Heat Wave Risk in Ohio
All Ohio counties ranked by FEMA National Risk Index heat wave score
Heat Wave risk — prolonged periods of extreme heat that threaten health and infrastructure — is rated for 88 of 88 Ohio counties in FEMA's National Risk Index. Franklin County carries the state's highest heat wave score at 98.9, with $25M in expected annual heat wave losses.
3 Ohio counties are rated High or Very High for heat wave, and expected annual losses from heat wave total roughly $119M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Heat Wave
| # | County | Heat Wave Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Franklin County | High | 4.16 / yr | $25M | |
| 2 | Hamilton County | High | 6.47 / yr | $25M | |
| 3 | Cuyahoga County | High | 2.21 / yr | $11M | |
| 4 | Scioto County | Medium | 5.68 / yr | $3M | |
| 5 | Summit County | Medium | 2.00 / yr | $3M | |
| 6 | Lawrence County | Medium | 4.58 / yr | $3M | |
| 7 | Montgomery County | Medium | 5.05 / yr | $3M | |
| 8 | Clermont County | Medium | 6.26 / yr | $3M | |
| 9 | Lucas County | Medium | 3.26 / yr | $2M | |
| 10 | Stark County | Medium | 2.00 / yr | $2M | |
| 11 | Gallia County | Medium | 4.53 / yr | $1M | |
| 12 | Butler County | Medium | 6.21 / yr | $2M | |
| 13 | Licking County | Medium | 3.79 / yr | $2M | |
| 14 | Fairfield County | Medium | 4.11 / yr | $2M | |
| 15 | Mahoning County | Low | 1.74 / yr | $1M | |
| 16 | Ross County | Low | 4.89 / yr | $1M | |
| 17 | Delaware County | Low | 3.58 / yr | $2M | |
| 18 | Trumbull County | Low | 1.68 / yr | $985K | |
| 19 | Athens County | Low | 3.16 / yr | $999K | |
| 20 | Jackson County | Low | 3.79 / yr | $742K | |
| 21 | Medina County | Low | 2.05 / yr | $1M | |
| 22 | Richland County | Low | 2.37 / yr | $862K | |
| 23 | Pike County | Low | 5.47 / yr | $659K | |
| 24 | Wayne County | Low | 2.26 / yr | $767K | |
| 25 | Lake County | Low | 1.32 / yr | $893K | |
| 26 | Meigs County | Low | 3.63 / yr | $511K | |
| 27 | Warren County | Low | 5.79 / yr | $1M | |
| 28 | Tuscarawas County | Low | 2.11 / yr | $574K | |
| 29 | Greene County | Low | 4.84 / yr | $883K | |
| 30 | Portage County | Low | 1.84 / yr | $865K | |
| 31 | Brown County | Low | 5.95 / yr | $564K | |
| 32 | Washington County | Low | 3.05 / yr | $660K | |
| 33 | Adams County | Low | 5.79 / yr | $650K | |
| 34 | Highland County | Low | 5.47 / yr | $675K | |
| 35 | Lorain County | Low | 2.21 / yr | $763K | |
| 36 | Clark County | Low | 4.16 / yr | $590K | |
| 37 | Muskingum County | Low | 2.32 / yr | $657K | |
| 38 | Columbiana County | Low | 1.79 / yr | $527K | |
| 39 | Clinton County | Low | 5.32 / yr | $607K | |
| 40 | Holmes County | Low | 2.32 / yr | $299K | |
| 41 | Knox County | Low | 2.47 / yr | $463K | |
| 42 | Pickaway County | Low | 4.32 / yr | $602K | |
| 43 | Belmont County | Low | 2.32 / yr | $454K | |
| 44 | Geauga County | Low | 1.58 / yr | $439K | |
| 45 | Allen County | Low | 4.74 / yr | $409K | |
| 46 | Jefferson County | Low | 1.84 / yr | $347K | |
| 47 | Ashtabula County | Low | 1.28 / yr | $332K | |
| 48 | Coshocton County | Low | 2.32 / yr | $255K | |
| 49 | Ashland County | Low | 2.37 / yr | $362K | |
| 50 | Union County | Low | 3.58 / yr | $647K | |
| 51 | Hocking County | Low | 4.16 / yr | $325K | |
| 52 | Guernsey County | Low | 2.26 / yr | $265K | |
| 53 | Wood County | Low | 3.42 / yr | $572K | |
| 54 | Perry County | Low | 2.95 / yr | $307K | |
| 55 | Fayette County | Low | 4.53 / yr | $341K | |
| 56 | Vinton County | Low | 3.42 / yr | $186K | |
| 57 | Miami County | Low | 4.05 / yr | $323K | |
| 58 | Marion County | Low | 2.84 / yr | $208K | |
| 59 | Erie County | Low | 2.42 / yr | $212K | |
| 60 | Sandusky County | Very Low | 3.00 / yr | $216K | |
| 61 | Fulton County | Very Low | 4.00 / yr | $207K | |
| 62 | Seneca County | Very Low | 3.11 / yr | $188K | |
| 63 | Carroll County | Very Low | 1.95 / yr | $151K | |
| 64 | Williams County | Very Low | 4.00 / yr | $148K | |
| 65 | Preble County | Very Low | 5.21 / yr | $178K | |
| 66 | Huron County | Very Low | 2.53 / yr | $168K | |
| 67 | Ottawa County | Very Low | 2.95 / yr | $172K | |
| 68 | Morgan County | Very Low | 2.95 / yr | $148K | |
| 69 | Madison County | Very Low | 4.05 / yr | $199K | |
| 70 | Auglaize County | Very Low | 3.95 / yr | $160K | |
| 71 | Shelby County | Very Low | 3.89 / yr | $131K | |
| 72 | Monroe County | Very Low | 2.37 / yr | $95K | |
| 73 | Hancock County | Very Low | 3.37 / yr | $228K | |
| 74 | Darke County | Very Low | 4.16 / yr | $149K | |
| 75 | Noble County | Very Low | 2.26 / yr | $103K | |
| 76 | Logan County | Very Low | 3.79 / yr | $128K | |
| 77 | Defiance County | Very Low | 4.32 / yr | $138K | |
| 78 | Morrow County | Very Low | 2.74 / yr | $121K | |
| 79 | Harrison County | Very Low | 2.05 / yr | $87K | |
| 80 | Champaign County | Very Low | 3.95 / yr | $127K | |
| 81 | Crawford County | Very Low | 2.79 / yr | $117K | |
| 82 | Putnam County | Very Low | 4.68 / yr | $139K | |
| 83 | Henry County | Very Low | 4.26 / yr | $110K | |
| 84 | Hardin County | Very Low | 3.74 / yr | $108K | |
| 85 | Van Wert County | Very Low | 4.74 / yr | $75K | |
| 86 | Mercer County | Very Low | 4.00 / yr | $83K | |
| 87 | Wyandot County | Very Low | 3.00 / yr | $61K | |
| 88 | Paulding County | Very Low | 4.68 / yr | $50K |
88 Ohio counties with measurable heat wave risk. See the national heat wave ranking or all Ohio counties by overall risk.
Frequently Asked Questions
Which Ohio county has the highest heat wave risk?
Franklin County has the highest FEMA heat wave risk score in Ohio at 98.9 (High), with $25M in expected annual losses and about 4.16 events per year.
How many Ohio counties face significant heat wave risk?
88 Ohio counties record measurable heat wave risk in FEMA's National Risk Index; 3 of them are rated High or Very High.