Fremont County, Wyoming
County storm and disaster record · FIPS 56013 · population 39,175 · 9,184 sq mi
NOAA's Storm Events Database holds 1,945 records for Fremont County, Wyoming from 1950 through June 30, 2026, on 1,032 days; the most frequent are winter storm records (729 records). 1,480 of them are forecast-zone records, which the National Weather Service files once per zone: a county covered by several zones receives each one, so a single storm can add several records on the same day. The deadliest single record is the December 21, 2011 winter weather, filed for the forecast zone Wind River Basin, which covers the county: 1 death, 3 injuries and $33,000 in damage in 2025 dollars. FEMA has issued 6 declarations naming the county since 2010, 4 of them for natural hazards; the latest for a natural hazard was “Flooding” on August 5, 2017.
The record, 1950 to 2026
Storm records filed for the county each year (2026 to June 30, 2026). Before 1996 NOAA recorded only tornadoes (from 1950), thunderstorm wind and hail (from 1955).
- recorded, no damage figure
- under $100,000
- $100,000 or more
- $1 million or more
- $10 million or more, or a death
- $100 million or more, or 10 deaths
- a year's colour: its recorded damage or deaths
- a year with a death
- 1955: wind and hail recorded from 1955
- 1996: all 48 event types from 1996
- Storm records
- 1,945on 1,032 days, 1950 to June 30, 2026
- Deaths recorded
- 722 injuries
- Damage, 2025 dollars
- $35Mas filed (scale steps before 1993)
- Tornadoes
- 23strongest F3
- FEMA declarations
- 6latest 2020
Source: NOAA NCEI Storm Events Database, records through June 30, 2026 (file revision 20260918); damage converted to 2025 dollars with the BLS CPI-U. Search the record at NCEI. BLS consumer price index.
What hazards hit Fremont County most?
The most frequent records are winter storm records: 729 since 1996. The rank column places the county among Wyoming's counties by days with a record per 1,000 square miles of land over each hazard's complete period.
| Hazard | Records | Days | First, last | Killed | Injured | Damage | Rank in state |
|---|---|---|---|---|---|---|---|
| Winter storms | 729 | 336 | 1996-2026 | 1 | 5 | $983K | 16 of 23 |
| High wind and dust storms | 624 | 405 | 1996-2026 | 0 | 0 | $777K | 8 of 23 |
| Severe thunderstorm wind | 218 | 147 | 1964-2026 | 1 | 0 | $232K | 13 of 23 |
| Hail | 137 | 83 | 1958-2026 | 0 | 0 | $2.9M | 16 of 23 |
| Floods | 66 | 43 | 1997-2025 | 1 | 0 | $23M | 11 of 23 |
| Extreme cold | 61 | 17 | 1996-2025 | 0 | 0 | – | 20 of 23 |
| Wildfires | 38 | 35 | 1999-2025 | 0 | 10 | $4.0M | 6 of 23 |
| Tornadoes | 23 | 21 | 1962-2026 | 0 | 4 | $2.5M | 16 of 23 |
| Heat | 22 | 11 | 2019-2026 | 0 | 0 | – | 7 of 23 |
| Fog, smoke and funnel clouds | 14 | 11 | 1997-2015 | 0 | 0 | – | 18 of 23 |
| Landslides and avalanches | 8 | 8 | 2005-2025 | 4 | 2 | – | 8 of 23 |
| Lightning | 4 | 4 | 2009-2012 | 0 | 1 | $372K | 11 of 23 |
| Heavy rain | 1 | 1 | 1999-1999 | 0 | 0 | – | 12 of 23 |
Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.
How many tornadoes has Fremont County had?
NOAA records 23 tornadoes in Fremont County from 1962 to 2026, the strongest rated F3, with 0 deaths and 4 injuries recorded in the county. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.
Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 22 tornadoes whose track touched Fremont County since 1950 (NOAA's county records number 23: they file a crossing tornado once per county segment, and the two databases differ on some tracks); along their whole tracks they killed 0 people.
| Date | Tornado | Rating | Path | Killed |
|---|---|---|---|---|
| 1962-06-16 16:50, as SPC files it | Unnamed | F3 | 0.5 mi | 0 |
Map of the strongest tornado tracks in Wyoming.
Every tornado record filed for Fremont County (23)
| Date | Place | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2026-06-25 | Jeffrey City, Fremont County | EF0 0.9 mi x 30 yd | 0 | 0 | – |
| 2020-08-11 | Riverton Regional A, Fremont County | EF0 0.19 mi x 20 yd | 0 | 0 | – |
| 2018-05-28 | South Pass, Fremont County | EF0 0.49 mi x 20 yd | 0 | 0 | – |
| 2014-05-06 | Midvale, Fremont County | EF1 1.52 mi x 50 yd | 0 | 0 | $15K |
| 2014-05-06 | Midvale, Fremont County | EF0 4.79 mi x 30 yd | 0 | 0 | – |
| 2009-06-03 | Jeffrey City, Fremont County | EF0 0.9 mi x 50 yd | 0 | 0 | – |
| 2008-05-28 | Dubois, Fremont County | EF0 0.04 mi x 10 yd | 0 | 1 | $14K |
| 2004-09-30 | Milford, Fremont County | F0 1 mi x 50 yd | 0 | 0 | – |
| 1999-04-28 | Moneta, Fremont County | F0 0.1 mi x 50 yd | 0 | 0 | – |
| 1999-04-28 | Shoshoni, Fremont County | F0 1 mi x 100 yd | 0 | 0 | – |
| 1997-06-06 | Riverton, Fremont County | F1 2 mi x 40 yd | 0 | 0 | – |
| 1989-07-09 | Fremont County | F0 0.2 mi x 13 yd | 0 | 0 | – |
| 1986-06-07 | Fremont County | F2 2 mi x 50 yd | 0 | 0 | $250K step |
| 1980-08-03 | Fremont County | F1 | 0 | 0 | $250K step |
| 1977-06-20 | Fremont County | F1 2 mi x 20 yd | 0 | 0 | $250 step |
| 1976-08-03 | Fremont County | F1 | 0 | 0 | – |
| 1973-08-27 | Fremont County | F2 0.5 mi x 200 yd | 0 | 0 | $25K step |
| 1968-06-06 | Fremont County | F1 3 mi x 50 yd | 0 | 0 | $25K step |
| 1968-06-05 | Fremont County | F1 | 0 | 0 | $3K step |
| 1967-06-14 | Fremont County | F1 0.5 mi x 17 yd | 0 | 1 | $25K step |
| 1967-06-06 | Fremont County | F2 8.2 mi x 33 yd | 0 | 2 | $250 step |
| 1964-04-23 | Fremont County | F1 0.5 mi x 17 yd | 0 | 0 | $25K step |
| 1962-06-16 | Fremont County | F3 0.5 mi x 67 yd | 0 | 0 | $3K step |
A damage figure marked "step" is a record from before 1993: NOAA then filed damage by category, and the figure is the category as entered, in the dollars of that year, not an estimate of the loss.
Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.
When was the last damaging storm in Fremont County?
The most recent record with damage, injuries or deaths is the February 16, 2026 high wind ($1,000 in damage in 2025 dollars).
| Date | Record | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2026-06-29 | High WindFremont County and 2 more · forecast zone Green Mountains & Rattlesnake Range | 53 kt wind | 0 | 0 | – |
| 2026-06-27 | Thunderstorm WindShoshoni, Fremont County | 60 kt wind | 0 | 0 | – |
| 2026-06-27 | Thunderstorm WindLander, Fremont County | 63 kt wind | 0 | 0 | – |
| 2026-06-27 | Thunderstorm WindHunt Field Lander, Fremont County | 57 kt wind | 0 | 0 | – |
| 2026-06-25 | TornadoJeffrey City, Fremont County | EF0 0.9 mi x 30 yd | 0 | 0 | – |
| 2026-06-25 | Thunderstorm WindJeffrey City, Fremont County | 55 kt wind | 0 | 0 | – |
| 2026-06-24 | HailArapahoe, Fremont County | 0.75 in hail | 0 | 0 | – |
| 2026-06-21 | Thunderstorm WindRiverton Airport, Fremont County | 54 kt wind | 0 | 0 | – |
| 2026-06-20 | Thunderstorm WindHunt Field Lander, Fremont County | 70 kt wind | 0 | 0 | – |
| 2026-06-20 | Thunderstorm WindPavillion, Fremont County | 58 kt wind | 0 | 0 | – |
| 2026-06-10 | High WindFremont County and 3 more · forecast zone Upper Green River Basin | 58 kt wind | 0 | 0 | – |
| 2026-06-10 | High WindFremont County and 2 more · forecast zone Green Mountains & Rattlesnake Range | 55 kt wind | 0 | 0 | – |
Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.
The deadliest and costliest records
| Date | Record | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2011-12-21 | Winter WeatherFremont County · forecast zone Wind River Basin A 48-year-old woman was killed when her light truck rolled four times north of Shoshoni near milepost 105.6 on U.S. Highway 20. Several other accidents were reported including a three car pileup that sent three people to the hospital with non-life threatening injuries. | 1 | 3 | $33K | |
| 2025-01-04 | AvalancheFremont County and 3 more · forecast zone Teton & Gros Ventre Mountains Summary from the USDA FS Bridger Teton Avalanche Center report titled Radio Tower Peak Avalanche Accident: On Saturday, January 4 2025, at approximately 11 am, a group of four skiers unintentionally triggered an avalanche on a north-facing, sparsely treed slope above a steep-walled gully approximately one mile from ... | 1 | 1 | – | |
| 2025-12-20 | AvalancheFremont County and 3 more · forecast zone Teton & Gros Ventre Mountains Excerpt from the Bridger-Teton Avalanche Center Accident Report: On Saturday, December 20, 2025 at approximately 2 PM, one skier in a party of two unintentionally triggered an avalanche on a north-facing, steep, rocky, and sparsely treed chute known as The Claw approximately two miles south of the main parking lot at ... | 1 | 0 | – | |
| 2023-07-03 | Thunderstorm WindHunt Field Lander, Fremont County A line of thunderstorms moved eastward across the Wind River Basin and Lander Foothills and brought high wind gusts. The maximum gust reported was 69 mph at the Riverton airport. Other notable gusts included 66 mph at the Lander airport and 58 mph at Shoshoni. There were numerous reports of large tree limbs blown down ... | 60 kt wind | 1 | 0 | – |
| 2017-02-21 | FloodRiverton, Fremont County Law enforcement reported flooding ditches and sheet flooding north of Riverton on the evening of February 21st. A 33-year old man fell into the flood waters and drowned. A Coroners report noted that the man was under the influence of alcohol, marijuana, amphetamines and anti-depressants. | 1 | 0 | $12K | |
| 2009-01-02 | AvalancheFremont County and 2 more · forecast zone Absaroka Mountains An ice climber was killed when an avalanche one-quarter mile across swept 2,000 feet down a mountainside and spilled over the edge of a steep slope he was climbing. His climbing partner was uninjured. The two climbers experienced two smaller avalanches prior to the fatal slide during their more than 1,000 foot ascent. ... | 1 | 0 | – | |
| 2005-12-27 | AvalancheFremont County · forecast zone Wind River Mountains East An avalanche killed a 21 year-old man who was snowmobiling near Togwotee Pass. It took Search and Rescue two days to find the man, who was buried under 12 feet of snow, due to inclement weather and additional avalanches. A companion escaped injury because he was riding above where the snow broke free. | 1 | 0 | – | |
| 2004-09-18 | WildfireFremont County · forecast zone Wind River Basin A human caused fire was started near Goes In Lodge Road on the Wind River Indian Reservation south of Riverton during the afternoon. The fire threatened urban areas on the south side of Riverton by late afternoon. The fire was fueled by dry southwesterly wind that gusted between 30 and 35 mph at times. A total of nine ... | 0 | 9 | $1.6M |
| Date | Record | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2010-06-04 | FloodSinks Canyon Sp, Fremont County | 0 | 0 | $16M | |
| 2023-06-23 | HailSt Stephens, Fremont County | 1.75 in hail | 0 | 0 | $2.9M |
| 2017-06-04 | FloodRiverton Regional A, Fremont County | 0 | 0 | $2.4M | |
| 2004-09-18 | WildfireFremont County · forecast zone Wind River Basin | 0 | 9 | $1.6M | |
| 2016-05-07 | FloodSweetwater Station, Fremont County | 0 | 0 | $1.5M | |
| 2006-04-10 | WildfireFremont County · forecast zone Lander Foothills | 0 | 0 | $1.5M | |
| 2011-06-24 | FloodRiverton, Fremont County | 0 | 0 | $872K | |
| 2011-07-01 | FloodRiverton, Fremont County | 0 | 0 | $787K |
Before 1993 NOAA filed damage by category, not amount, so the list above starts in 1993. The highest category filed here before then (entered as $250K, in the dollars of the day) holds: August 3, 1980 (tornado, Fremont County); June 7, 1986 (tornado, Fremont County).
Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.
Is it getting more frequent?
Records per decade for Fremont County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).
| Hazard | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020-26 |
|---|---|---|---|---|---|---|---|---|
| Winter storms | – | – | – | – | 83 | 207 | 257 | 182 |
| High wind and dust storms | – | – | – | – | 31 | 102 | 279 | 212 |
| Severe thunderstorm wind | 0 | 5 | 4 | 27 | 12 | 41 | 59 | 70 |
| Hail | 1 | 1 | 4 | 8 | 15 | 56 | 38 | 14 |
| Floods | – | – | – | – | 6 | 11 | 39 | 10 |
| Extreme cold | – | – | – | – | 16 | 4 | 14 | 27 |
Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).
What time of year?
Records by month in Fremont County. The two busiest months are in violet.
The values, month by month
Jan 226 · Feb 249 · Mar 217 · Apr 140 · May 122 · Jun 191 · Jul 123 · Aug 73 · Sep 100 · Oct 119 · Nov 142 · Dec 243 (records).
Source: NOAA NCEI Storm Events Database, records by the month they began.
Federal disaster declarations for Fremont County
FEMA's register lists 6 declarations that include Fremont County: 4 major disasters, one emergency and one fire management assistance declaration. Most were for biological (2) and flood (2).
| Declared | Number | Type | Title |
|---|---|---|---|
| 2020-04-11 | DR-4535 | Biological | Covid-19 Pandemic |
| 2020-03-13 | EM-3479 | Biological | Covid-19 |
| 2017-08-05 | DR-4327 | Flood | Flooding |
| 2016-07-25 | FM-5136 | Fire | Lava Mountain Fire |
| 2011-07-22 | DR-4007 | Severe Storm | Severe Storms, Flooding, and Landslides |
| 2010-07-14 | DR-1923 | Flood | Flooding |
Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.
How many floods has Fremont County had?
NOAA's Storm Events Database holds 66 flood or flash flood records for Fremont County from 1997 to 2025, on 43 days, with 1 death. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Fremont County ranks 2155th of 2,942 U.S. counties.
The National Flood Insurance Program has paid $50,000 on 17 claims filed in Fremont County; the most in one year was 6 in 2010. Claims count insured losses only: uninsured flood damage is not in this file.
The values, year by year
1986: 1 · 1989: 1 · 1991: 1 · 1995: 1 · 2010: 6 · 2016: 3 · 2017: 3 · 2019: 1; the other years: 0.
Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.
FEMA's modeled risk for Fremont County
FEMA's National Risk Index rates Fremont County Relatively Low overall, with an expected annual loss of $18.6 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.
| Hazard | Risk rating | Expected annual loss | Modeled frequency |
|---|---|---|---|
| Lightning | Relatively High | $774K | 35 a year (modeled) |
| Landslide | Relatively Moderate | $265K | 7.4 a year (modeled) |
| Wildfire | Relatively Moderate | $1.9M | once in about 531 years (modeled) |
| Winter Weather | Relatively Moderate | $232K | 18 a year (modeled) |
| Avalanche | Relatively Moderate | $392K | 1 a year (modeled) |
| Cold Wave | Relatively Moderate | $1.7M | 1 a year (modeled) |
| Earthquake | Relatively Low | $2.7M | once in about 123 years (modeled) |
| Riverine Flooding | Relatively Low | $10M | 1.5 a year (modeled) |
Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.
Counties that share a border with Fremont County
Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.
Next
- Tornadoes in WyomingEvery Wyoming tornado since 1950 and the counties with the most per square mile
- Winter storms in WyomingThe state's winter storm records, by county, year and month
- The Wyoming recordEvery hazard in the state, its deadliest events and its federal declarations
- FEMA's risk rating for each hazard in Fremont CountyThe hazard risk calculator: 18 hazards beside the county's record
- Download Fremont County's FEMA declarations (CSV)6 rows: every declaration that named the county, for your own analysis