Wyoming ice storm risk
Laramie County has the highest ice storm risk in Wyoming, scoring 91.5 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Laramie County | 91.5 | Relatively High |
| 2 | Carbon County | 53.2 | Relatively Low |
| 3 | Albany County | 50.7 | Relatively Low |
| 4 | Goshen County | 50.3 | Relatively Low |
| 5 | Platte County | 48.7 | Relatively Low |
| 6 | Natrona County | 41.7 | Relatively Low |
| 7 | Fremont County | 17.7 | Very Low |
| 8 | Converse County | 17.2 | Very Low |
| 9 | Sweetwater County | 16.1 | Very Low |
| 10 | Campbell County | 15.4 | Very Low |
| 11 | Park County | 14.4 | Very Low |
| 12 | Sheridan County | 14.1 | Very Low |
| 13 | Teton County | 12.2 | Very Low |
| 14 | Lincoln County | 12.1 | Very Low |
| 15 | Uinta County | 9.6 | Very Low |
| 16 | Big Horn County | 8.9 | Very Low |
| 17 | Sublette County | 7.7 | Very Low |
| 18 | Crook County | 7.6 | Very Low |
| 19 | Washakie County | 7.2 | Very Low |
| 20 | Johnson County | 6.3 | Very Low |
| 21 | Weston County | 4.8 | Very Low |
| 22 | Hot Springs County | 4.7 | Very Low |
| 23 | Niobrara County | 4.1 | Very Low |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Ice Storm risk nationally:
Other hazard risks in Wyoming:
Frequently asked questions
What is the highest ice storm risk county in Wyoming?
Laramie County, WY has the highest ice storm risk in Wyoming, with a FEMA National Risk Index score of 91.5 out of 100 (rated "Relatively High").
What causes ice storm risk in Wyoming?
Ice storm risk covers damaging freezing rain and sleet accumulation, which collapses power lines, trees, and structures. The highest-risk counties cluster in a band from eastern Texas and Arkansas through the Carolinas and New England, where warm Gulf moisture overruns cold arctic air most frequently. Ice storms cause catastrophic and long-lasting power outages. Ice storm and sleet events are reported at forecast-zone level in NOAA Storm Events and are not included in county-level counts.