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
| # | County | Tornado Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Hamilton County | Very High | 0.27 / yr | $53M | |
| 2 | Cuyahoga County | Very High | 0.42 / yr | $33M | |
| 3 | Franklin County | High | 0.29 / yr | $29M | |
| 4 | Butler County | High | 0.33 / yr | $28M | |
| 5 | Lucas County | High | 0.28 / yr | $18M | |
| 6 | Montgomery County | High | 0.31 / yr | $9M | |
| 7 | Mahoning County | High | 0.19 / yr | $7M | |
| 8 | Summit County | High | 0.19 / yr | $8M | |
| 9 | Lorain County | High | 0.34 / yr | $8M | |
| 10 | Trumbull County | High | 0.28 / yr | $6M | |
| 11 | Stark County | Medium | 0.27 / yr | $7M | |
| 12 | Medina County | Medium | 0.19 / yr | $6M | |
| 13 | Clermont County | Medium | 0.28 / yr | $6M | |
| 14 | Warren County | Medium | 0.26 / yr | $8M | |
| 15 | Clark County | Medium | 0.27 / yr | $4M | |
| 16 | Darke County | Medium | 0.43 / yr | $5M | |
| 17 | Delaware County | Medium | 0.24 / yr | $7M | |
| 18 | Greene County | Medium | 0.27 / yr | $5M | |
| 19 | Wood County | Medium | 0.32 / yr | $7M | |
| 20 | Ashtabula County | Medium | 0.36 / yr | $3M | |
| 21 | Erie County | Medium | 0.26 / yr | $3M | |
| 22 | Preble County | Medium | 0.32 / yr | $4M | |
| 23 | Wayne County | Medium | 0.26 / yr | $3M | |
| 24 | Miami County | Medium | 0.27 / yr | $4M | |
| 25 | Lake County | Medium | 0.23 / yr | $4M | |
| 26 | Williams County | Medium | 0.21 / yr | $3M | |
| 27 | Allen County | Medium | 0.25 / yr | $3M | |
| 28 | Ottawa County | Medium | 0.25 / yr | $3M | |
| 29 | Fairfield County | Medium | 0.22 / yr | $3M | |
| 30 | Sandusky County | Medium | 0.19 / yr | $3M | |
| 31 | Portage County | Medium | 0.23 / yr | $3M | |
| 32 | Columbiana County | Medium | 0.24 / yr | $2M | |
| 33 | Shelby County | Medium | 0.27 / yr | $2M | |
| 34 | Hancock County | Medium | 0.30 / yr | $4M | |
| 35 | Huron County | Medium | 0.23 / yr | $2M | |
| 36 | Mercer County | Medium | 0.31 / yr | $4M | |
| 37 | Fulton County | Medium | 0.20 / yr | $3M | |
| 38 | Holmes County | Medium | 0.20 / yr | $1M | |
| 39 | Knox County | Low | 0.25 / yr | $2M | |
| 40 | Defiance County | Low | 0.22 / yr | $2M | |
| 41 | Marion County | Low | 0.24 / yr | $2M | |
| 42 | Richland County | Low | 0.25 / yr | $2M | |
| 43 | Licking County | Low | 0.29 / yr | $2M | |
| 44 | Logan County | Low | 0.30 / yr | $2M | |
| 45 | Geauga County | Low | 0.16 / yr | $2M | |
| 46 | Seneca County | Low | 0.28 / yr | $2M | |
| 47 | Auglaize County | Low | 0.25 / yr | $2M | |
| 48 | Brown County | Low | 0.26 / yr | $1M | |
| 49 | Ashland County | Low | 0.20 / yr | $2M | |
| 50 | Muskingum County | Low | 0.22 / yr | $2M | |
| 51 | Ross County | Low | 0.36 / yr | $1M | |
| 52 | Highland County | Low | 0.32 / yr | $1M | |
| 53 | Belmont County | Low | 0.14 / yr | $1M | |
| 54 | Clinton County | Low | 0.26 / yr | $2M | |
| 55 | Pickaway County | Low | 0.27 / yr | $2M | |
| 56 | Paulding County | Low | 0.23 / yr | $1M | |
| 57 | Jefferson County | Low | 0.16 / yr | $1M | |
| 58 | Union County | Low | 0.28 / yr | $2M | |
| 59 | Henry County | Low | 0.22 / yr | $1M | |
| 60 | Putnam County | Low | 0.28 / yr | $2M | |
| 61 | Lawrence County | Low | 0.11 / yr | $1M | |
| 62 | Van Wert County | Low | 0.26 / yr | $1M | |
| 63 | Coshocton County | Low | 0.23 / yr | $745K | |
| 64 | Tuscarawas County | Low | 0.25 / yr | $847K | |
| 65 | Champaign County | Low | 0.28 / yr | $1M | |
| 66 | Scioto County | Low | 0.23 / yr | $975K | |
| 67 | Madison County | Low | 0.30 / yr | $1M | |
| 68 | Fayette County | Low | 0.26 / yr | $1M | |
| 69 | Crawford County | Low | 0.21 / yr | $1M | |
| 70 | Adams County | Low | 0.27 / yr | $832K | |
| 71 | Morrow County | Low | 0.22 / yr | $939K | |
| 72 | Wyandot County | Low | 0.24 / yr | $1M | |
| 73 | Athens County | Low | 0.14 / yr | $699K | |
| 74 | Pike County | Low | 0.20 / yr | $596K | |
| 75 | Guernsey County | Low | 0.16 / yr | $588K | |
| 76 | Hardin County | Low | 0.29 / yr | $930K | |
| 77 | Jackson County | Low | 0.14 / yr | $458K | |
| 78 | Hocking County | Low | 0.16 / yr | $599K | |
| 79 | Washington County | Low | 0.13 / yr | $566K | |
| 80 | Perry County | Low | 0.14 / yr | $547K | |
| 81 | Carroll County | Low | 0.17 / yr | $396K | |
| 82 | Gallia County | Very Low | 0.12 / yr | $294K | |
| 83 | Meigs County | Very Low | 0.11 / yr | $252K | |
| 84 | Noble County | Very Low | 0.09 / yr | $296K | |
| 85 | Monroe County | Very Low | 0.10 / yr | $241K | |
| 86 | Vinton County | Very Low | 0.15 / yr | $195K | |
| 87 | Harrison County | Very Low | 0.16 / yr | $163K | |
| 88 | Morgan County | 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.