Fremont County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Fremont County: 0.
2. Weak tornadoes were under-recorded before Doppler radar coverage became national in the early 1990s, so earlier decades read low. Ratings use the Fujita scale before February 2007 and the Enhanced Fujita scale after.

Storm Prediction Center severe weather database, 1950 to 2025.

Every large fire

1. Large fires mapped by the Monitoring Trends in Burn Severity program since 1984: 1,000 acres or more in the West, 500 or more in the East. Prescribed burns are excluded. Acres here are the part of each perimeter inside this place.

Monitoring Trends in Burn Severity (USGS and U.S. Forest Service), 1984 to 2026.

Smoke overhead

1. A smoke day is a date on which a smoke plume traced by NOAA Hazard Mapping System analysts from satellite imagery covered this place's point (the county's population centre or the city centre). Counts here are of medium or heavy smoke. Since 2018 analysts have often drawn light smoke as one area over most of the continent, so light-smoke counts are not comparable from year to year. The plumes show smoke anywhere in the air above, not air quality at the ground, and smoke hidden by cloud is missed.

NOAA Hazard Mapping System smoke analysis, 2011 to 2026, retrieved October 30, 2026.

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).

OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026. NOAA Storm Events through 2026.

River crests

River gauges

1. Crests are the highest and the recent crests the National Weather Service lists for each river gauge in the county that has a flood stage, not every flood. Flood categories use each gauge's current flood stages; crests from before levees, dams or channel changes may not be comparable. Crests measured on an old datum are left out of the rankings.

NOAA National Water Prediction Service gauge records, retrieved October 30, 2026.

1. The Palmer Drought Severity Index is computed by NOAA each month from the county's average temperature and precipitation, relative to the county's own climate. Zero is normal; -3 or lower is severe drought and -4 or lower extreme drought. It describes the long-term balance of moisture, not water supply or crop losses.

NOAA NCEI nClimDiv county Palmer Drought Severity Index, 1895 to September 2026, issued October 6, 2026.

Every earthquake of magnitude 4 or more within 50 miles

1. Earthquakes of magnitude 2.5 or more in the USGS Comprehensive Catalog since 1900. Within 50 miles means the epicentre lies within 50 miles of the county boundary (or inside the county).
2. Small earthquakes were under-recorded before the modern seismic networks of the 1970s and are still missed in remote areas, so early decades read low. Magnitudes are as the catalogue reports them and mix scales (moment, local and body-wave).

USGS ANSS Comprehensive Earthquake Catalog, 1900 to present, retrieved October 30, 2026.

Volcanoes within 100 miles

1. U.S. volcanoes within 100 miles, from the USGS Volcano Hazards Program. The threat category is the USGS 2018 National Volcanic Threat Assessment, which ranks volcanoes by how hazardous their past eruptions were and how many people and how much infrastructure lie near them. It is not a forecast of eruption.

USGS Volcano Hazards Program, retrieved October 30, 2026.

Mapped landslides

Mapped by ID GS (9).

1. Landslides mapped in the USGS compilation of landslide inventories across the United States (version 3.0, 2025), rated probable or better. The compilation joins inventories made by federal and state agencies for different purposes and areas, so the number mapped in a county reflects how closely it has been surveyed as much as how often its slopes fail. An area with few records may simply not have been mapped. Deaths are as recorded in the inventories; a slide listed in two inventories is counted once.

USGS Landslide Inventories across the United States, version 3.0, retrieved October 27, 2026.

More event types since 1996

Costliest events since 1996

1. Apr 23, 2002High Wind, Upper Snake River Plain$3.0 million
   National Weather Service narrative

   One week after a heavy snowstorm, the same area in southeastern Idaho was hit by a windstorm. The passage of a strong cold front created the winds on April 23rd. Sustained winds on the 23rd were between 40 and 50 mph with gusts reaching 60 to 70 mph throughout the afternoon covering the entire Snake River Plain from Minidoka northeast through Pocatello, Craters of the Moon, Blackfoot, Idaho Falls to Rexburg. The winds also did damage in the Upper Snake Highlands as well. 10,000 residents lost power in Blackfoot, Pocatello, and Chubbuck. The winds created poor visibility and blowing dust and closed roads. Interstate 15 was closed from Idaho Falls to Roberts. US Highway 20 was…

2. Oct 15, 1998Winter Storm, Yellowstone National Park Mt Id / W Park / N Teton$1.0 million
   National Weather Service narrative

   A severe winter storm moved across Western and Central Wyoming dumping locally heavy snow from southern Yellowstone National Park to the Casper area. The main brunt of the storm was felt in the Casper area where up to 17 inches of snow fell. Strong winds accompanied the heavy snow causing widespread tree damage and power outages. Poor visibilities and icy road conditions caused numerous vehicle accidents.

3. Oct 14, 2017Heavy Snow, Upper Snake River Plain$625,000
   National Weather Service narrative

   An early season snowfall of wet heavy snow dropped widespread reports of 6 to 8 inches of snow in Idaho Falls. Power lines, trees and tree limbs were downed due to the heavy and wet nature of the snow. Over 15,400 customers were reported without power by Idaho Falls Power by 9 am on the 14th. Several auto accidents reported. Three trees fell on cars and one tree fell on a mobile home with another through a residential window.

4. Jul 18, 2004Debris Flow, Yellowstone National Park$275,000
   National Weather Service narrative

   A thunderstorm produced very heavy rain late in the evening over Sylvan Pass. A slide of mud and earth oozed onto U.S. Highway 16 about 6 miles west of Yellowstone National Park's east entrance. Four feet of mud and debris trapped sixteen people in four vehicles for three hours. The debris flow was estimated to contain 30,000 tons of mud and rock and was in some cases 10 feet deep. The east entrance of Yellowstone National Park was closed for four days following the mudslide. No injuries occurred.

5. Apr 2, 2018High Wind, Upper Snake River Plain$275,000
   National Weather Service narrative

   A powerful cold front moved through Idaho and caused significant damage. Wind gusts of 50 to 70 mph were common throughout the day on the 2nd especially in the afternoon. Interstate 15 was closed from exit 118 to exit 143 from Idaho Falls to Roberts due to blowing dust caused from the winds. A boat was blown off a trailer near Ririe on US Highway 26. Several trees were reported downed in Idaho Falls including one that fell on top of Holy Rosary Elementary School. Some structural damage was reported in Idaho Falls due to trees falling on homes. Damage to power lines resulted in over 2,500 customers without power reported by Rocky Mountain Power. Power poles were downed in Terreton…

6. Jan 1, 2004Blizzard, Upper Snake River Plain$220,000
   National Weather Service narrative

   An incredible storm concluded a very active holiday weather week in southeast Idaho with widespread snow and wind beginning Christmas and continuing almost without interruption through New Year's Day. The Pocatello airport received 23.4 inches of total snowfall during the week. The final storm during January 1st was the highlight of the week with a widespread blizzard affecting all of southeastern Idaho from the central mountains extending east and south to the Utah and Wyoming borders. An intense pacific storm system caused the event with a strong surface low pressure moving rapidly through the Idaho panhandle late in the day. The blizzard came in two waves with very strong…

7. Nov 1, 2022High Wind, Upper Snake River Plain$190,000
   National Weather Service narrative

   Twenty-seven power poles were knocked down with Rocky Mountain Power reporting 1,500 customers without power very early on November 2nd with the Idaho Falls airport reporting a 74 mph wind gust at 1:30 AM MDT. Much of the damage was in the Idaho Falls and Shelley area as well as the power outages. Most gusts were in the 45 to 55 mph range with a couple exceeding 60 mph.

8. Jan 18, 2011Heavy Snow, Upper Snake River Plain$140,000
   National Weather Service narrative

   A flat-roofed cinder block commercial building roof collapsed. The building in Rexburg housed both Rocky Mountain ATVs and Custom Auto. Heavy snow collected on the roof was the cause of the collapse.

9. Feb 5, 2017Flood$131,000
   National Weather Service narrative

   A February warmup caused mainly road damage to Fremont County with some minor flooding.

10. Mar 1, 2024Winter Storm, Upper Snake River Plain$118,000
    National Weather Service narrative

    A strong Pacific storm system brought heavy snow, strong winds which caused excessive damage due to the heavy and wet nature of the snow. Several trees were downed with extensive power outages. Windy conditions and colder temperatures caused some road closures on the 4th. 15 thousand customers from Rigby to Rexburg to Idaho Falls to Lewisville were without power on the 2nd. 10 to 16 inches of snow fell with 12 inches in Idaho Falls with 15 inches near the Idaho Falls Airport and 10 inches in Rexburg. The Rigby COOP reported 9 inches. Extensive reports of downed power lines. A power pole snapped in Idaho Falls. Dozens of trees downed in Idaho Falls. A large carport collapsed on top…

1. Storm Events records before 1996 cover only tornadoes, thunderstorm wind and hail. Damage figures are as reported by the National Weather Service at the time, not adjusted for inflation.

NOAA NCEI Storm Events Database, 1950 to 2026, issued October 26, 2026.

All-time high

100°FJun 26, 1988

All-time low

−40°F2 times, most recently Dec 30, 1990

Warmest night

68°F2 times, most recently Jul 22, 2018

Coldest day

−12°FDec 23, 1990

Wettest day

2.00 inMar 28, 1998

Snowiest day

15.0 inDec 25, 2016

Hottest year

1953mean 44.7°F

Coldest year

1993mean 38.3°F

Wettest year

199522.80 in

Driest year

19767.30 in

Snowiest season

102.7 in2007-08

Station Saint Anthony (USC00108022), 4,970 ft elevation, 5.2 miles from the population centre. Daily records from 1895 to August 31, 2026; 91.7% of days in the last 30 years are complete. Records at a single station can differ from a city’s official threaded record, which may combine several stations.

NOAA NCEI Global Historical Climatology Network Daily.

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).

OpenFEMA Disaster Declarations Summaries, retrieved October 30, 2026. Statewide declarations are not listed.

Neighbouring counties

• Tornadoes NOAA Storm Prediction Center severe weather database, through 2025.
• Tropical cyclones NOAA National Hurricane Center HURDAT2 (Atlantic; Northeast and Central Pacific), through 2025.
• Wildfire USGS/USFS Monitoring Trends in Burn Severity, through 2026.
• Storm events NOAA NCEI Storm Events Database, through 2026.
• Flood insurance OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026.
• Declarations OpenFEMA Disaster Declarations Summaries v2, retrieved October 30, 2026.
• Weather records NOAA NCEI Global Historical Climatology Network Daily, station USC00108022.
• River crests NOAA National Weather Service, National Water Prediction Service river gauges, retrieved October 30, 2026.
• Drought NOAA NCEI nClimDiv county Palmer Drought Severity Index, through September 2026.
• Smoke NOAA NESDIS Hazard Mapping System smoke analysis, retrieved October 30, 2026.
• Volcanoes USGS Volcano Hazards Program, U.S. volcanoes and 2018 threat assessment.
• Landslides USGS Landslide Inventories across the United States, version 3.0 (2025).
• Earthquakes USGS ANSS Comprehensive Earthquake Catalog (ComCat), retrieved October 30, 2026.

Joins, thresholds and known limits are set out in the methodology. Found an error? Report it. Page built October 30, 2026.