Sioux County, ND Environment & Hazard Risk
Relatively Low natural hazard risk, led by cold wave. 185 storm events since 1996.
- Expected yearly loss
- $12.4M
- Very Low nationally
- Storm events since 1996
- 185
- Most often hail
- Flood insurance policies
- 3
- 0.3% of homes
- Hurricanes nearby
- 0
- Since 1851
Natural hazard risk
FEMA National Risk Index, December 2025
Overall risk
Relatively Low
Score 62.1 of 100
Social vulnerability
Very High
Score 97.3 of 100
Community resilience
Very Low
Score 2.6 of 100
Community resilience runs the other way: a higher rating means a community can recover faster.
Building value exposed: $879M · Agriculture value exposed: $79.7M · Risk-adjusted yearly loss: $23.5M
Risk by hazard
- Cold waveRelatively High$10.2M/yr expected annual loss, about 13 events a year
- Winter weatherRelatively Moderate$123K/yr expected annual loss, about 20 events a year
- WildfireRelatively Low$236K/yr expected annual loss, about once every 774 years
- HailRelatively Moderate$422K/yr expected annual loss, about 2.8 events a year
- Strong windRelatively Moderate$436K/yr expected annual loss, about 2.0 events a year
- Ice stormRelatively Low$40.9K/yr expected annual loss, about once every 1 year
- TornadoVery Low$201K/yr expected annual loss, about once every 3 years
- DroughtVery Low$5,468/yr expected annual loss, about 22 events a year
- LightningVery Low$37.2K/yr expected annual loss, about 31 events a year
- LandslideVery Low$45/yr expected annual loss, about once every 3 years
- Heat waveVery Low$23.7K/yr expected annual loss, about 1.9 events a year
- EarthquakeVery Low$3,001/yr expected annual loss, about once every 7,463 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
- 3 of 1,098 (0.3%)
- Homes in high-risk flood zones
- 4
- Insured in high-risk zones
- 0 (0%)
- Flood claims since 1978
- 2
- Claims paid since 1978
- $374
- Flooding$0 · 1 claim
Storm history
Since 1996: 185 events, 2 deaths, $7.5M in damage
- Hail101
- Thunderstorm Wind54
- Tornado11
- Flash Flood8 · 2 deaths
- Flood5
- Funnel Cloud3
- Astronomical Low Tide2
- Wildfire1
Events per year
17 tornadoes on record (EF0 3, EF1 2, F0 6, F1 2).
Most damaging storms
Since 1996, ranked by deaths, injuries and damage
- Flash Flood07/09/2019
Ft Yates, Sioux County
2 deaths, 2 injured, $750K damage
What happened
Flash flooding resulted in a section of BIA Road 3, locally known as the Kenel Road which connects with ND Highway 1806, being washed out at the crossing with Joe Bush Creek. The culvert washed out and the road collapsed. Four vehicles drove into the washout and resulted in two fatalities and two injuries.
- Hail5" hail07/14/2010
Cannon Ball, Sioux County
2 injured, $2M damage
What happened
A North Dakota state record tying hailstone of five inches in diameter fell at Prairie Knights Casino and Resort. The resort, and all vehicles outside, sustained severe damage from the extreme hail. One of these large hail stones crashed through the windshield of a car, injuring the two occupants. This tied the record size five inch diameter hailstone in Mercer County on August 3, 1969.
- Thunderstorm Wind52 kt wind08/09/2002
Selfridge, Sioux County
2 injured
What happened
In the small community of Porcupine, a trailer home was destroyed by the wind. Two occupants in the home received minor injuries.
- Thunderstorm Wind109 kt wind06/22/2023
Selfridge, Sioux County
1 injured, $250K damage
What happened
Damage survey revealed that a microburst struck this property and completely destroyed a manufactured home which rolled onto a vehicle crushing the roof and partially damaging another vehicle. Parts of the home were blown into a barn, severely damaging it. The debris pattern was divergent in nature, and orientated toward the east/southeast. Two people were in the home at the time. One was injured (direct) and hospitalized.
- Thunderstorm Wind80 kt wind07/01/2006
Cannon Ball, Sioux County
1 injured, $80K damage
What happened
One person was injured and hospitalized as three mobile homes were blown over and damage was sustained to one permanent home.
- Hail4.25" hail07/14/2010
Cannon Ball, Sioux County
$1M damage
What happened
This was the first of three waves of very large hail to impact the city of Cannon Ball during this episode. Severe damage to vehicles, homes, and crops occurred.
Pollution sites
0 Superfund sites and 0 toxic release facilities in Sioux County
No Superfund sites or toxic release facilities in Sioux County in our data.
Superfund sitesToxic release facilitiesEPA inspections and enforcementAir toxics cancer risk
Frequently asked questions
- How risky is Sioux County for natural disasters?
- FEMA rates Sioux County relatively low for overall natural hazard risk, with expected losses of $12.4M a year. The highest-rated hazards are cold wave (relatively high), winter weather (relatively moderate), wildfire (relatively low).
- What storms are most common in Sioux County?
- Since 1996, NOAA recorded 185 storm events affecting Sioux County, most often hail (101), thunderstorm wind (54), tornado (11).
- How many tornadoes have hit Sioux County?
- 17 tornadoes have been recorded in Sioux County since 1950.
- How many homes in Sioux County have flood insurance?
- 3 residential flood insurance policies are in force in Sioux County, covering about 0.3% of homes. The program has paid $374 on 2 claims here since 1978.
- What is the weather like in Sioux County?
- At Breien, average highs reach 86°F in Jul and lows fall to 1°F in Jan (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.