Fremont County, Wyoming: Natural Disaster Risk and History
Fremont County, Wyoming has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 59.7 out of 100, higher than about 59% of US counties, with landslides, wildfires and earthquakes scoring highest of its 18 hazards and $19 million a year in expected losses.
OpenFEMA lists 4 federal disaster declarations that included Fremont County since 2010, not counting 2 for COVID-19; the latest is DR-4327-WY (Flooding, declared 5 August 2017). NOAA's Storm Prediction Center recorded 22 tornadoes touching Fremont County from 1950 to 2025.
Live weather alerts for Wyoming All official warnings Latest FEMA declarations
Population 39,175 Buildings worth $9.7 billion Area 9,359 sq mi Risk rank in Wyoming 5 of 23 FIPS 56013
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Landslide | Relatively Moderate | 97.1 | $264,902 | about 7.4 a year | — |
| Wildfire | Relatively Moderate | 92.6 | $1.9 million | about once every 532 years | — |
| Earthquake | Relatively Low | 86.2 | $2.7 million | about once every 123 years | — |
| Winter weather | Relatively Moderate | 84.4 | $232,284 | about 18 a year | 347 |
| Lightning | Relatively High | 83.9 | $773,900 | about 35 a year | 164,976 strikes |
| Avalanche | Relatively Moderate | 81.0 | $391,596 | about once a year | 30 |
| Cold wave | Relatively Moderate | 67.7 | $1.7 million | about once a year | 20 |
| Inland flooding | Relatively Low | 66.5 | $10 million | about 1.5 a year | 42 |
| Hail | Relatively Low | 36.5 | $137,995 | about once every 4.1 years | 9.3 |
| Drought | Relatively Low | 35.7 | $38,807 | about 76 a year | 2,849 |
| Strong wind | Relatively Low | 22.6 | $184,619 | about once every 3.5 years | 11 |
| Volcanic activity | Very Low | 22.5 | — | rarer than once in 1,000 years | 2 |
| Tornado | Very Low | 19.6 | $197,695 | about once every 2.9 years | 15 |
| Ice storm | Very Low | 17.7 | $11,417 | about once every 67 years | 0 |
| Heat wave | Very Low | 15.1 | $31,729 | about once every 9.4 years | 0 |
| Coastal flooding | Not Applicable | — | — | — | — |
| Hurricane | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 4
Most common: Flood 2, Fire 1, Severe Storm 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 2010s | 4 | Flood ×2, Fire, Severe Storm |
The last 4
Widest declarations that included Fremont County
- Severe Storms, Flooding, and Landslides (2011, DR-4007-WY): 15 Wyoming counties designated.
- Flooding (2017, DR-4327-WY): 3 Wyoming counties designated.
- Flooding (2010, DR-1923-WY): 2 Wyoming counties designated.
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Wyoming also had 1 statewide declaration with no county list.
Tornado record since 1950 22
| Tornadoes touching the county | 22 |
|---|---|
| Strongest-rated | (E)F3 ×1 |
| Peak month | June (9) |
| Deadliest | 6 Jun 1967, F2, 8.2 mi path, 0 killed, 2 injured |
| Longest path | 6 Jun 1967, F2, 8.2 mi path, 0 killed, 2 injured |
| Most recent | 11 Aug 2020, EF0, 0.2 mi path |
| Deaths / injuries on those paths | 0 / 4 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 9 | 9 | 3 | 1 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 0 | 6 | 3 | 3 | 3 | 3 | 3 | 1 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Fremont County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Fremont County (this page) | — | Relatively Low | 59.7 | Landslide |
| Hot Springs County | 77 km | Very Low | 16.1 | Landslide |
| Sublette County | 109 km | Very Low | 21.6 | Landslide |
| Washakie County | 123 km | Very Low | 24.4 | Landslide |
| Natrona County | 149 km | Relatively Low | 68.9 | Winter weather |
| Sweetwater County | 155 km | Very Low | 30.6 | Landslide |
Nearest by distance between county centres. Every county in Wyoming, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively Moderate 52.8 |
|---|---|
| Community resilience | Very Low 11.8 |
| Community risk factor | 1.19 |
| Expected annual loss, all hazards | $19 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Fremont County's main hazards
- Right now: National Weather Service alerts for Wyoming · all official warnings on Global Incident Tracker.
- Landslide: Landslides recorded
- Wildfire: US wildfires now · Wildfire smoke: what protects you
- Earthquake: Earthquakes today · Earthquake safety guide
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Fremont County
What natural disasters is Fremont County, Wyoming most at risk from?
Fremont County, Wyoming has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 59.7 out of 100, higher than about 59% of US counties, with landslides, wildfires and earthquakes scoring highest of its 18 hazards and $19 million a year in expected losses.
How many federal disaster declarations has Fremont County had?
OpenFEMA lists 4 federal disaster declarations that included Fremont County since 2010, not counting 2 for COVID-19; the latest is DR-4327-WY (Flooding, declared 5 August 2017). Another 1 Wyoming declarations were made statewide without a county list.
How many tornadoes have hit Fremont County?
NOAA's Storm Prediction Center recorded 22 tornadoes touching Fremont County from 1950 to 2025. The deadliest: 6 Jun 1967, F2, 8.2 mi path, 0 killed, 2 injured (deaths and injuries are for the whole path).
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.