Jefferson County, MT Tornado Risk & Storm Shelter Cost
How likely is a tornado in Jefferson County, MT?
Since 2023, NOAA has logged 1 tornado track crossing Jefferson County - one about every 76.9 years, which lands it in our Minimal band. Nationally, Jefferson County ranks at the 5th percentile for tornado frequency. Within Montana alone, Jefferson County ranks 48 of 56 counties for tornado frequency.
Jefferson County's EF4-5 history
Jefferson County's record has no EF4-5 tornado - its 1 track split 0 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 Jefferson County
For a Jefferson 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
The storm that misses Jefferson County outright can still take its power out - outbreak-scale outages across Montana are common well beyond the tracked path. A battery-backup unit handles that without a generator's setup or fuel.
Read this before you rely on it
This is a county-level figure, not a per-address probability. Jefferson County covers about 1,657 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. Jefferson County has about 13,304 residents.