Wasatch County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Wasatch 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.

Claims by ZIP code

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 UT GRC (1,195), USGS Conterminous (5), NASA (2).

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. Aug 1, 2018Wildfire, Wasatch Plateau/Book Cliffs$25.0 million
   National Weather Service narrative

   The Dollar Ridge Fire was a human caused wildfire that began during the afternoon of July 1. The fire burned 68,869 acres and destroyed 363 structures, including 74 homes. Costs to fight the fire were approximately $18 million, though rehabilitation efforts were projected to add significantly to the cost. At the height of the fire, approximately 1,100 people were evacuated from communities in Wasatch and Duchesne Counties. The fire was considered effectively contained on August 31, at 94% containment. Note that this event began in July.

2. Jul 1, 2018Wildfire, Wasatch Plateau/Book Cliffs$25.0 million
   National Weather Service narrative

   The Dollar Ridge Fire was a human caused wildfire that began during the afternoon of July 1. The fire burned 68,869 acres and destroyed 363 structures, including 74 homes. Costs to fight the fire were approximately $18 million. At the height of the fire, approximately 1,100 people were evacuated from communities in Wasatch and Duchesne Counties. Note that this event continued into August.

3. Jul 1, 2012Wildfire, Wasatch Mountains South Of I-80$9.0 million
   National Weather Service narrative

   The Wood Hollow Fire began on June 23rd near Fountain Green, Utah in Sanpete County. The fire was ignited when gusty winds caused a power line to come too close to the top of another power pole, sparking a grass fire at its base. The electrical ground wires had been removed by copper thieves, which eliminated the system's ability to properly dissipate the electrical current. This fire caused one fatality, a 60-year-old male whose body was found inside a burned car. Two firefighters also sustained minor injuries. In total, the Wood Hollow Fire burned 47,387 acres, and caused extensive property damage. The communities of Indian Ridge, Elk Ridge, Big Hollow, and Oaker Hills all…

4. Apr 1, 2023Heavy Snow, Wasatch Back$1.0 million
   National Weather Service narrative

   A snowfall accumulation of 15.3 inches with 0.83 inches of snow water equivalent was observed at Wanship. Other snowfall observations include 12.8 inches with 0.76 inches of snow water equivalent at Oakley and 12.5 inches with 0.92 inches of snow water equivalent at Eden-Liberty. Three structural collapses occurred on April 3 in Park City. The first involved a garage, the second was a chimney, and the third was related to the home.

5. Feb 6, 2024Heavy Snow, Wasatch Mountains South Of I-80$1.0 million
   National Weather Service narrative

   A snowfall accumulation of 52 inches was measured at the Alta - Collins site. Other snowfall accumulations include 45 inches at the Brighton-Crest site, 39 inches at Park City Mountain, and 34 inches at Snowbird.||Little Cottonwood Canyon was closed for portions of time on February 7 for avalanche mitigation. ||Over 75 crashes were reported through the event.

6. Jul 1, 2012Wildfire, Wasatch Plateau/Book Cliffs$900,000
   National Weather Service narrative

   The Church Camp Fire began on June 24th, approximately 22 miles south of Duchesne, Utah. The cause of the fire is unknown, but it was believed to be human-caused. The fire caused the evacuation of Argyle Canyon, a popular summer cabin and recreation area. A total of 7,211 acres were burned before the fire was 100% contained on July 7th. Three injuries to firefighters were reported, with one back injury and two heat-related injuries. The fire destroyed 15 cabins and 78 other non-residential buildings. In addition to the property damage, fire suppression costs totaled $12.2 million. Note that this event began in June, and monetary property damage listed here is for the entire event.

7. Jan 25, 1997Winter Storm, Wasatch Mountains South Of I80$300,000
   National Weather Service narrative

   A strong winter storm hit Utah during this time. Winds of 50-70 mph were common in the mountains. Hidden peak at the Snowbird ski resort measured a wind gust of 100 mph. Heavy snowfall generally left the mountains with 1-2 feet. 2-5 inches were common in the northern valleys. The Sundance ski resort measured the most snowfall from this storm with 42 inches. Several avalanches occurred during this storm. One in Provo canyon claimed the life of a 27 year old male ice climber. Two vacation houses were damaged in other avalanches. Numerous traffic accidents occurred with at least 20 know injuries.

8. Feb 16, 2026Winter Storm, Wasatch Mountains South Of I-80$200,000
   National Weather Service narrative

   A powerful winter storm brought heavy snow and strong winds to the area. Reported snow observations include 47 inches of snow at Alta - Collins (4.7 inches water), 36 inches of snow at Brighton Crest (3.7 inches water), 32 inches of snow at Solitude (3.3 inches water), and 28 inches of snow at Park City Mountain (2.7 inches of water). Additionally, SNOTEL stations including Thaynes Canyon and Mill-D North recorded from 2.2 to 2.4 inches of snow water equivalent, resulting in approximately 31 to 34 inches of snow. Some peak wind gust observations through the event include 103 mph at Arrowhead Summit, 96 mph at Hidden Peak, and 84 mph at Alta - Mt Baldy. A prolonged period of…

9. Mar 20, 2000High Wind, Wasatch Plateau/Book Cliffs$200,000
   National Weather Service narrative

   Strong downslope winds developed overnight across Weber County. Wind gusts estimated at 115mph (100kts) tore the roofs off of 3 condominiums in South Ogden. Major damage was also caused to the interiors of these condos, along with some toppled garage doors, a toppled brick wall, and a damaged fence nearby. Miraculously, nobody was seriously injured. Damage estimates to the area was just over 1 million dollars. These same downslope winds also caused an estimated 70 thousand dollars damage to the roof of Wasatch Hall on the campus of Weber State University, and several thousand dollars in damage due to scattered losses of fences, shingles and trees in the Ogden area. These same…

10. Oct 29, 2024Winter Weather, Wasatch Plateau/Book Cliffs$150,000
    National Weather Service narrative

    A pickup truck collided head-on with a semitrailer after the driver of the pickup truck lost control on state Route 96. Archived liquid precipitation measurements suggest around 0.2-0.5 had fallen in the area by that point, with National Operational Hydrologic Remote Sensing Center data indicating a snow depth of 2-4 inches at the time of the crash.

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°F4 times, most recently Jul 14, 2002

All-time low

−39°FFeb 7, 1989

Warmest night

71°FAug 25, 1953

Coldest day

−10°FDec 22, 1990

Wettest day

5.08 inFeb 1, 1963

Snowiest day

28.0 inFeb 15, 1944

Hottest year

2025mean 48.2°F

Coldest year

1984mean 41.2°F

Wettest year

198235.95 in

Driest year

20209.39 in

Snowiest season

230.6 in1951-52

Station Deer Creek Dam (USC00422057), 5,270 ft elevation, 9.6 miles from the population centre. Daily records from 1939 to October 21, 2026; 97.4% 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 USC00422057.
• 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.