Fatal crashes in Jefferson County, Montana
In 2024, 7 people died in 7 fatal crashes in Jefferson County, Montana, up from 3 in 2023. From 2015 to 2024 the county recorded 48 fatal crashes and 52 deaths, the 9th most of 55 counties in Montana.
Deaths in Jefferson County by year
| Year | Fatal crashes | Deaths |
|---|---|---|
| 2024 | 7 | 7 |
| 2023 | 3 | 3 |
| 2022 | 7 | 7 |
| 2021 | 10 | 13 |
| 2020 | 8 | 8 |
| 2019 | 3 | 3 |
| 2018 | 3 | 3 |
| 2017 | 3 | 3 |
| 2016 | 1 | 1 |
| 2015 | 3 | 4 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
The deadliest roads in Jefferson County
I-90 had the most fatal crashes of any numbered road in Jefferson County from 2015 to 2024: 17, with 20 deaths. The 2 roads listed held 54% of all fatal crashes in Jefferson County from 2015 to 2024; 2 are interstates. 71% of the county's fatal crashes were on an interstate, US or state route; the other 29% were on county roads and city streets. Routes are listed from 5 fatal crashes.
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
When fatal crashes happen in Jefferson County
48 fatal crashes in Jefferson County, Montana from 2015 to 2024 have a known time, too few for any one weekday and time of day to stand out. The worst hour is midnight to 1 am; the worst month is July.
| Midnight to 4 | 4 to 8 am | 8 to noon | Noon to 4 | 4 to 8 pm | 8 to midnight | |
|---|---|---|---|---|---|---|
| Sun | 2.1 percent, 1 fatal crash | 2.1 percent, 1 fatal crash | 4.2 percent, 2 fatal crashes | 8.3 percent, 4 fatal crashes | 8.3 percent, 4 fatal crashes | 2.1 percent, 1 fatal crash |
| Mon | 0.0 percent, 0 fatal crashes | 6.2 percent, 3 fatal crashes | 0.0 percent, 0 fatal crashes | 4.2 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crash |
| Tue | 4.2 percent, 2 fatal crashes | 2.1 percent, 1 fatal crash | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crash | 4.2 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes |
| Wed | 2.1 percent, 1 fatal crash | 0.0 percent, 0 fatal crashes | 6.2 percent, 3 fatal crashes | 4.2 percent, 2 fatal crashes | 2.1 percent, 1 fatal crash | 2.1 percent, 1 fatal crash |
| Thu | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crash |
| Fri | 0.0 percent, 0 fatal crashes | 4.2 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crash | 4.2 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes |
| Sat | 6.2 percent, 3 fatal crashes | 2.1 percent, 1 fatal crash | 4.2 percent, 2 fatal crashes | 2.1 percent, 1 fatal crash | 4.2 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes |
By hour
By month
- Jan6.2%
- Feb6.2%
- Mar2.1%
- Apr6.2%
- May10.4%
- Jun12.5%
- Jul16.7%
- Aug6.2%
- Sep8.3%
- Oct12.5%
- Nov8.3%
- Dec4.2%
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
What fatal crashes in Jefferson County first hit
The first harmful event was a rollover in 40%; a fixed object such as a tree, pole or barrier in 23%, a collision with another vehicle in 19%, a parked vehicle in 4.2%.
| First harmful event | Fatal crashes | Share |
|---|---|---|
| Rollover | 19 | 40% |
| Fixed object (tree, pole, barrier, ditch) | 11 | 23% |
| Collision with another vehicle | 9 | 19% |
| Other | 6 | 13% |
| Parked vehicle | 2 | 4.2% |
| Cyclist | 1 | 2.1% |
| Pedestrian | 0 | 0.0% |
| Not reported | 0 | 0.0% |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
How fatal crashes in Jefferson County compare with Montana
The largest difference from Montana: from 2015 to 2024, 100% of fatal crashes in Jefferson County were on rural roads, against 84% across Montana. Below the Montana share: intersections and pedestrians. Shares of fatal crashes from 2015 to 2024, against the share across all of Montana. A share is only given over 20 crashes; above or below means more than chance would give on 48 crashes.
| Jefferson | Montana | ||
|---|---|---|---|
| On rural roads | 100% | 84% | above the Montana share |
| At or near an intersection | 4.2% | 15% | below the Montana share |
| In the dark, road unlit | 33% | 35% | about the same as the Montana share |
| A drinking driver | 40% | 44% | about the same as the Montana share |
| Speeding | 29% | 36% | about the same as the Montana share |
| A distracted driver (as recorded) | 8.3% | 8.7% | about the same as the Montana share |
| Occupants killed unbelted | 66% | 64% | about the same as the Montana share |
| Hit-and-run | 2.1% | 2.7% | about the same as the Montana share |
| A motorcycle involved | 8.3% | 14% | about the same as the Montana share |
| Pedestrians among the dead | 0.0% | 7.5% | below the Montana share |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Questions about fatal crashes in Jefferson County, Montana
- How many people died in car accidents in Jefferson County in 2024?
- 7 people died in 7 fatal crashes in Jefferson County, Montana, in 2024, up from 3 in 2023. Source: NHTSA's Fatality Analysis Reporting System (FARS).
- What is the deadliest road in Jefferson County?
- I-90 had the most fatal crashes of any numbered road in Jefferson County from 2015 to 2024: 17, with 20 deaths.
- How many fatal crashes in Jefferson County involved a drinking driver?
- 19 of 48 fatal crashes in Jefferson County from 2015 to 2024 involved a driver NHTSA recorded as drinking, 40%, against 44% across Montana.
Other counties in Montana with a page
- Yellowstone County
- Flathead County
- Missoula County
- Big Horn County
- Gallatin County
- Cascade County
- Lake County
- Lewis and Clark County
- Glacier County
- Lincoln County
- Ravalli County
- Park County
All fatal crashes in Montana, with every county ranked.
Where the Jefferson County numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash NHTSA filed in Jefferson County (county code 43). A fatal crash is one in which someone died within 30 days. The rate per 100,000 uses the Census Bureau's population estimate for the county; it is the only figure here not counted from FARS. Totals from state highway departments and news reports can differ: they count from their own crash reports, often before every death within 30 days is known, while NHTSA's file is checked against death certificates and revised once a year. The full method.
Download every county with a page as CSV. Free to reuse with credit: “Fatal Crash Data, fatalcrashdata.com/fatal-crashes/montana/jefferson-county/, from NHTSA FARS (2024 Annual Report File).”