Sheridan County, Wyoming: Natural Disaster Risk and History
Sheridan County, Wyoming has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 65.2 out of 100, higher than about 65% of US counties, with wildfires, winter storms and avalanches scoring highest of its 18 hazards and $26 million a year in expected losses.
OpenFEMA lists 5 federal disaster declarations that included Sheridan County since 1978, not counting 2 for COVID-19; the latest is FM-5539-WY (Elk Fire, declared 30 September 2024). NOAA's Storm Prediction Center recorded 11 tornadoes touching Sheridan County from 1950 to 2025.
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Population 30,921 Buildings worth $7.6 billion Area 2,552 sq mi Risk rank in Wyoming 4 of 23 FIPS 56033
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Wildfire | Relatively Moderate | 93.9 | $2.8 million | about once every 164 years | — |
| Winter weather | Relatively High | 93.9 | $608,094 | about 26 a year | 492 |
| Avalanche | Relatively Moderate | 80.8 | $456,668 | about once every 30 years | 1 |
| Cold wave | Relatively Moderate | 77.1 | $3.2 million | about 2.1 a year | 40 |
| Landslide | Relatively Low | 76.3 | $10,988 | about 4.3 a year | — |
| Inland flooding | Relatively Moderate | 74.4 | $17 million | about once every 1.4 years | 20 |
| Lightning | Relatively Moderate | 68.9 | $497,960 | about 35 a year | 82,749 strikes |
| Earthquake | Relatively Low | 65.5 | $649,255 | about once every 877 years | — |
| Hail | Relatively Low | 60.8 | $406,746 | about 1.3 a year | 48 |
| Heat wave | Very Low | 33.5 | $171,513 | about 1.3 a year | 9.6 |
| Drought | Very Low | 23.0 | $8,476 | about 78 a year | 2,660 |
| Tornado | Very Low | 22.2 | $302,561 | about once every 4.9 years | 4 |
| Strong wind | Very Low | 15.9 | $140,474 | about once every 1.4 years | 27 |
| Ice storm | Very Low | 14.1 | $8,954 | about once every 67 years | 0 |
| Volcanic activity | Very Low | 11.1 | — | rarer than once in 1,000 years | 1 |
| 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 5
Most common: Fire 3, Severe Storm 1, Flood 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 1 | Flood |
| 2000s | 2 | Fire ×2 |
| 2010s | 1 | Severe Storm |
| 2020s | 1 | Fire |
The last 5
Widest declarations that included Sheridan County
- Severe Storms, Flooding, and Landslides (2011, DR-4007-WY): 15 Wyoming counties designated.
- Severe Storms, Flooding & Mudslides (1978, DR-557-WY): 12 Wyoming counties designated.
- Elk Fire (2024, FM-5539-WY): 1 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 11
| Tornadoes touching the county | 11 |
|---|---|
| Strongest-rated | (E)F1 ×5 |
| Peak month | June (8) |
| Deadliest | — |
| Longest path | 10 Jun 2004, F0, 3.6 mi path |
| Most recent | 10 Jun 2004, F0, 3.6 mi path |
| Deaths / injuries on those paths | 0 / 0 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 6 | 5 | 0 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 1 | 3 | 2 | 1 | 3 | 1 | 0 | 0 |
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 Sheridan County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Sheridan County (this page) | — | Relatively Low | 65.2 | Wildfire |
| Big Horn County, MT | 85 km | Relatively Low | 57.2 | Strong wind |
| Johnson County | 87 km | Very Low | 19.3 | Wildfire |
| Big Horn County | 93 km | Very Low | 31.1 | Landslide |
| Washakie County | 117 km | Very Low | 24.4 | Landslide |
| Powder River County, MT | 119 km | Very Low | 4.0 | Wildfire |
Nearest by distance between county centres. Every county in Wyoming, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively Low 32.4 |
|---|---|
| Community resilience | Relatively Moderate 50.9 |
| Community risk factor | 1.00 |
| Expected annual loss, all hazards | $26 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 Sheridan County's main hazards
- Right now: National Weather Service alerts for Wyoming · all official warnings on Global Incident Tracker.
- Wildfire: US wildfires now · Wildfire smoke: what protects you
- Winter weather: Power outages now · Carbon monoxide in winter
- Avalanche: Official warnings now
- 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 Sheridan County
What natural disasters is Sheridan County, Wyoming most at risk from?
Sheridan County, Wyoming has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 65.2 out of 100, higher than about 65% of US counties, with wildfires, winter storms and avalanches scoring highest of its 18 hazards and $26 million a year in expected losses.
How many federal disaster declarations has Sheridan County had?
OpenFEMA lists 5 federal disaster declarations that included Sheridan County since 1978, not counting 2 for COVID-19; the latest is FM-5539-WY (Elk Fire, declared 30 September 2024). Another 1 Wyoming declarations were made statewide without a county list.
How many tornadoes have hit Sheridan County?
NOAA's Storm Prediction Center recorded 11 tornadoes touching Sheridan County from 1950 to 2025.
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.