Campbell County, WY Environment & Hazard Risk
Relatively Low natural hazard risk, led by hail. 1,366 storm events since 1996.
- Expected yearly loss
- $24.99M
- Relatively Low nationally
- Storm events since 1996
- 1,366
- Most often hail
- Flood insurance policies
- 18
- 0.1% of homes
- Hurricanes nearby
- 0
- Since 1851
Natural hazard risk
FEMA National Risk Index, December 2025
Overall risk
Relatively Low
Score 56.1 of 100
Social vulnerability
Very Low
Score 10.6 of 100
Community resilience
Very Low
Score 8.2 of 100
Community resilience runs the other way: a higher rating means a community can recover faster.
Building value exposed: $10.89B · Agriculture value exposed: $90.01M · Risk-adjusted yearly loss: $19.58M
Risk by hazard
- HailRelatively High$3.63M/yr expected annual loss, about 2.2 events a year
- WildfireRelatively Moderate$2.92M/yr expected annual loss, about once every 227 years
- Winter weatherRelatively High$511K/yr expected annual loss, about 16 events a year
- Cold waveRelatively Moderate$7.77M/yr expected annual loss, about 4.8 events a year
- EarthquakeRelatively Low$1.24M/yr expected annual loss, about once every 437 years
- LandslideRelatively Low$6,579/yr expected annual loss, about 3.7 events a year
- LightningRelatively Moderate$487K/yr expected annual loss, about 38 events a year
- TornadoRelatively Low$1.46M/yr expected annual loss, about once every 1 year
- Strong windRelatively Low$408K/yr expected annual loss, about 1.1 events a year
- DroughtVery Low$2,712/yr expected annual loss, about 80 events a year
- Ice stormVery Low$13.02K/yr expected annual loss, about once every 67 years
- Heat waveVery Low$33.88K/yr expected annual loss, about once every 5 years
Bars show the national percentile score (0 to 100) for each hazard. Dollar figures are expected annual losses to buildings, people and crops. Not rated here: avalanche, coastal flooding, hurricane, riverine flooding, tsunami, volcanic activity.
Flood risk and insurance
National Flood Insurance Program and FEMA flood maps
Check the flood zone for an address
- Homes with flood insurance
- 18 of 20,810 (0.1%)
- Homes in high-risk flood zones
- 125
- Insured in high-risk zones
- 9 (7%)
- Flood claims since 1978
- 22
- Claims paid since 1978
- $38.09K
Flood claims paid per year
Storm history
Since 1996: 1,366 events, 4 deaths, $81.22M in damage
- Hail559
- Thunderstorm Wind380
- Winter Storm109
- High Wind101
- Winter Weather56
- Tornado37 · 2 deaths
- Blizzard35
- Heavy Snow18
- Cold/Wind Chill15
- Flash Flood14 · 1 death
Events per year
93 tornadoes on record (EF0 14, EF1 4, EF2 2, EF3 1, F0 40, F1 19, F2 7).
Most damaging storms
Since 1996, ranked by deaths, injuries and damage
- Hail1.75" hail05/27/2010
Gillette, Campbell County
$46M damage
What happened
A severe thunderstorm produced hail to around golf ball size in Gillette, causing extensive damage across the city. The storm moved generally from south to north through the city. The most heavily damaged areas were in the Westover Hills and Foothills subdivisions, as well as the downtown area. The hail damaged the roofs and windows of several thousand homes and buildings. Thousands of automobiles were damaged across the city, including several automobile dealerships that reported damage to nearly their entire inventory. Damage estimates were near 50 million dollars.
- TornadoF2, 1.5 mi path, 450 yd wide08/12/2005
Wright, Campbell County
2 deaths, 13 injured, $5M damage
What happened
A tornado touched down 1 mile north of Wright and traveled southeast into the town. It crossed Wyoming Highway 387, slammed into a mobile home park, and dissipated a half mile from the highway before reaching the elementary school and Wright Blvd on the southeast edge of the park. It damaged 120 of the approximately 250 homes in the park; 91 were completely destroyed. Roofs, porches, siding, and trees sustained light damage from the strong wind gusts. Two people were killed and 13 injured; all were in mobile homes.
- Hail2.75" hail06/21/2003
Gillette, Campbell County
$17M damage
What happened
A strong upper-level shortwave moving over northeastern Wyoming produced a long lived supercell thunderstorm. The thunderstorm developed over western Campbell County and moved east across Gillette and continued to Rozet. The storm continued into southern Crook County, moving just north of Moorcroft and Sundance. West of Gillette, the storm became tornadic and produced brief tornadoes. One tornado briefly touched down 12 miles west of Gillette in the vicinity of Force Road, north of Interstate 90, with no damage. Another tornado briefly touched down near the Wyodak Power Plant, about 5 miles east of Gillette, also with no damage. Golf ball to baseball sized hail was common across Campbell and Crook Counties. Extensive hail damage was reported in Gillette, particularly across northern parts of the city. Auto dealerships estimated losses of several million dollars. Insurance companies estimated claims totals from automobile and roof damage to be in the millions of dollars.
- Flash Flood07/23/2008
Recluse, Campbell County
1 death, 3 injured
What happened
Water rushing down a canyon washed out a culvert and a small section of Trail Creek Road east of Highway 59. A pickup truck drove into the washed out section of road, resulting in one fatality and three injuries.
- Hail1.75" hail08/02/2013
Wright, Campbell County
$10M damage
What happened
Large amounts of ping pong to golf ball size hail fell around Wright. Portions of town had hail drifts three to five feet high. The wind-driven hail caused extensive damage to homes and vehicles.
- Heavy Rain08/02/2013
Gillette, Campbell County
1 death
What happened
A man checking if a culvert was clogged after heavy rain was swept into the culvert and drowned.
Latest storm reports
Newest first
- Thunderstorm Wind51 kt wind07/31/2026
Wright, Campbell County
- Thunderstorm Wind58 kt wind07/31/2026
Wright, Campbell County
- Thunderstorm Wind58 kt wind07/31/2026
Wright, Campbell County
- Thunderstorm Wind51 kt wind07/31/2026
Wright, Campbell County
- Thunderstorm Wind53 kt wind07/29/2026
Wright, Campbell County
- Thunderstorm Wind53 kt wind07/29/2026
Gillette, Campbell County
- Thunderstorm Wind63 kt wind07/27/2026
Wright, Campbell County
- Thunderstorm Wind50 kt wind07/27/2026
(Gcc)gillette Arpt, Campbell County
Drinking water
45 community water systems serve about 48,536 people. Violations since 2021.
4 systems had health-based violations, such as a contaminant over the legal limit or a missed treatment step.
- Gillette, City ofServes 32,222 · Groundwater · Local governmentNo health violations+2 monitoring or reporting
- Wright Water & Sewer DistrictServes 3,207 · Groundwater · Local governmentNo health violations+1 monitoring or reporting
- Sleepy Hollow SubdivisionServes 2,400 · Groundwater · PrivateNo health violations
- Antelope Valley I&s District (Avisd)Serves 1,280 · Groundwater · PrivateNo health violations
- Fox Park SubdivisionServes 843 · Groundwater · Local governmentNo health violations
- Heritage Village SubdivisionServes 750 · Groundwater · PrivateNo health violations
- Foothills Mobile Home ParkServes 735 · Purchased groundwater · PrivateNo health violations
- Eastview Manufactured Home CommunityServes 688 · Purchased groundwater · PrivateNo health violations
Largest systems by population served. Monitoring and reporting violations mean required tests or notices were late or missing, not that the water was unsafe.
Climate
1991-2020 normals at Gillette 4se, 5.2 mi from the county center
Summer highs peak around 86°F in Jul and winter lows bottom out near 16°F in Jan. About 17.6 inches of rain falls in a typical year, with 55.7 inches of snow.
| Month | High | Low | Rain | Snow |
|---|---|---|---|---|
| Jan | 36°F | 16°F | 0.59 in | 8.2 in |
| Feb | 38°F | 17°F | 0.78 in | 9.0 in |
| Mar | 49°F | 25°F | 1.13 in | 8.6 in |
| Apr | 56°F | 32°F | 2.13 in | 9.4 in |
| May | 66°F | 41°F | 3.27 in | 1.3 in |
| Jun | 77°F | 50°F | 2.54 in | 0.1 in |
| Jul | 86°F | 57°F | 1.68 in | - |
| Aug | 85°F | 56°F | 1.38 in | - |
| Sep | 75°F | 46°F | 1.25 in | 0.5 in |
| Oct | 59°F | 34°F | 1.57 in | 4.4 in |
| Nov | 46°F | 24°F | 0.63 in | 5.8 in |
| Dec | 36°F | 16°F | 0.64 in | 8.4 in |
| Year | 47°F average | 17.6 in | 55.7 in | |
Pollution sites
0 Superfund sites and 8 toxic release facilities in Campbell County
Superfund sites
None in this county.
Toxic release facilities
- Black Hills Corp - Neil Simpson Complex1.7 million lbs released, Gillette
- Basin Electric Dry Fork Station1.3 million lbs released, Gillette
- Pacificorp Wyodak Plant795,765 lbs released, Gillette
- Western Gas Resources Hilight Gas Plant30,440 lbs released, Gillette
- 50 Buttes5,158 lbs released, Gillette
- Nelson Brothers Mining Services LLC70 lbs released, Gillette
- Buckskin Mining Co Gillette Wy6 lbs released, Gillette
- Joy Global Gillette Wy0 lbs released, Gillette
Total: 3.9 million lbs in 2024, 215,553 lbs to air.
Superfund sitesToxic release facilitiesEPA inspections and enforcementAir toxics cancer risk
Frequently asked questions
- How risky is Campbell County for natural disasters?
- FEMA rates Campbell County relatively low for overall natural hazard risk, with expected losses of $24.99M a year. The highest-rated hazards are hail (relatively high), wildfire (relatively moderate), winter weather (relatively high).
- What storms are most common in Campbell County?
- Since 1996, NOAA recorded 1,366 storm events affecting Campbell County, most often hail (559), thunderstorm wind (380), winter storm (109).
- How many tornadoes have hit Campbell County?
- 93 tornadoes have been recorded in Campbell County since 1950, including 1 rated F3/EF3 or stronger.
- How many homes in Campbell County have flood insurance?
- 18 residential flood insurance policies are in force in Campbell County, covering about 0.1% of homes. The program has paid $38.09K on 22 claims here since 1978.
- What is the weather like in Campbell County?
- At Gillette 4se, average highs reach 86°F in Jul and lows fall to 16°F in Jan, with 17.6 inches of rain a year (1991-2020 normals).
Source: FEMA (National Risk Index, NFIP), NOAA (Storm Events, HURDAT2, Climate Normals), EPA · Last updated 08/01/2026 · Storm counts include events in forecast zones that touch the county. This product uses the FEMA OpenFEMA API, but is not endorsed by FEMA.