Jefferson County, ID Tornado Risk & Storm Shelter Cost
Jefferson County's tornado history, by the numbers
Since 1980, NOAA has logged 19 tornado tracks crossing Jefferson County - one about every 4 years, which lands it in our Moderate band. Nationally, Jefferson County ranks at the 49th percentile for tornado frequency. Among 44 Idaho counties in this dataset, Jefferson County ranks 2 for how often a tornado touches down.
Jefferson County's EF4-5 history
Jefferson County's record has no EF4-5 tornado - its 19 tracks split 19 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 Idaho-specific rebate on top of FEMA's underlying 75% national cost-share program.
The outage nobody plans for
Power loss after a tornado outbreak in Idaho often reaches homes the storm itself never touched. A battery-backup unit covers the outage without the fuel and venting a generator needs.
Read this before you rely on it
This is a county-level figure, not a per-address probability. Jefferson County covers about 1,094 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 34,854 residents.