Wyoming heat wave risk
Sheridan County has the highest heat wave risk in Wyoming, scoring 33.5 out of 100 — rated "Very Low" by FEMA's National Risk Index. NOAA has recorded 42 heat wave events across Wyoming over the past decade.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Sheridan County | 33.5 | Very Low | 0 |
| 2 | Laramie County | 19.2 | Very Low | 2 |
| 3 | Natrona County | 17.2 | Very Low | 8 |
| 4 | Fremont County | 15.1 | Very Low | 10 |
| 5 | Goshen County | 13.6 | Very Low | 2 |
| 6 | Campbell County | 12.2 | Very Low | 0 |
| 7 | Platte County | 9.3 | Very Low | 0 |
| 8 | Big Horn County | 8.8 | Very Low | 6 |
| 9 | Park County | 8.2 | Very Low | 0 |
| 10 | Washakie County | 7.5 | Very Low | 8 |
| 11 | Converse County | 7 | Very Low | 0 |
| 12 | Johnson County | 6.7 | Very Low | 1 |
| 13 | Niobrara County | 5.6 | Very Low | 0 |
| 14 | Hot Springs County | 5.4 | Very Low | 1 |
| 15 | Weston County | 5 | Very Low | 0 |
| 16 | Crook County | 4.2 | Very Low | 0 |
| 17 | Teton County | 2.2 | Very Low | 0 |
| 18 | Lincoln County | 2.1 | Very Low | 0 |
| 19 | Albany County | 0 | No Rating | 0 |
| 20 | Carbon County | 0 | No Rating | 0 |
| 21 | Sublette County | 0 | No Rating | 1 |
| 22 | Sweetwater County | 0 | No Rating | 8 |
| 23 | Uinta County | 0 | No Rating | 0 |
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.
Heat Wave risk nationally:
Other hazard risks in Wyoming:
Frequently asked questions
What is the highest heat wave risk county in Wyoming?
Sheridan County, WY has the highest heat wave risk in Wyoming, with a FEMA National Risk Index score of 33.5 out of 100 (rated "Very Low").
What causes heat wave risk in Wyoming?
Heat is consistently the leading cause of weather-related mortality in the US, yet it remains underrepresented in federal disaster declarations relative to its actual impact. High scores reflect a combination of extreme temperature exposure, population vulnerability (elderly, outdoor workers), and limited access to cooling infrastructure.