Wyoming cold wave risk
Laramie County has the highest cold wave risk in Wyoming, scoring 93.4 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Laramie County | 93.4 | Relatively High |
| 2 | Campbell County | 87.5 | Relatively Moderate |
| 3 | Albany County | 86.3 | Relatively Moderate |
| 4 | Park County | 85 | Relatively Moderate |
| 5 | Natrona County | 82.5 | Relatively Moderate |
| 6 | Sheridan County | 77.1 | Relatively Moderate |
| 7 | Converse County | 72.1 | Relatively Moderate |
| 8 | Carbon County | 70.1 | Relatively Moderate |
| 9 | Goshen County | 69.3 | Relatively Moderate |
| 10 | Fremont County | 67.7 | Relatively Moderate |
| 11 | Platte County | 66.4 | Relatively Moderate |
| 12 | Crook County | 58.7 | Relatively Low |
| 13 | Sweetwater County | 58.2 | Relatively Low |
| 14 | Big Horn County | 57.9 | Relatively Low |
| 15 | Weston County | 52.4 | Relatively Low |
| 16 | Niobrara County | 43 | Relatively Low |
| 17 | Johnson County | 39.5 | Relatively Low |
| 18 | Washakie County | 33.1 | Relatively Low |
| 19 | Hot Springs County | 28.9 | Relatively Low |
| 20 | Teton County | 22.5 | Very Low |
| 21 | Uinta County | 20.6 | Very Low |
| 22 | Sublette County | 19.7 | Very Low |
| 23 | Lincoln County | 15.4 | 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.
Cold Wave risk nationally:
Other hazard risks in Wyoming:
Frequently asked questions
What is the highest cold wave risk county in Wyoming?
Laramie County, WY has the highest cold wave risk in Wyoming, with a FEMA National Risk Index score of 93.4 out of 100 (rated "Relatively High").
What causes cold wave risk in Wyoming?
Cold wave risk captures expected losses from extended periods of extreme cold, including wind chill. The northern Plains, Great Lakes, and interior New England see the most severe and frequent cold events. Cold extremes cause significant excess mortality, especially among unhoused populations, the elderly, and those with inadequate heating or insulation. Cold and wind chill events are reported at forecast-zone level in NOAA Storm Events and are not included in county-level counts.