Sublette County, Wyoming
County storm and disaster record · FIPS 56035 · population 8,723 · 4,886 sq mi
NOAA's Storm Events Database holds 916 records for Sublette County, Wyoming from 1950 through June 30, 2026, on 519 days; the most frequent are winter storm records (598 records). 811 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 February 27, 2009 avalanche, filed for the forecast zone Teton & Gros Ventre Mountains, which covers the county: 3 deaths. FEMA has issued 4 declarations naming the county since 1977, 2 of them for natural hazards; the latest for a natural hazard was “Roosevelt Fire” on September 18, 2018.
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
- 916on 519 days, 1950 to June 30, 2026
- Deaths recorded
- 4243 injuries
- Damage, 2025 dollars
- $14Mas filed (scale steps before 1993)
- Tornadoes
- 8strongest EF1
- FEMA declarations
- 4latest 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 Sublette County most?
The most frequent records are winter storm records: 598 since 1996. 42% of its winter storm records since 1996 fell in January and February. 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 | 598 | 295 | 1996-2026 | 0 | 3 | $18K | 11 of 23 |
| High wind and dust storms | 74 | 55 | 1996-2026 | 0 | 0 | $886K | 20 of 23 |
| Landslides and avalanches | 65 | 61 | 2006-2025 | 41 | 32 | $86K | 2 of 23 |
| Severe thunderstorm wind | 57 | 39 | 1983-2026 | 0 | 0 | $939K | 23 of 23 |
| Extreme cold | 33 | 15 | 1996-2025 | 0 | 0 | – | 16 of 23 |
| Wildfires | 27 | 20 | 2002-2025 | 0 | 3 | $12M | 5 of 23 |
| Hail | 18 | 13 | 1971-2025 | 0 | 0 | – | 21 of 23 |
| Fog, smoke and funnel clouds | 14 | 11 | 1997-2018 | 0 | 0 | – | 10 of 23 |
| Floods | 11 | 8 | 1999-2018 | 0 | 0 | $80K | 19 of 23 |
| Tornadoes | 8 | 8 | 1975-2026 | 0 | 0 | $24K | 20 of 23 |
| Heat | 7 | 6 | 2020-2026 | 0 | 0 | – | 6 of 23 |
| Lightning | 4 | 4 | 2001-2010 | 1 | 5 | $61K | 6 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 Sublette County had?
NOAA records 8 tornadoes in Sublette County from 1975 to 2026, the strongest rated EF1, with 0 deaths and 0 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 7 tornadoes whose track touched Sublette County since 1950 (NOAA's county records number 8: 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.
Map of the strongest tornado tracks in Wyoming.
Every tornado record filed for Sublette County (8)
| Date | Place | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2026-06-20 | Marbleton, Sublette County | EF0 0.62 mi x 30 yd | 0 | 0 | – |
| 2024-09-04 | New Fork, Sublette County | EF0 0.06 mi x 10 yd | 0 | 0 | – |
| 2019-04-26 | Marbleton, Sublette County | EF0 0.1 mi x 20 yd | 0 | 0 | $23K |
| 2016-09-04 | Warren Bridge, Sublette County | EF1 2.42 mi x 300 yd | 0 | 0 | $1K |
| 2014-05-31 | Green River Lakes, Sublette County | EF0 0.32 mi x 30 yd | 0 | 0 | – |
| 1997-07-19 | Big Piney, Sublette County | F0 3 mi x 100 yd | 0 | 0 | – |
| 1991-05-02 | Sublette County | F0 0.1 mi x 20 yd | 0 | 0 | – |
| 1975-07-30 | Sublette County | F1 0.1 mi x 33 yd | 0 | 0 | $30 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 Sublette County?
The most recent record with damage, injuries or deaths is the June 20, 2026 thunderstorm wind ($5,000 in damage in 2025 dollars).
| Date | Record | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2026-06-27 | Thunderstorm WindDaniel, Sublette County | 67 kt wind | 0 | 0 | – |
| 2026-06-27 | Thunderstorm WindBig Piney Airport, Sublette County | 50 kt wind | 0 | 0 | – |
| 2026-06-20 | Thunderstorm WindBig Piney, Sublette County | 61 kt wind | 0 | 0 | $5K |
| 2026-06-20 | Thunderstorm WindHalfway, Sublette County | 57 kt wind | 0 | 0 | $8K |
| 2026-06-20 | Thunderstorm WindPinedale, Sublette County | 59 kt wind | 0 | 0 | – |
| 2026-06-20 | TornadoMarbleton, Sublette County | EF0 0.62 mi x 30 yd | 0 | 0 | – |
| 2026-06-10 | High WindSublette County · forecast zone Upper Green River Basin Foothills | 54 kt wind | 0 | 0 | – |
| 2026-06-10 | High WindFremont County and 3 more · forecast zone Upper Green River Basin | 58 kt wind | 0 | 0 | – |
| 2026-06-09 | High WindFremont County and Sublette County · forecast zone Wind River Mountains East | 79 kt wind | 0 | 0 | – |
| 2026-05-25 | Thunderstorm WindBig Piney, Sublette County | 59 kt wind | 0 | 0 | – |
| 2026-05-17 | Winter StormFremont County and Sublette County · forecast zone Wind River Mountains East | 0 | 0 | – | |
| 2026-05-13 | Thunderstorm WindHalfway, Sublette County | 54 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 |
|---|---|---|---|---|---|
| 2009-02-27 | AvalancheSublette County and Teton County · forecast zone Teton & Gros Ventre Mountains A group of four snowmobilers triggered a mile long, 100 yard wide avalanche in the Deadhorse Creek drainage near Alpine in Lincoln County. The group rode into a draw after dropping off a ridge line and the slab broke loose taking the lives of three men as they tried to outrun the slide. The lone survivor was able to ... | 3 | 0 | – | |
| 2008-01-12 | AvalancheLincoln County and Sublette County · forecast zone Salt River & Wyoming Ranges Three men were killed near Cottonwood Lake when an avalanche enveloped them and their snowmobiles. The slide was estimated to have been one-half mile long, 400 yards wide at the bottom, and covered about 10 acres at an average depth of 10 feet in the runout zone. The snow was powerful enough to uproot or snap trees ... | 3 | 0 | – | |
| 2015-05-17 | AvalancheSublette County and Teton County · forecast zone Teton & Gros Ventre Mountains Four skiers were climbing the Sickle Couloir on Mount Moran in Grand Teton National Park on Sunday morning, May 17, when a shallow, wet avalanche broke from above. Three of the four skiers were swept 500 feet downhill over rock and ice. One man was killed on the mountain and another succumbed to his injuries three ... | 2 | 1 | – | |
| 2016-01-24 | AvalancheSublette County and Teton County · forecast zone Teton & Gros Ventre Mountains Two skiers were killed by an avalanche on Ralph's Slide. | 2 | 0 | – | |
| 2012-03-07 | AvalancheSublette County and Teton County · forecast zone Teton & Gros Ventre Mountains An avalanche on Ranger Peak killed two backcountry skiers Wednesday, March 7. The skiers were found the following day after a family member reported one of them missing. The avalanche occurred at 10,500 feet and swept the skiers 3,000 vertical feet down Waterfalls Canyon. Searchers found one skier 150 feet from the ... | 2 | 0 | – | |
| 2011-04-16 | AvalancheSublette County and Teton County · forecast zone Teton & Gros Ventre Mountains Two backcountry skiers were buried by a large avalanche shed from the north face of Nez Perce Peak the night of Saturday, April 16 as the skiers were sheltering in their tents for the night. Late Saturday, April 23, rescuers from the National Park Service and Teton County Search and Rescue discovered the bodies of the ... | 2 | 0 | – | |
| 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 | – | |
| 2022-03-17 | AvalancheSublette County and Teton County · forecast zone Teton & Gros Ventre Mountains Please see episode for a description. | 1 | 1 | – |
| Date | Record | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2018-09-18 | WildfireSublette County · forecast zone Upper Green River Basin Foothills | 0 | 1 | $12M | |
| 1999-03-16 | High WindSublette County and Teton County · forecast zone Lander Foothills | 0 | 0 | $886K | |
| 1998-07-02 | Thunderstorm WindBig Piney, Sublette County | 0 | 0 | $724K | |
| 2019-04-26 | TornadoMarbleton, Sublette County | EF0 0.1 mi x 20 yd | 0 | 0 | $23K |
| 2008-12-29 | AvalancheSublette County and Teton County · forecast zone Teton & Gros Ventre Mountains | 0 | 5 | $21K | |
| 2026-06-20 | Thunderstorm WindHalfway, Sublette County | 57 kt wind | 0 | 0 | $8K |
| 2026-06-20 | Thunderstorm WindBig Piney, Sublette County | 61 kt wind | 0 | 0 | $5K |
| 2016-09-04 | TornadoWarren Bridge, Sublette County | EF1 2.42 mi x 300 yd | 0 | 0 | $1K |
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 $30, in the dollars of the day) holds: July 30, 1975 (tornado, Sublette 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 Sublette 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 | – | – | – | – | 51 | 150 | 231 | 166 |
| High wind and dust storms | – | – | – | – | 16 | 5 | 12 | 41 z |
| Landslides and avalanches | – | – | – | – | 0 | 14 | 40 | 11 |
| Severe thunderstorm wind | 0 | 0 | 0 | 2 | 7 | 7 | 9 | 32 |
| Extreme cold | – | – | – | – | 8 | 2 | 8 | 15 |
| Wildfires | – | – | – | – | 0 | 4 | 15 | 8 |
High wind and dust storms in the 2020-26: 41 records against 12 in the decade before, 41 of them forecast-zone records. Cells marked z rose mostly through zone records. The local National Weather Service office files these once per forecast zone, so a change in how it draws its zones or splits a storm into records moves this count as much as the weather does; read it beside the Sublette County days with a record above.
Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).
What time of year?
42% of its winter storm records since 1996 fell in January and February. The two busiest months are in violet.
The values, month by month
Jan 160 · Feb 163 · Mar 108 · Apr 45 · May 33 · Jun 32 · Jul 37 · Aug 31 · Sep 32 · Oct 43 · Nov 67 · Dec 165 (records).
Source: NOAA NCEI Storm Events Database, records by the month they began.
Federal disaster declarations for Sublette County
FEMA's register lists 4 declarations that include Sublette County: one major disaster, 2 emergencies and one fire management assistance declaration. Most were for biological (2) and fire (1).
| Declared | Number | Type | Title |
|---|---|---|---|
| 2020-04-11 | DR-4535 | Biological | Covid-19 Pandemic |
| 2020-03-13 | EM-3479 | Biological | Covid-19 |
| 2018-09-18 | FM-5276 | Fire | Roosevelt Fire |
| 1977-06-15 | EM-3043 | Drought | Drought |
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 Sublette County had?
NOAA's Storm Events Database holds 11 flood or flash flood records for Sublette County from 1999 to 2018, on 8 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Sublette County ranks 2477th of 2,942 U.S. counties.
The National Flood Insurance Program has paid $0 on 7 claims filed in Sublette County; the most in one year was 7 in 1997. Claims count insured losses only: uninsured flood damage is not in this file.
The values, year by year
1997: 7; 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 Sublette County
FEMA's National Risk Index rates Sublette County Very Low overall, with an expected annual loss of $8.1 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 |
|---|---|---|---|
| Avalanche | Relatively High | $1.9M | 1.1 a year (modeled) |
| Landslide | Relatively Moderate | $105K | 4.5 a year (modeled) |
| Lightning | Relatively Moderate | $738K | 39 a year (modeled) |
| Wildfire | Relatively Low | $1.1M | once in about 645 years (modeled) |
| Earthquake | Relatively Low | $1.3M | once in about 87 years (modeled) |
| Riverine Flooding | Very Low | $2.7M | once in about 4 years (modeled) |
| Drought | Very Low | $5K | 73 modeled event-days a year |
| Cold Wave | Very Low | $231K | once in about 2 years (modeled) |
Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.
Counties that share a border with Sublette 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 Sublette CountyThe hazard risk calculator: 18 hazards beside the county's record
- Download Sublette County's FEMA declarations (CSV)4 rows: every declaration that named the county, for your own analysis