Granite County, MT Tornado Risk & Storm Shelter Cost
Granite County's tornado history, by the numbers
Since 1971, NOAA has logged 2 tornado tracks crossing Granite County - one about every 38.5 years, which lands it in our Minimal band. Nationally, Granite County ranks at the 7th percentile for tornado frequency. Montana has 56 counties in this dataset; Granite County ranks 46 of them by frequency.
Granite County's EF4-5 history
Granite County's record has no EF4-5 tornado - its 2 tracks split 2 weak and 0 significant. That does not rule one out in the future, only that none has been recorded since 1950.
What a storm shelter costs near Granite County
For a Granite County homeowner, budget $2,890-$13,280 for a shelter or safe room ($7,645 typical) - this pass found no Montana-specific rebate on top of FEMA's underlying 75% national cost-share program.
The outage nobody plans for
A direct hit is not required for Granite County to lose power - outbreak-wide outages across Montana regularly reach homes and businesses well outside the actual tracks. A battery bank covers that gap without a generator's fuel and venting needs.
Read this before you rely on it
This is a county-level figure, not a per-address probability. Granite County covers about 1,727 square miles, so a single touch here counts the same as a single touch in a county a fraction of that size. Pre-radar-era records (before the 1990s) are also documented by NOAA as undercounting weaker tornadoes in sparsely-instrumented areas. Granite County has about 3,602 residents.