Which county in Montana has the lowest flood risk?

Silver Bow has the lowest flood risk in Montana, at 26.0.

What is the flood risk in Silver Bow?

Silver Bow is ranked #1 in Montana for flood risk, at 26.0.

What are the top counties in Montana for flood risk?

Silver Bow (26.0), then Petroleum (35.4), and Gallatin (37.5). The full top 25 is in the table on this page.

How is this flood risk ranking calculated?

Counties in Montana are ranked by flood risk (FEMA National Risk Index, FEMA NRI v1.20), lowest first. Values describe the county, not an individual property. Source vintage is shown on the page.

How does Montana compare to the rest of the US for flood risk?

This list is Montana only. See the national ranking of the lowest counties for flood risk at hearthmap.app/best/lowest-flood-risk.

Lowest Flood Risk Counties in Montana (2026)

Lowest counties for flood risk in Montana

Top 25 of 56 counties with data.

Ranked by flood risk (FEMA National Risk Index, FEMA NRI v1.20), lowest first.

Lowest counties for flood risk in Montana

Rank	County	Value
01	Silver Bow26.0 County page
02	Petroleum35.4 County page
03	Gallatin37.5 County page
04	Deer Lodge38.7 County page
05	Missoula47.1 County page
06	Ravalli48.1 County page
07	Lewis and Clark50.5 County page
08	Treasure53.5 County page
09	Custer53.9 County page
10	Daniels55.3 County page
11	Hill58.1 County page
12	Flathead58.1 County page
13	Richland59.1 County page
14	Yellowstone60.9 County page
15	Cascade63.1 County page
16	Musselshell64.2 County page
17	Granite64.6 County page
18	Lake64.8 County page
19	Wibaux65.9 County page
20	Prairie68.8 County page
21	Roosevelt69.4 County page
22	Fergus70.2 County page
23	Golden Valley70.5 County page
24	Carter70.7 County page
25	Blaine71.4 County page

How this ranking works

This page ranks Montana counties by flood risk, sorted so the lowest places appear first. Click any county to see its housing, schools, crime, and demographics in detail.

For flood risk, a lower value is generally more favorable, so the top of the list is the lowest. Want to weigh flood risk against schools, taxes, commute, and more at once? Use the live map to build a custom match.

Data comes from public sources. Source attribution and the exact data vintage are shown above and on the full map of flood risk.

Frequently asked questions

Which county in Montana has the lowest flood risk?: Silver Bow has the lowest flood risk in Montana, at 26.0.
What is the flood risk in Silver Bow?: Silver Bow is ranked #1 in Montana for flood risk, at 26.0.
What are the top counties in Montana for flood risk?: Silver Bow (26.0), then Petroleum (35.4), and Gallatin (37.5). The full top 25 is in the table on this page.
How is this flood risk ranking calculated?: Counties in Montana are ranked by flood risk (FEMA National Risk Index, FEMA NRI v1.20), lowest first. Values describe the county, not an individual property. Source vintage is shown on the page.
How does Montana compare to the rest of the US for flood risk?: This list is Montana only. See the national ranking of the lowest counties for flood risk at hearthmap.app/best/lowest-flood-risk.