Riverton, WY
Local storm history & FEMA National Risk Index data
Riverton is rated Relatively Low for overall natural hazard risk — lower risk than most US counties — based on FEMA's National Risk Index for Fremont County, WY. The county's highest-rated hazards are landslide, wildfire, and earthquake.
Storm events near Riverton
NOAA-recorded tornado, hail, and flood events within 25 miles of Riverton's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Riverton itself, not the whole county.
County-wide hazard risk
Every other hazard FEMA and NOAA track — including drought — is only scored at the county level. These are Fremont County's FEMA National Risk Index scores, covering Riverton along with the rest of the county, not a Riverton-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 92.6 | Relatively Moderate |
| Inland Flooding | 66.5 | Relatively Low |
| Coastal Flooding | — | Not Applicable |
| Earthquake | 86.2 | Relatively Low |
| Heat Wave | 15.1 | Very Low |
| Tornado | 19.6 | Very Low |
| Avalanche | 81 | Relatively Moderate |
| Cold Wave | 67.7 | Relatively Moderate |
| Drought | 35.7 | Relatively Low |
| Hail | 36.5 | Relatively Low |
| Hurricane | — | Not Applicable |
| Ice Storm | 17.7 | Very Low |
| Landslide | 97.1 | Relatively Moderate |
| Lightning | 83.9 | Relatively High |
| Strong Wind | 22.6 | Relatively Low |
| Tsunami | — | Not Applicable |
| Volcanic Activity | 22.5 | Very Low |
| Winter Weather | 84.4 | Relatively Moderate |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Fremont County risk profile for disaster declarations, social vulnerability, and climate projection data.
More on Fremont County:
Frequently asked questions
What natural hazards is Riverton, WY at risk of?
Riverton is rated Relatively Low for overall natural hazard risk by FEMA's National Risk Index — lower risk than most US counties. The highest-rated hazards for Fremont County, where Riverton is located, are landslide, wildfire, and earthquake.
What is Riverton's biggest natural hazard risk?
Landslide is the highest-rated hazard for Fremont County, where Riverton is located, scoring 97.1 out of 100 on FEMA's National Risk Index (rated "Relatively Moderate").
Is Riverton a high-risk area for natural disasters?
No — Riverton carries lower risk than most US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively Low" for Fremont County.
Has Riverton had tornadoes, hail, or flooding?
NOAA has recorded 1 tornado, 19 hail, 19 inland flooding events within 25 miles of Riverton since 2016.