Live
Active alerts for this county
Red Flag Warning
North Bighorn Basin/Worland BLM; Cody Foothills; Lincoln and Uinta Counties/Lower Elevations; Upper Green River Basin/Rock Springs BLM; Sweetwater County/Rock Springs BLM/Flaming Gorge NRA; Natrona County/Casper BLM; Johnson County/Casper BLM; South Bighorn Basin/Worland BLM; Upper Wind River Basin/Wind River Basin; South Bighorn Mountains; Absaroka Mountains/North Shoshone NF; Owl Creek Mountains; East Wind River Mountains/South Shoshone NF; Granite/Green/Ferris/Rattlesnake Mountains; Casper Mountain
Fremont County, Wyoming severe weather history spans 452 recorded events between 1958 and 2026. The dominant hazard is thunderstorm wind, accounting for 45.8% of all recorded events. It ranks #1,056 nationally and #7 in Wyoming.
452
Recorded events
2
Direct deaths
5
Direct injuries
$20.9M
Property damage
The record
What the Fremont County, Wyoming severe weather history record shows
Across the archive, Fremont County, Wyoming severe weather history averages 6.6 recorded events a year. The busiest stretch on record is the 2010s, with 144 events logged in that decade alone. Roughly 62 events fall before 1990 and 390 from 1990 onward — a gap that reflects the expansion of NOAA reporting practice as much as the weather itself.
The deadliest hazard in the Fremont County, Wyoming record is thunderstorm wind, responsible for 1 direct deaths. The costliest is flood, with $15.9M in reported property damage. In total, 9 distinct hazard types appear in this county archive, each listed with its own dated record below.
By hazard type
Every hazard type recorded in Fremont County
| Hazard | Events | Deaths | Damage | Max | Span |
|---|---|---|---|---|---|
| Thunderstorm Wind | 207 | 1 | $182K | 83 | 1964–2026 |
| Hail | 136 | 0 | $3.0M | 2 | 1958–2025 |
| Flood | 44 | 1 | $15.9M | 0 | 1998–2023 |
| Tornado | 22 | 0 | $628K | F3 | 1962–2020 |
| Flash Flood | 22 | 0 | $870K | 0 | 1997–2025 |
| Funnel Cloud | 10 | 0 | $0 | 0 | 1997–2015 |
| Wildfire | 6 | 0 | $70K | 0 | 1999–2002 |
| Lightning | 4 | 0 | $240K | 0 | 2009–2012 |
| Heavy Rain | 1 | 0 | $0 | 0 | 1999–1999 |
Decade by decade
Fremont County, Wyoming severe weather history by decade
Reporting practice changed over time — early decades are undercounted, not calmer.
Tornado tracks
Paths crossing this county
22 mapped tornado paths intersect this county: 22 touched down inside it and 0 crossed in from a neighbouring county. This comes from path geometry, not county-tagged reports.
| Date | Scale | Deaths | Injuries | Path length | Origin |
|---|---|---|---|---|---|
| 1962-06-16 | EF3 | 0 | 0 | 0.5 mi | Touched down here |
| 1986-06-07 | EF2 | 0 | 0 | 2.0 mi | Touched down here |
| 1973-08-27 | EF2 | 0 | 0 | 0.5 mi | Touched down here |
| 1967-06-06 | EF2 | 0 | 2 | 8.2 mi | Touched down here |
| 2014-05-06 | EF1 | 0 | 0 | 1.5 mi | Touched down here |
| 1997-06-06 | EF1 | 0 | 0 | 2.0 mi | Touched down here |
| 1980-08-03 | EF1 | 0 | 0 | 0.1 mi | Touched down here |
| 1977-06-20 | EF1 | 0 | 0 | 2.0 mi | Touched down here |
| 1976-08-03 | EF1 | 0 | 0 | 0.1 mi | Touched down here |
| 1968-06-05 | EF1 | 0 | 0 | 0.1 mi | Touched down here |
Significant events
Deadliest events on record in Fremont County
| Date | Type | Location | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Jul 3, 2023 | Thunderstorm Wind | (LND)HUNT FLD LANDER | 1 | 0 | $0 |
| Feb 21, 2017 | Flood | RIVERTON | 1 | 0 | $10K |
| Jun 6, 1967 | Tornado | 0 | 2 | $250 | |
| Jun 4, 2012 | Lightning | MILFORD | 0 | 1 | $0 |
| May 28, 2008 | Tornado | DUBOIS | 0 | 1 | $10K |
| Jun 14, 1967 | Tornado | 0 | 1 | $25K |
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
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.
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 in Riverton with the strong wind. On Ocean Lake near Riverton WY, a kayak was capsized and two men were thrown into the water. One was rescued by a nearby boater, but the other could not be found and was presumed dead by the Fremont County Sheriff (Sheriff Office press release from July 5, 2023).
There were numerous reports of quarter to golf ball size hail in around around Riverton, with the largest hail stones reported on the east side of Riverton. Many vehicles sustained windshield and body damage from the hail. Dozens of homes on the east side of Riverton had roof shingle damage, with roof replacements occurring regularly over the next 4 months.
Context
Risk, population and federal disasters
Relatively Low
FEMA NRI risk rating
39,533
Population (ACS)
$269K
Median home value
6
Federal declarations
| Declared | Incident | Title | Type |
|---|---|---|---|
| Apr 11, 2020 | Biological | COVID-19 PANDEMIC | DR |
| Mar 13, 2020 | Biological | COVID-19 | EM |
| Aug 5, 2017 | Flood | FLOODING | DR |
| Jul 25, 2016 | Fire | LAVA MOUNTAIN FIRE | FM |
| Jul 22, 2011 | Severe Storm | SEVERE STORMS, FLOODING, AND LANDSLIDES | DR |
| Jul 14, 2010 | Flood | FLOODING | DR |
Within the county
Most affected places
- Riverton 126
Quick answers
Frequently asked
How many severe weather events have been recorded in Fremont County, Wyoming?
452 events are on record between 1958 and 2026, causing 2 direct deaths and $20.9M in property damage.
What is the most common severe weather hazard in Fremont County?
Thunderstorm Wind, with 207 recorded events — 45.8% of everything in the archive for this county.
How many tornadoes have crossed Fremont County?
22 mapped tornado paths intersect the county boundary; 22 of them touched down inside it. This is derived from path geometry, not county-tagged reports.
How many federal disaster declarations cover Fremont County?
6 federal disaster declarations from FEMA include Fremont County, each tied to a specific incident period.
How risky is Fremont County compared with the rest of the country?
FEMA's National Risk Index rates Fremont County as relatively low risk, placing it in the 60 percentile of its state for expected annual loss.
Where does the Fremont County, Wyoming severe weather history data come from?
Every figure is drawn from United States federal public-domain records: NOAA/NCEI Storm Events for the event archive, NOAA SPC SVRGIS for mapped tornado paths, FEMA for disaster declarations and risk ratings, and the U.S. Census for population context. Dates are shown in UTC and recent entries may still be revised by NOAA.
Nearby
Neighbouring counties
- Crook County 839
- Goshen County 680
- Converse County 266
- Hot Springs County 129
- Carbon County 228
- Johnson County 290
Cite this page
“Fremont County, Wyoming.” Severe Weather History. severeweatherhistory.com/county/wyoming/fremont-county/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.