Grundy County, Illinois: hazard risk
FEMA rates Grundy County's overall risk Relatively Low (score 66.5 of 100, higher than 66% of rated U.S. counties); 1 of its 14 hazards are rated Relatively High or Very High, led by cold wave. Its storm record holds 495 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 |
|---|---|---|---|
| Cold Wave | Relatively High | 94.0 | $20M |
| Tornado | Relatively Moderate | 68.8 | $4.7M |
| Strong Wind | Relatively Moderate | 63.2 | $1.6M |
| Riverine Flooding | Relatively Low | 66.5 | $22M |
| Heat Wave | Relatively Low | 45.9 | $592K |
| Drought | Relatively Low | 37.3 | $101K |
| Winter Weather | Relatively Low | 25.8 | $47K |
| Earthquake | Very Low | 56.3 | $755K |
| Landslide | Very Low | 33.9 | $817 |
| Ice Storm | Very Low | 24.8 | $46K |
| Lightning | Very Low | 18.4 | $122K |
| Wildfire | Very Low | 15.7 | $11K |
| Hail | Very Low | 12.0 | $76K |
| Hurricane | Very Low | 9.4 | $3K |
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 | 197 | 0 | $9.0M | 29th of 102 | 789th of 3,080 |
| Hail | 75 | 0 | $2.2M | 55th of 102 | 1268th of 3,080 |
| Winter storms | 68 | 0 | $511K | 42nd of 102 | 900th of 3,077 |
| Floods | 43 | 0 | $72M | 42nd of 102 | 853rd of 3,080 |
| Extreme cold | 23 | 5 | – | 28th of 102 | 453rd of 3,076 |
| Tornadoes | 23 | 0 | $284M | 46th of 102 | 689th of 3,080 |
| High wind and dust storms | 20 | 0 | $143K | 28th of 102 | 921st of 3,080 |
| Drought | 13 | 0 | – | 41st of 102 | 1315th of 3,063 |
| Heat | 12 | 1 | – | 57th of 102 | 798th of 3,076 |
| Heavy rain | 10 | 0 | – | 25th of 102 | 557th of 3,080 |
| Lightning | 9 | 0 | $416K | 9th of 102 | 387th of 3,080 |
| Wildfires | 1 | 0 | – | 8th of 102 | 800th of 2,972 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full Grundy County record: every hazard by year and month, the deadliest events and FEMA's declarations.