Dunn County, ND Environment & Hazard Risk
Very Low natural hazard risk, led by hail. 476 storm events since 1996.
- Expected yearly loss
- $4.8M
- Very Low nationally
- Storm events since 1996
- 476
- Most often hail
- Flood insurance policies
- 18
- 0.6% of homes
- Hurricanes nearby
- 0
- Since 1851
Natural hazard risk
FEMA National Risk Index, December 2025
Overall risk
Very Low
Score 10.8 of 100
Social vulnerability
Relatively Moderate
Score 41.7 of 100
Community resilience
Very Low
Score 19.5 of 100
Community resilience runs the other way: a higher rating means a community can recover faster.
Building value exposed: $2.3B · Agriculture value exposed: $99.9M · Risk-adjusted yearly loss: $5.2M
Risk by hazard
- HailRelatively Moderate$1.1M/yr expected annual loss, about 2.2 events a year
- WildfireRelatively Low$608K/yr expected annual loss, about once every 1,149 years
- Winter weatherRelatively Moderate$214K/yr expected annual loss, about 17 events a year
- Ice stormRelatively Moderate$131K/yr expected annual loss, about once every 2 years
- Cold waveRelatively Low$991K/yr expected annual loss, about 14 events a year
- LandslideVery Low$1,118/yr expected annual loss, about once every 1 year
- DroughtVery Low$18.1K/yr expected annual loss, about 28 events a year
- TornadoVery Low$326K/yr expected annual loss, about once every 2 years
- Strong windRelatively Low$152K/yr expected annual loss, about 1.3 events a year
- LightningVery Low$38.9K/yr expected annual loss, about 30 events a year
- Heat waveVery Low$13.2K/yr expected annual loss, about 1.1 events a year
- EarthquakeVery Low$3,328/yr expected annual loss, about once every 12,821 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 2,814 (0.6%)
- Homes in high-risk flood zones
- 0
Storm history
Since 1996: 476 events, 0 deaths, $33.7M in damage
- Hail142
- Thunderstorm Wind82
- High Wind63
- Blizzard37
- Heavy Snow31
- Winter Storm28
- Drought23
- Extreme Cold/Wind Chill19
- Tornado11
- Flood9
Events per year
24 tornadoes on record (EF0 8, EF1 1, EF2 1, F0 7, F1 3, F2 1).
Most damaging storms
Since 1996, ranked by deaths, injuries and damage
- Hail3.25" hail07/10/2016
Killdeer, Dunn County
2 injured, $21M damage
What happened
A slow moving supercell resulted in an extended period of very large hail and damaging wind gusts in and around the city of Killdeer. Hail up to 3.25 inches in diameter completely covered the ground in many locations. The hail combined with wind gusts of 75 mph to cause extreme damage to buildings, trees, and vehicles in the city. At the Killdeer nursing home windows were broken out and four rooms were damaged to the point where they were not habitable. Two residents sustained minor injuries. The first was injured (direct injury) when they were struck by broken flying glass. The other person was injured (direct injury) as they were evacuating their living area due to broken windows and fell on a wet floor as rain and hail were pouring in. Every field light at the new football stadium was destroyed, and every bus at the school was significantly damaged. Significant damage occurred to vehicles including those at a dealership.
- Blizzard04/05/1997
Dunn
1 injured, $1.8M damage
What happened
Warm weather the first three days of April lead much of North Dakota to believe that spring had arrived with temperatures in the 60s and 70s. Mother Nature had other plans. A very strong area of low pressure moved out of the Colorado area into the northern plains. Warm moist air ahead of the low collided with cold air coming down from Canada. The result was the worst blizzard of the season for North Dakota, bringing much of the state to a complete halt. The precipitation began to fall during the afternoon of the 4th (Friday), as rain in the east and freezing rain or sleet in the west. By Friday evening the freezing rain and sleet had changed over to all snow in the west. By Saturday afternoon the heavy snow moved into the central part of the state, reaching trhe eastern part of North Dakota later that night. Snow accumulations were on average 1.5 to 2 inches an hour with 50 to 60 mph winds as well. The blizzard ended in the west on the morning of the 6th (Sunday), but continued into the evening across the east. The additional snow at Bismarck brought the season snowfall total to 101.4 inches, which set an all time record. The old record was 91.8 inches. In Jamestown, they...
- Blizzard01/09/1997
Dunn
1 injured, $1.5M damage
What happened
The second blizzard in less than 1 week brought North Dakota to a virtual standstill. This blizzard didn't bring as much snow as the first storm, but the winds gusted from the northwest as high at 40 mph and they lasted for 3 days. Snowfall amounts from this storm varied from 1-2 inches in the southwest to 2-4 inches in the central. But the strong winds combined with this snow as well as the snow from the blizzard a few days earlier created widespread whiteout conditions that lasted for 3 days. There were numerous communities that halted mail delivery and cancelled school. In Emmons Co. every road was blocked by drifts, some as high as 18 feet. In McLean Co. there was a drift at the intersection of highways 83 and 37 that was 12 feet high and 150 yards long. It took snow plow operators working from both directions 10 hours to open. The Standing Rock Indian Reservation had severe hardship with snow drifts taller than buses blocking all the entrance roads. Most of the people on the reservation ran out of propane to heat their homes, and food shortages were widespread. Again, almost every major road in North Dakota was closed and plows pulled off. In Foster Co., the county road...
- Hail2.75" hail09/04/2014
Manning, Dunn County
$2.3M damage
What happened
There was very significant damage to buildings and automobiles including at a car dealership.
- Flood08/16/2014
Killdeer, Dunn County
$2.1M damage
What happened
Upwards of 10.50 inches of rain in parts of Dunn County led to very significant overland flooding. There was also flooding along the Knife River and its tributaries. There was significant damage to roads and crops. A county emergency declaration was issued.
- Thunderstorm Wind74 kt wind09/04/2014
Dunn Center, Dunn County
1 injured, $300K damage
What happened
Minor injuries occurred to a 9 year old female that was inside a 5th wheel trailer-camper that tipped over. A horse trailer nearby also tipped over. Farm outbuildings and fences were damaged and trees were snapped. There was speculation that the damage could have been caused by a tornado, but determination from photo evidence was that this damage was caused by very high straight line thunderstorm winds.
Drinking water
6 community water systems serve about 1,475 people. Violations since 2021.
None of the systems serving this county had a health-based violation in this period.
- Killdeer City ofServes 939 · Purchased surface water · Local governmentNo health violations+1 monitoring or reporting
- Halliday City ofServes 188 · Purchased surface water · Local governmentNo health violations
- Dunn Center City ofServes 146 · Purchased surface water · Local governmentNo health violations+4 monitoring or reporting
- Dodge City ofServes 87 · Purchased surface water · Local governmentNo health violations+1 monitoring or reporting
- New Hradec WaterworksServes 60 · Purchased surface water · PrivateNo health violations+2 monitoring or reporting
- Manning Water BoardServes 55 · Purchased surface water · Local governmentNo health violations+7 monitoring or reporting
Largest systems by population served. Monitoring and reporting violations mean required tests or notices were late or missing, not that the water was unsafe.
Pollution sites
0 Superfund sites and 1 toxic release facility in Dunn County
Superfund sites
None in this county.
Toxic release facilities
- Bear Creek Gas Plant20,629 lbs released, Killdeer
Total: 20,629 lbs in 2024, 6,315 lbs to air.
Superfund sitesToxic release facilitiesEPA inspections and enforcementAir toxics cancer risk2 historic places
Frequently asked questions
- How risky is Dunn County for natural disasters?
- FEMA rates Dunn County very low for overall natural hazard risk, with expected losses of $4.8M a year. The highest-rated hazards are hail (relatively moderate), wildfire (relatively low), winter weather (relatively moderate).
- What storms are most common in Dunn County?
- Since 1996, NOAA recorded 476 storm events affecting Dunn County, most often hail (142), thunderstorm wind (82), high wind (63).
- How many tornadoes have hit Dunn County?
- 24 tornadoes have been recorded in Dunn County since 1950.
- How many homes in Dunn County have flood insurance?
- 18 residential flood insurance policies are in force in Dunn County, covering about 0.6% of homes.
- What is the weather like in Dunn County?
- At Killdeer, average highs reach 84°F in Aug and lows fall to 4°F in Jan, with 18.1 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.