Sioux County, North Dakota: hazard risk
FEMA rates Sioux County's overall risk Relatively Low (score 62.1 of 100, higher than 62% of rated U.S. counties); 1 of its 13 hazards are rated Relatively High or Very High, led by cold wave. Its storm record holds 418 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 | 97.6 | $10M |
| Winter Weather | Relatively Moderate | 81.0 | $123K |
| Hail | Relatively Moderate | 77.4 | $422K |
| Strong Wind | Relatively Moderate | 62.9 | $436K |
| Wildfire | Relatively Low | 80.5 | $236K |
| Ice Storm | Relatively Low | 46.8 | $41K |
| Tornado | Very Low | 25.0 | $201K |
| Drought | Very Low | 24.0 | $5K |
| Lightning | Very Low | 19.7 | $37K |
| Landslide | Very Low | 17.2 | $45 |
| Heat Wave | Very Low | 16.3 | $24K |
| Riverine Flooding | Very Low | 10.0 | $726K |
| Earthquake | Very Low | 5.4 | $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. |
|---|---|---|---|---|---|
| Hail | 113 | 0 | $6.4M | 39th of 53 | 2229th of 3,080 |
| Winter storms | 106 | 0 | $18M | 28th of 53 | 1578th of 3,077 |
| High wind and dust storms | 67 | 0 | $87K | 10th of 53 | 687th of 3,080 |
| Severe thunderstorm wind | 60 | 0 | $2.7M | 42nd of 53 | 2630th of 3,080 |
| Extreme cold | 25 | 3 | – | 34th of 53 | 1028th of 3,076 |
| Tornadoes | 17 | 0 | $81K | 44th of 53 | 2279th of 3,080 |
| Floods | 14 | 2 | $2.5M | 27th of 53 | 2694th of 3,080 |
| Drought | 7 | 0 | – | 40th of 53 | 2144th of 3,063 |
| Wildfires | 4 | 0 | $934K | 1st of 53 | 618th of 2,972 |
| Heat | 1 | 0 | – | 29th of 53 | 2373rd of 3,076 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full Sioux County record: every hazard by year and month, the deadliest events and FEMA's declarations.