I-84 in Idaho: fatal crashes
From 2015 to 2024, 187 fatal crashes on I-84 in Idaho killed 204 people, the most of any numbered road in Idaho. In 2024 there were 15 fatal crashes and 15 deaths on the road.
An interstate running through 9 counties of Idaho. All fatal crashes in Idaho.
Deaths on I-84 in Idaho by year
| Year | Fatal crashes | Deaths |
|---|---|---|
| 2015 | 16 | 19 |
| 2016 | 32 | 33 |
| 2017 | 22 | 24 |
| 2018 | 21 | 26 |
| 2019 | 16 | 18 |
| 2020 | 13 | 15 |
| 2021 | 21 | 22 |
| 2022 | 13 | 13 |
| 2023 | 18 | 19 |
| 2024 | 15 | 15 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Where on I-84 in Idaho: the counties with the most fatal crashes
Elmore County had the most fatal crashes on I-84 from 2015 to 2024: 45, with 47 deaths. Counties are listed from 5 fatal crashes.
| County | 2024 | 2015 to 2024 | Deaths | |
|---|---|---|---|---|
| 1 | Elmore | 2 | 45 | 47 |
| 2 | Ada | 3 | 38 | 43 |
| 3 | Jerome | 2 | 33 | 36 |
| 4 | Canyon | 1 | 21 | 22 |
| 5 | Payette | 3 | 16 | 18 |
| 6 | Gooding | 3 | 13 | 14 |
| 7 | Cassia | 0 | 10 | 11 |
| 8 | Minidoka | 1 | 10 | 11 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
When fatal crashes happen on I-84 in Idaho
The heaviest slot is Tuesday, noon to 4 pm, with 11 fatal crashes from 2015 to 2024. The worst hour is 3 pm to 4 pm; the worst month is August.
| Midnight to 4 | 4 to 8 am | 8 to noon | Noon to 4 | 4 to 8 pm | 8 to midnight | |
|---|---|---|---|---|---|---|
| Sun | 2.1 percent, 4 fatal crashes | 1.1 percent, 2 fatal crashes | 1.6 percent, 3 fatal crashes | 1.6 percent, 3 fatal crashes | 3.7 percent, 7 fatal crashes | 0.0 percent, 0 fatal crashes |
| Mon | 1.6 percent, 3 fatal crashes | 1.6 percent, 3 fatal crashes | 2.1 percent, 4 fatal crashes | 1.1 percent, 2 fatal crashes | 2.1 percent, 4 fatal crashes | 2.7 percent, 5 fatal crashes |
| Tue | 2.1 percent, 4 fatal crashes | 4.8 percent, 9 fatal crashes | 2.1 percent, 4 fatal crashes | 5.9 percent, 11 fatal crashes | 1.6 percent, 3 fatal crashes | 0.0 percent, 0 fatal crashes |
| Wed | 2.7 percent, 5 fatal crashes | 3.2 percent, 6 fatal crashes | 2.7 percent, 5 fatal crashes | 4.8 percent, 9 fatal crashes | 1.1 percent, 2 fatal crashes | 2.7 percent, 5 fatal crashes |
| Thu | 2.7 percent, 5 fatal crashes | 1.6 percent, 3 fatal crashes | 1.1 percent, 2 fatal crashes | 2.1 percent, 4 fatal crashes | 0.5 percent, 1 fatal crashes | 1.1 percent, 2 fatal crashes |
| Fri | 2.7 percent, 5 fatal crashes | 2.1 percent, 4 fatal crashes | 2.7 percent, 5 fatal crashes | 2.1 percent, 4 fatal crashes | 4.3 percent, 8 fatal crashes | 3.2 percent, 6 fatal crashes |
| Sat | 1.6 percent, 3 fatal crashes | 1.6 percent, 3 fatal crashes | 3.2 percent, 6 fatal crashes | 3.7 percent, 7 fatal crashes | 4.3 percent, 8 fatal crashes | 4.3 percent, 8 fatal crashes |
By hour
By month
- Jan9.1%
- Feb1.6%
- Mar9.1%
- Apr7.5%
- May7.0%
- Jun9.1%
- Jul9.1%
- Aug11.8%
- Sep10.2%
- Oct8.0%
- Nov7.5%
- Dec10.2%
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
What fatal crashes on I-84 in Idaho first hit
| First harmful event | Fatal crashes | Share |
|---|---|---|
| Rollover | 66 | 35% |
| Collision with another vehicle | 54 | 29% |
| Fixed object (tree, pole, barrier, ditch) | 34 | 18% |
| Pedestrian | 18 | 9.6% |
| Other | 9 | 4.8% |
| Parked vehicle | 6 | 3.2% |
| Cyclist | 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 on I-84 in Idaho compare with the state
Shares of fatal crashes from 2015 to 2024, against the share across all of Idaho. A share is only given over 20 crashes.
| I-84 | Idaho | ||
|---|---|---|---|
| On rural stretches | 78% | 75% | above the Idaho share |
| At or near an intersection | 0.5% | 21% | below the Idaho share |
| In the dark, road unlit | 33% | 27% | above the Idaho share |
| A drinking driver | 18% | 31% | below the Idaho share |
| Speeding | 20% | 22% | below the Idaho share |
| Occupants killed unbelted | 56% | 58% | below the Idaho share |
| Hit-and-run | 2.1% | 1.7% | about the same as the Idaho share |
| A motorcycle involved | 5.9% | 14% | below the Idaho share |
| Pedestrians among the dead | 9.8% | 6.9% | above the Idaho share |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Other roads in Idaho with a page
All fatal crashes in Idaho, with every road ranked.
Where the I-84 numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash whose road NHTSA filed as I-84 in Idaho (filed under 3 spellings, such as "I-84", "I-84 US-26", "I-84 W"). Ramps, frontage and service roads are left out. A fatal crash is one in which someone died within 30 days. The full method.