Montana faces flood risk from spring snowmelt, glacial lake outbursts, and riverine flooding along the Missouri, Yellowstone, Clark Fork, and Flathead rivers. The June 2022 catastrophic flooding in south-central Montana destroyed portions of Highway 212 and devastated communities along the Yellowstone River including Red Lodge, Cooke City, and Gardiner. The flood was triggered by rapid snowmelt and rain on the Beartooth Mountains causing over $1 billion in damage. Glacial lake outburst floods are an increasing concern as climate change causes Montana's remaining glaciers to retreat creating unstable lakes behind natural dams. The Yellowstone River, Montana's largest undammed river, regularly floods its broad valley through eastern Montana. The 1978 flood in Billings caused over $50 million in damage along the Yellowstone. Western Montana faces flash flood risk in narrow valleys along the Clark Fork, Bitterroot, and Flathead rivers. Glacier National Park has experienced infrastructure damage from flooding events. The state has approximately 200 NFIP-participating communities with high-risk zones concentrated along major river corridors and in mountain valleys.
Montana Flood Zones
FEMA Flood Zone Lookup in Montana
Look up any address in Montana to find its FEMA flood zone designation, insurance requirements, and base flood elevation — sourced from the official National Flood Hazard Layer.
Zone A and Zone AE along the Yellowstone, Missouri, Clark Fork, and Flathead rivers; Zone X (shaded) for moderate-risk areas in Billings, Missoula, and Great Falls; Zone AH for shallow flooding in glacial valley communities; Zone AO for overland flooding along mountain streams.
Yellowstone County, Missoula County, Cascade County, Gallatin County, Carbon County
NFIP premiums typically range $400-$800 for standard-risk properties. Riverfront properties along the Yellowstone and Missouri rivers can run $1,000-$2,500 annually. Mountain valley properties with glacial flood risk may face limited insurance availability.
Frequently Asked Questions — Montana
Did Montana really have $1 billion in flood damage in 2022?
Yes. The June 2022 Yellowstone flood was catastrophic destroying highways, bridges, and homes across south-central Montana. Communities like Red Lodge, Gardiner, and Cooke City were severely impacted.
Can glaciers cause floods in Montana?
Yes. Glacial lake outburst floods occur when melting glaciers create unstable lakes behind natural debris dams. When these dams fail they release catastrophic floods. Montana's remaining glaciers are retreating due to climate change increasing risk.
When does Montana flood?
Spring snowmelt from April through June is Montana's primary flood period. Rapid warming, rain on snow, and glacial melt can accelerate runoff. Summer thunderstorms can also trigger flash flooding in mountain valleys.
Disclaimer: FloodZoneCheck is a free research tool using public FEMA data, not an official Standard Flood Hazard Determination. Lenders require a certified determination from a licensed provider. Zone boundaries can cross a single parcel — confirm exact risk and insurance requirements with FEMA or your insurer before relying on this for a purchase or insurance decision.
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