / yr $1M
73 Athens County
37.4
Low 0.14 / yr $699K
74 Pike County
37.4
Low 0.20 / yr $596K
75 Guernsey County
36.8
Low 0.16 / yr $588K
76 Hardin County
36.3
Low 0.29 / yr $930K
77 Jackson County
33.9
Low 0.14 / yr $458K
78 Hocking County
33.8
Low 0.16 / yr $599K
79 Washington County
33.1
Low 0.13 / yr $566K
80 Perry County
32.4
Low 0.14 / yr $547K
81 Carroll County
28.0
Low 0.17 / yr $396K
82 Gallia County
26.1
Very Low 0.12 / yr $294K
83 Meigs County
25.5
Very Low 0.11 / yr $252K
84 Noble County
24.7
Very Low 0.09 / yr $296K
85 Monroe County
23.9
Very Low 0.10 / yr $241K
86 Vinton County
21.3
Very Low 0.15 / yr $195K
87 Harrison County
18.2
Very Low 0.16 / yr $163K
88 Morgan County
17.0
Very Low 0.11 / yr $174K

88 Ohio counties with measurable tornado risk. See the national tornado ranking or all Ohio counties by overall risk.

Frequently Asked Questions

Which Ohio county has the highest tornado risk?

Hamilton County has the highest FEMA tornado risk score in Ohio at 99.4 (Very High), with $53M in expected annual losses and about 0.27 events per year.

How many Ohio counties face significant tornado risk?

88 Ohio counties record measurable tornado risk in FEMA's National Risk Index; 10 of them are rated High or Very High.

Other Hazards in Ohio