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Cassia County, Idaho
Recorded hazard history: storm events since 1950, federal disaster declarations since 1953, flood insurance claims since 1978, and FEMA's risk index.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. NCEI storm records through 30 Jun 2026; OpenFEMA declarations refreshed 1 Oct 2026; NFIP claims as of 8 Sep 2026.
Cassia County, Idaho, has 249 weather events in the NCEI Storm Events record since 1950, most of them damaging wind.
That is 9.7 events per 100 square miles, below the Idaho figure of 14.6, and 99.0 per 10,000 residents against 63.5 statewide.
14 events fall in the 12 months to 30 Jun 2026. NCEI attributes 4 deaths and 12 injuries to events in the county, with property damage estimated at $6.1M and crop damage at $6.0M.
FEMA has designated the county in 5 federal disaster declarations since 1953; the most recent is Covid-19 Pandemic (major disaster, 9 Apr 2020).
National Flood Insurance Program policyholders in the county filed 2 claims since 1978, of which 2 were paid, totalling $63K (about $32K per paid claim). FEMA counts 17 residential flood policies in force.
FEMA's National Risk Index rates the county's overall risk as "Relatively Low" and its expected annual loss as "Relatively Low" ($16M a year across 18 hazards).
Compared with Idaho and the United States
| Measure | Cassia County | Idaho | US |
|---|---|---|---|
| Recorded events since 1950 | 249 | 12,071 | 1,977,440 |
| Events per 100 square miles | 9.7 | 14.6 | 56.0 |
| Events per 10,000 residents | 99.0 | 63.5 | 59.6 |
| Events in the last 12 months | 14 | 580 | 62,008 |
| Deaths recorded by NCEI | 4 | 134 | 26,435 |
| Property damage (NCEI estimates) | $6.1M | $1.1B | $575B |
| NFIP claims per 1,000 residents | 0.1 | 0.6 | 8.1 |
| Average paid NFIP claim | $32K | $14K | $43K |
| Claims per 100 policies in force, last 10 years | 0.0 | 9.5 | 16.1 |
County-recorded events plus zone-recorded events whose forecast zone is named for the county. State and US rows include events recorded only by forecast zone. Rates use 2021 Census population and land area.
Events by decade
Trend: 119 events in the 20 years to 2025 against 96 in the 20 years before. Reporting practice changed in 1996 and again with automated reports in the 2000s, so decade totals measure the record as much as the weather.
Events by type
Hazard pages exist for hail, tornado, flood, wind and winter where the county has at least 10 recorded events. "Other" covers heavy rain, debris flow, dust, funnel clouds and similar reports.
Largest recorded events
| Date | Event type | Group | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|---|
| 10 Aug 1988 | Thunderstorm Wind | Wind | 60 mph | — | — | 2 | 10 | County |
| 17 Jul 1996 | Lightning | Lightning | — | — | — | 1 | 1 | County |
| 29 Jul 1996 | Flash Flood | Flood | — | — | — | 1 | 1 | County |
| 1 Aug 2014 | Heavy Rain | Other | — | — | $6.0M | — | — | County |
| 4 Feb 2017 | Flood | Flood | — | $5.2M | — | — | — | County |
| 22 Jun 2005 | Thunderstorm Wind | Wind | 63 mph | $200K | — | — | — | County |
| 1 Mar 2017 | Flood | Flood | — | $175K | — | — | — | County |
| 16 May 2005 | Flash Flood | Flood | — | $110K | — | — | — | County |
Ranked by deaths, then injuries, then NCEI's damage estimate. Deaths and injuries are NCEI counts (direct plus indirect); no personal details are recorded here.
Federal disaster declarations
| Declared | Number | Type | Incident | Title | Programs |
|---|---|---|---|---|---|
| 9 Apr 2020 | DR-4534 | Major disaster | Biological | Covid-19 Pandemic | Individual assistance, Public assistance |
| 13 Mar 2020 | EM-3467 | Emergency | Biological | Covid-19 | Public assistance |
| 21 Apr 2017 | DR-4310 | Major disaster | Flood | Severe Winter Storms And Flooding | Public assistance |
| 13 Sep 2005 | EM-3244 | Emergency | Hurricane | Hurricane Katrina | Public assistance |
| 31 Dec 1964 | DR-186 | Major disaster | Flood | Heavy Rains & Flooding | Individual assistance, Public assistance |
Declarations in which FEMA designated this county, from the OpenFEMA Disaster Declarations Summaries (v2). DR: major disaster; EM: emergency; FM: fire management assistance. Programs show whether individual or public assistance was made available.
Flood insurance claims
| Year of loss | Claims | Paid claims | Amount paid | Average paid |
|---|---|---|---|---|
| 2005 | 2 | 2 | $63,440 | $31,720 |
OpenFEMA NFIP claims (v3, as of 8 Sep 2026), aggregated by year of loss; amounts are building, contents and increased-cost-of-compliance payments as recorded. Repetitive-loss counts from the NFIP Multiple Loss Properties file (2 Aug 2026); policies in force from the NFIP Residential Penetration Rates file (3 Aug 2026).
National Risk Index
| Hazard (NRI) | Risk rating | Expected annual loss |
|---|---|---|
| Inland flooding | $8,085,008 | |
| Wildfire | $3,700,838 | |
| Earthquake | $1,243,092 | |
| Cold wave | $822,603 | |
| Heat wave | $571,957 | |
| Lightning | $547,125 | |
| Winter weather | $258,902 | |
| Strong wind | $243,778 | |
| Tornado | $70,274 | |
| Hail | $39,579 | |
| Drought | $14,724 | |
| Ice storm | $9,324 | |
| Landslide | $1,467 | |
| Avalanche | $1,291 | |
| Volcanic activity | $12 |
FEMA National Risk Index, December 2025 release. Ratings are FEMA's relative comparison of counties; expected annual loss is FEMA's modelled estimate of average yearly building, population and agriculture loss. See how to read the NRI.
Hurricane and tropical storm passes
No HURDAT2 track at tropical-storm strength passes within 100 miles of the county's centre point (through the 2025 season).
Questions and answers
How often does it hail in Cassia County, ID?
NCEI records 59 hail events in Cassia County since 1950, in 23 different years; that is about 0.8 recorded events a year. 6 reports were golf-ball size (1.75 in) or larger.
Has Cassia County had a tornado?
Yes. NCEI records 10 tornadoes in Cassia County since 1950, 0 of them rated (E)F2 or stronger. Tornado deaths recorded: 0.
When was the last federal disaster declaration for Cassia County?
9 Apr 2020: Covid-19 Pandemic, a major disaster declaration for biological. The county appears in 5 declarations since 1953.
How many flood insurance claims have been filed in Cassia County, and how much was paid?
2 NFIP claims since 1978, 2 of them paid, for $63K in total. FEMA publishes these figures redacted and aggregated; individual properties are not identified.
Is Cassia County in the National Risk Index's high-risk band?
FEMA's National Risk Index (December 2025) rates the county "Relatively Low" for overall risk, "Relatively Low" for expected annual loss, "Relatively Low" for social vulnerability and "Relatively Low" for community resilience. These ratings are FEMA's relative comparison across all US counties.
How does Cassia County compare with the rest of Idaho?
9.7 recorded events per 100 square miles against 14.6 statewide, and 0.1 NFIP claims per 1,000 residents against 0.6. The comparison table on this page shows each measure beside the state and national figures.
Provenance
Storm events: NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026 (public domain). Declarations: OpenFEMA DisasterDeclarationsSummaries v2, refreshed 1 Oct 2026. Flood claims: OpenFEMA NfipClaims v3 as of 8 Sep 2026; NfipMultipleLossProperties v1 (2 Aug 2026); NfipResidentialPenetrationRates v1 (3 Aug 2026). Risk index: FEMA National Risk Index, December 2025. Hurricane tracks: NHC HURDAT2 through 2025. Population and area: US Census Bureau, 2021 vintage. Built 1 Oct 2026; see the methodology and corrections pages. Hazard hubs: Hail · Tornado · Flood · Wind · Winter.