Sanders County, Montana
Natural disaster risk, federal disaster history and flood insurance facts.
Sanders County, Montana has a relatively low overall risk from natural hazards in FEMA's National Risk Index. Its risk score is lower than 53% of US counties. It ranks 19th of 56 counties in Montana. The costliest hazards here are inland flooding, cold waves and wildfires. FEMA estimates about $9.0 million a year in expected losses, or roughly $726 per resident. Since 1974 it has been included in 14 federal disaster or emergency declarations for natural events (7 major disasters). The most recent was in April 2026 (severe winter storm and straight-line winds). Only 26 homes here carry federal flood insurance.
FEMA National Risk Index December 2025; OpenFEMA declarations to Nov 6, 2026; NFIP records. Updated November 6, 2026.
Top risks in Sanders County
- Check the FEMA flood map for your address, and ask the seller or landlord about past flooding.
- Price a flood policy now. Most new federal policies take 30 days to start.
- Insulate pipes in outside walls, crawl spaces and garages.
- Know how to shut off the main water valve.
- Clear dry plants and debris within 5 feet of the house.
- Get home insurance quotes early; availability varies by area.
All 18 hazards
What the ratings mean ›| Hazard | Rating | Score | Expected loss a year | |
|---|---|---|---|---|
| Inland flooding | 61.9 | $6M | ||
| Cold wave | 66.5 | $1M | ||
| Wildfire | 91.2 | $969K | ||
| Earthquake | 67.9 | $422K | ||
| Ice storm | 78.8 | $223K | ||
| Winter weather | 88.1 | $212K | ||
| Landslide | 96.8 | $149K | ||
| Heat wave | 31.1 | $86K | ||
| Lightning | 18.5 | $38K | ||
| Strong wind | 7.3 | $32K | ||
| Tornado | 4.7 | $10K | ||
| Hail | 4.5 | $6K | ||
| Drought | 20.0 | $2K | ||
| Avalanche | 67.1 | $2K |
Scores are percentiles: a score of 90 means higher risk than about 90% of US counties for that hazard. Hazards FEMA does not rate here are left out. Social vulnerability is very high and community resilience is very low in FEMA's measures.
Federal disaster history
Recent disasters nationwide ›Declarations by decade
Federal declarations for natural events that included Sanders County. 2020s bar runs to November 2026.
By type
Most recent
Show all 14
Montana also had 36 statewide declarations that did not name single counties.
Storm history since 1956
Tornado risk by county ›The National Weather Service has logged 67 storm reports in Sanders County since 1956, with 0 deaths and 1 injury and about $236,000 in reported damage. The strongest on record here was a tornado of unknown strength on July 9, 1978.
Strongest tornadoes
| Date | Strength | Near | Hurt / killed |
|---|---|---|---|
| Jul 9, 1978 | n/a | – | 0 / 0 |
Most damaging storms
| Date | Type | Near | Damage |
|---|---|---|---|
| Dec 11, 2025 | Flood | Thompson Falls | $100K |
| May 15, 1994 | Thunderstorm Wind | Thompson Falls | $50K |
| Jul 17, 2007 | Thunderstorm Wind | Dixon | $30K |
| Aug 2, 2010 | Flash Flood | Camas | $15K |
| Jul 3, 2022 | Hail | Lone Pine | $6K |
| May 27, 1993 | Hail | Thompson Falls | $5K |
Source: NOAA Storm Events Database, county-based reports through Jul 16, 2026. Tornado records start in 1950, hail and wind in 1955, and floods and other storm types in 1996, so older decades undercount. Damage is in dollars of the year it happened and is often an estimate. Winter storms, heat and hurricanes are logged by forecast zone, not county, so they are not counted here.
Flood insurance in Sanders County
Check your address flood zone ›National Flood Insurance Program (NFIP) records only; private flood policies are not included. Home counts as of Aug 3, 2026. Since 2021 NFIP prices each home separately under Risk Rating 2.0, so your price depends on the building, not the county. Ask an agent for a quote.
Homes in Sanders County
Older homes and mobile homes usually suffer more damage in storms, floods and earthquakes, and can cost more to insure. If you are buying, ask about roof age, foundation bolting and any retrofits. Source: US Census Bureau, American Community Survey 2020 to 2024 5-year estimates; 6,808 housing units.
Compare in Montana
All 56 ›| Largest counties | Overall risk | Top hazard |
|---|---|---|
| Yellowstone County | Inland flooding | |
| Gallatin County | Earthquake | |
| Missoula County | Inland flooding | |
| Flathead County | Inland flooding | |
| Cascade County | Inland flooding | |
| Lewis and Clark County | Cold wave | |
| Ravalli County | Wildfire | |
| Silver Bow County | Cold wave |
Neighboring counties
| County | Overall risk | Declarations |
|---|---|---|
| Missoula County | 19 | |
| Flathead County | 13 | |
| Bonner County, ID | 16 | |
| Lake County | 6 | |
| Lincoln County | 12 | |
| Shoshone County, ID | 14 | |
| Mineral County | 8 |
Common questions about Sanders County
What is the biggest natural hazard in Sanders County?
Inland flooding has the highest expected yearly losses in Sanders County, about $5.8 million a year in FEMA's estimate. Cold wave is second at $1.1 million.
How many federal disasters has Sanders County had?
Sanders County has been included in 14 federal disaster or emergency declarations for natural events since 1974, including 7 major disasters. The most recent was Severe Winter Storm and Straight-Line Winds in April 2026.
Is Sanders County a high-risk place to live?
Its overall rating is Relatively Low, 19th highest of 56 in Montana. A county rating covers the whole area. Risk at one address can be much higher or lower, so check the FEMA flood map and ask about the home's history.
Do I need flood insurance in Sanders County?
Standard home insurance does not cover flooding. About 1 in 250 homes in Sanders County has federal flood insurance. Lenders require it in mapped high-risk zones, but many flood claims come from outside those zones.
How many tornadoes has Sanders County had?
NOAA records list 1 tornadoes in Sanders County since 1950. The strongest was a tornado of unknown strength on July 9, 1978. The weather service has also logged 24 hail reports and 8 floods here.
Sources: FEMA National Risk Index (December 2025), OpenFEMA Disaster Declarations Summaries, and NFIP policy and claims data. Hazard Compass is independent and not affiliated with FEMA. These figures describe the whole county, not a single property, and are not insurance or safety advice. Report a problem.