Ontario County, New York: hazard risk
FEMA rates Ontario County's overall risk Relatively Low (score 63.5 of 100, higher than 63% of rated U.S. counties). Its storm record holds 644 events since 1950.
FEMA's rating for each hazard
These are FEMA's county-wide model ratings and this county's storm record. They are not an assessment of any property, address or building, and not insurance advice: a property's risk depends on its own elevation, construction and location.
FEMA gives each hazard its own rating, and a rating does not follow the score from one hazard to the next: a hazard with a higher score can carry a lower rating than another. The table sorts by FEMA's rating, then by score (0 to 100, the county against every other county for that hazard).
| Hazard | Risk rating | Score | Expected annual loss |
|---|---|---|---|
| Riverine Flooding | Relatively Moderate | 78.8 | $21M |
| Ice Storm | Relatively Moderate | 77.1 | $379K |
| Strong Wind | Relatively Moderate | 76.4 | $1.3M |
| Drought | Relatively Moderate | 75.7 | $818K |
| Hurricane | Relatively Low | 58.9 | $211K |
| Hail | Relatively Low | 57.3 | $394K |
| Lightning | Relatively Low | 55.8 | $326K |
| Heat Wave | Relatively Low | 47.0 | $369K |
| Tornado | Relatively Low | 44.0 | $1.2M |
| Landslide | Very Low | 54.9 | $2K |
| Earthquake | Very Low | 53.1 | $366K |
| Avalanche | Very Low | 43.9 | $388 |
| Wildfire | Very Low | 38.3 | $26K |
| Winter Weather | Very Low | 18.8 | $19K |
| Cold Wave | Very Low | 12.5 | $131K |
Source: FEMA National Risk Index, December 2025 release. A model of future loss, not a count of past events. FEMA's National Risk Index map.
What the record holds
| Hazard | Records | Deaths | Damage | Rank in state | Rank in U.S. |
|---|---|---|---|---|---|
| Severe thunderstorm wind | 349 | 2 | $5.4M | 29th of 58 | 1168th of 3,080 |
| Floods | 82 | 0 | $21M | 35th of 58 | 1262nd of 3,080 |
| Winter storms | 69 | 0 | $9.4M | 54th of 58 | 1424th of 3,077 |
| Hail | 50 | 0 | $2.3M | 41st of 58 | 2428th of 3,080 |
| High wind and dust storms | 38 | 1 | $3.4M | 31st of 58 | 721st of 3,080 |
| Extreme cold | 29 | 0 | $68K | 22nd of 58 | 584th of 3,076 |
| Heavy rain | 10 | 0 | – | 23rd of 58 | 1392nd of 3,080 |
| Tornadoes | 7 | 0 | $1.9M | 33rd of 58 | 2384th of 3,080 |
| Drought | 5 | 0 | – | 25th of 58 | 2085th of 3,063 |
| Lightning | 5 | 0 | $175K | 30th of 58 | 891st of 3,080 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full Ontario County record: every hazard by year and month, the deadliest events and FEMA's declarations.