Summit County

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.

Mapped landslides

Mapped by UT GRC (1,167), USGS Conterminous (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. 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…

2. Jun 6, 2010Flood$5.0 million
   National Weather Service narrative

   Flooding was reported along the Weber River from Oakley to Hoytsville. The gauge on the Weber River near Oakley exceeded the flood stage of 4.5 feet on June 6th, with flooding continuing into June 10th. The gauge reached a peak of 3179 cfs on the evening of June 8th. ||Damage was reported in the communities of Oakley and Peoa, with water going over the top of some bridges and ending up in homes. Many homes and summer cabins were damaged, especially in basements and yards. Much of the damage occurred to structures at the mouth of the upper Weber River, and in homes along State Route 21 in Oakley. Residents used sandbags in several areas to try to control some of the flooding. Flood…

3. 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.

4. 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.

5. Feb 16, 2026Winter Storm, Wasatch Mountains I-80 North$500,000
   National Weather Service narrative

   A powerful winter storm brought heavy snow and strong winds to the area. Reported snow observations include 27 inches of snow in the Logan Mountains (3.1 inches water), 23 inches of snow at Powder Mountain (2.5 inches water), and 18 inches of snow at Snowbasin - Base (1.9 inches of water). Additionally, several SNOTEL stations including Lightning Ridge, Ben Lomond Peak, and Monte Cristo recorded from 1.6 to 2.7 inches of snow water equivalent, resulting in approximately 21 to 37 inches of snow. Some peak wind gust observations through the event include 97 mph at Snowbasin - Straw Top, 78 mph at Snowbasin - Strawberry Tower 15, and 76 mph at Ogden Peak. Inclement conditions also…

6. 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.

7. 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…

8. Jul 24, 1998Heavy Rain$100,000
   National Weather Service narrative

   More flooding occurred just south of Spring City as monsoon thunderstorm rains continued in Utah. Both Canal Canyon Creek and Oak Creek experienced flash flooding. Several families had to be evacuated and their homes were flooded. Extensive basement flooding also occurred in the Jeremy Ranch area as over 1.5" of rain fell in an hours time. Several mudslides also were reported in the canyons of Utah county.

9. Dec 16, 1996High Wind, Wasatch Mountains South Of I80$100,000
   National Weather Service narrative

   A strong arctic front blew through the state on this date. High winds from the northeast developed as this front moved through. Wind gusts from 70-110 mph were recorded from all the remote observing platforms in the mountains. The highest wind gust measured was 111 mph on Baldy mountain at the Alta ski resort. At a skiing event at the Deer Valley ski resort, a 12 foot metal judges' stand was blown over. 6 of the judges were injured in the incident. Most of the state's ski lifts had to be closed. These winds also surfaced in some valleys in eastern Utah as well. Wind gusts estimated to be as high as 80 mph caused considerable damage in places. In Emery windows were blown out af a…

10. Jul 3, 2012Wildfire, Wasatch Mountains South Of I-80$100,000
    National Weather Service narrative

    The Quail Fire began in the foothills above Alpine, Utah on July 3rd, and was likely caused by a construction crew operating a back hoe. The fire burned 2,222 acres before it was 100% contained on July 10th. Multiple subdivisions in the Alpine area, comprised of more than 500 homes, were evacuated due to the fire. The fire destroyed one large barn and damaged five residences. In addition to these property damages, fire suppression costs totaled $1.5 million. This fire is not to be confused with another Quail Fire that occurred in June near Leeds, Utah.

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

101°FJul 13, 2002

All-time low

−31°FDec 21, 1990

Warmest night

78°FJul 23, 1962

Coldest day

−6°FDec 21, 1990

Wettest day

3.12 inFeb 6, 1966

Snowiest day

18.0 inJan 10, 1993

Hottest year

2025mean 47.6°F

Coldest year

1951mean 41.4°F

Wettest year

198324.88 in

Driest year

19796.70 in

Snowiest season

184.4 in1992-93

Station Kamas (USC00424467), 6,481 ft elevation, 11.4 miles from the population centre. Daily records from 1949 to September 30, 2026; 93.2% 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 USC00424467.
• 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.
• 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.