Jefferson County, MT truck route planning & crash data
Plan safer truck routes in Jefferson County: commercial truck and garbage truck crashes, dangerous roads, seasonality and route safety data for fleets.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
1 of 382 truck crashes since 2015.
Deadliest roads
How Jefferson County compares with Montana
Jefferson County against Montana and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Jefferson County stands out
Full comparison
| Measure (2015–2025) | Jefferson County | Montana | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 241.9 | 64.3 | 49.7 | 3.8× the state |
| Deaths per 100 crashes | 4.8 | 3.8 | 3.4 | 1.3× the state |
| Injuries per crash | 0.29 | 0.34 | 0.49 | 15% below the state |
| Garbage-truck share | 0.3% | 0.9% | 2.3% | 70% below the state |
| On snow, slush or ice | 39.3% | 39.4% | 6.2% | same |
| Morning rush (6–10 am) | 19.2% | 22.9% | 23.7% | 16% below the state |
| In rain, sleet or snow | 15.0% | 20.6% | 13.8% | 27% below the state |
| Winter months (Nov–Mar) | 52.8% | 54.3% | 41.9% | same |
| After dark | 32.5% | 30.8% | 24.8% | same |
Compared with Montana, Jefferson County is lower on injuries per crash, garbage-truck share and morning rush (6–10 am). It runs above Montana on crashes per 100k residents / yr and deaths per 100 crashes.
What stands out in Jefferson County: 1 in 357 of truck crashes here involve garbage trucks: 0.3%, vs 0.9% in Montana.
Overview
Jefferson County has recorded 382 truck crashes since 2015, with 116 people injured and 17 killed.
Across the years with complete reporting, that is roughly one truck crash every 11 days.
When crashes happen
January has the most truck crashes, 11.8% of the yearly total, while May has the fewest (3.9%).
Winter months (Nov–Mar) carry 52.8% of truck crashes, vs 54.3% for Montana.
The busiest hour is 10–11 am, with 8.4% of truck crashes.
Road surface: 39.3% of truck crashes were on snow, slush or ice (Montana: 39.4%).
Where crashes happen
The deadliest road for trucks in Jefferson County is I-90, with 6 fatal large-truck crashes since 2015. After it: I- 90 (1) and I-15 (1).
Garbage & waste trucks
Garbage and refuse trucks were involved in 1 crash, 0.3% of the total, against 0.9% across Montana.
Route planning tips for Jefferson County fleets
- Plan January schedules with more margin; it is the worst month for truck crashes in Jefferson County.
- Check whether your routes use I-90, the road with the most fatal truck crashes in this area.
- Paste your stops into the free Route Planner to see the risk score, safer alternatives and low bridges.
About the data
This report uses the FMCSA crash file (reported crashes of trucks over 10,000 lb) and NHTSA FARS (fatal crashes). It reports the numbers without guessing at reasons.
Truck crashes by year: all trucks vs garbage trucks
Seasonality: when trucks crash in Jefferson County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (in Jefferson County) |
|---|---|
| I-90 | 6 |
| I- 90 | 1 |
| I-15 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Jefferson County) |
|---|---|
| I-90 | 3 |
| Mm 14 Mt-69 | 2 |
| I-902 Mm237.7 | 1 |
| I-90E Mm239.8 | 1 |
| I-90E Mm259.1 | 1 |
| I-90W Mm255.9 | 1 |
| Mile 0.0 State Hwy 69 | 1 |
| Mm 155.0 I-15S | 1 |
Jefferson County at a glance
| Population | 13,304 |
| Land area | 1,657.0 sq mi |
| Density | 8 per sq mi |
| Median household income (ZIP average) | $96,902 |
Waste facilities and haulers nearby
Historical data: truck crashes in Jefferson County since the 1990s
Combines the FMCSA crash file (all reported truck crashes, real coverage from about 1990) with NHTSA FARS (fatal crashes involving a large truck, 1982–2024).
| Decade | Truck crashes / yr | Change | Fatal crashes / yr (FARS) |
|---|---|---|---|
| 1990s | — | — | 0.6 |
| 2000s | 16 | — | 0.5 |
| 2010s | 24 | +57% | 0.5 |
| 2020s | 36 | +48% | 1.4 |
In the 2000s about 16 truck crashes a year were reported; in the 2020s, about 36. Reporting coverage also changed between these periods. NHTSA counts 0.2 fatal large-truck crashes a year in 2016–19 and 1.4 a year in 2020–24.
Cities, towns & communities in Jefferson County
ZIP codes in Jefferson County
Nearby counties
Questions fleets ask about Jefferson County
How common are truck crashes in Jefferson County?
Jefferson County has had 382 reported truck crashes since 2015, injuring 116 people and killing 17.
What is the most dangerous road for trucks in Jefferson County?
I-90 had 6 fatal crashes involving a large truck in Jefferson County since 2015, more than any other road.
Which month has the most truck crashes in Jefferson County?
Truck crashes in Jefferson County peak in January, with 11.8% of the year's crashes.
How many garbage truck accidents happen in Jefferson County?
Since 2015, Jefferson County has reported 1 garbage-truck crash, or 0.3% of its truck crashes.
How does Jefferson County compare with Montana for truck crashes?
Jefferson County records 241.9 truck crashes per 100,000 residents a year, against 64.3 across Montana.
How can I plan a safer truck route in Jefferson County?
The free Route Planner takes your stops and returns a route risk score, safer alternatives and low-bridge warnings.
2026 is a partial year. Updated October 2026.