Fatal crashes in Ada County, Idaho
In 2024, 29 people died in 29 fatal crashes in Ada County, 6.5% fewer than in 2023. From 2015 to 2024 the county recorded 240 fatal crashes and 259 deaths, the most of any county in Idaho.
5.4 deaths per 100,000 residents, against 11.9 across Idaho in 2024; 5.3 against 13.1 a year over 2015 to 2024. Population 535,799, Census Bureau estimate. All fatal crashes in Idaho.
Deaths in Ada County by year
| Year | Fatal crashes | Deaths |
|---|---|---|
| 2024 | 29 | 29 |
| 2023 | 31 | 31 |
| 2022 | 19 | 21 |
| 2021 | 21 | 21 |
| 2020 | 17 | 20 |
| 2019 | 21 | 29 |
| 2018 | 28 | 31 |
| 2017 | 29 | 30 |
| 2016 | 23 | 24 |
| 2015 | 22 | 23 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
The deadliest roads in Ada County
I-84 had the most fatal crashes of any numbered road in Ada County from 2015 to 2024: 38, with 43 deaths. The 7 roads listed held 40% of all fatal crashes in Ada County from 2015 to 2024; 1 is an interstate, 1 US route, 5 state highways. Interstate, US and state routes with 5 or more fatal crashes in the county; county roads and city streets are in the county's total but not listed.
| Road | Fatal crashes | Deaths | 2022 to 2024 | ||
|---|---|---|---|---|---|
| 1 | I-84 | 38 | 43 | 11 | |
| 2 | US 20 | 15 | 15 | 7 | |
| 3 | State Highway 21 | 11 | 13 | 3 | no page |
| 4 | State Highway 44 | 10 | 10 | 4 | no page |
| 5 | State Highway 55 | 10 | 10 | 5 | |
| 6 | State Highway 16 | 7 | 8 | 1 | no page |
| 7 | State Highway 69 | 6 | 7 | 2 | no page |
Cities NHTSA filed, with their fatal crashes from 2015 to 2024: Boise 91, Meridian 36, Eagle 16, Garden City 9, Kuna 8. The city is not filed for crashes outside a city.
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 Ada County
The heaviest slot is Friday, 4 to 8 pm, with 13 fatal crashes from 2015 to 2024. The worst hour is 7 pm to 8 pm; the worst month is October.
| Midnight to 4 | 4 to 8 am | 8 to noon | Noon to 4 | 4 to 8 pm | 8 to midnight | |
|---|---|---|---|---|---|---|
| Sun | 2.9 percent, 7 fatal crashes | 0.4 percent, 1 fatal crashes | 2.1 percent, 5 fatal crashes | 1.7 percent, 4 fatal crashes | 3.3 percent, 8 fatal crashes | 2.5 percent, 6 fatal crashes |
| Mon | 1.7 percent, 4 fatal crashes | 0.4 percent, 1 fatal crashes | 3.8 percent, 9 fatal crashes | 1.7 percent, 4 fatal crashes | 4.2 percent, 10 fatal crashes | 2.1 percent, 5 fatal crashes |
| Tue | 2.1 percent, 5 fatal crashes | 0.8 percent, 2 fatal crashes | 2.5 percent, 6 fatal crashes | 4.2 percent, 10 fatal crashes | 4.6 percent, 11 fatal crashes | 1.2 percent, 3 fatal crashes |
| Wed | 1.7 percent, 4 fatal crashes | 2.5 percent, 6 fatal crashes | 0.8 percent, 2 fatal crashes | 1.2 percent, 3 fatal crashes | 4.6 percent, 11 fatal crashes | 3.8 percent, 9 fatal crashes |
| Thu | 2.1 percent, 5 fatal crashes | 1.7 percent, 4 fatal crashes | 2.1 percent, 5 fatal crashes | 2.1 percent, 5 fatal crashes | 3.3 percent, 8 fatal crashes | 2.1 percent, 5 fatal crashes |
| Fri | 2.9 percent, 7 fatal crashes | 0.8 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes | 3.3 percent, 8 fatal crashes | 5.4 percent, 13 fatal crashes | 2.9 percent, 7 fatal crashes |
| Sat | 3.8 percent, 9 fatal crashes | 0.8 percent, 2 fatal crashes | 1.7 percent, 4 fatal crashes | 1.7 percent, 4 fatal crashes | 3.3 percent, 8 fatal crashes | 3.3 percent, 8 fatal crashes |
By hour
By month
- Jan3.8%
- Feb5.0%
- Mar7.9%
- Apr6.2%
- May5.4%
- Jun7.9%
- Jul10.4%
- Aug10.0%
- Sep10.8%
- Oct13.3%
- Nov7.9%
- Dec11.2%
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
What fatal crashes in Ada County first hit
The first harmful event was a collision with another vehicle in 39%; a fixed object such as a tree, pole or barrier in 25%, a pedestrian in 20%, a rollover in 8.8%.
| First harmful event | Fatal crashes | Share |
|---|---|---|
| Collision with another vehicle | 94 | 39% |
| Fixed object (tree, pole, barrier, ditch) | 59 | 25% |
| Pedestrian | 47 | 20% |
| Rollover | 21 | 8.8% |
| Cyclist | 8 | 3.3% |
| Other | 8 | 3.3% |
| Parked vehicle | 3 | 1.2% |
| 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 Ada County compare with Idaho
A drinking driver was recorded in 34% of fatal crashes in Ada County from 2015 to 2024, above the Idaho share of 31%; speeding in 28%, above the Idaho share of 22%; a hit-and-run in 2.1%, about the Idaho share; a driver recorded as distracted in 13%, below the Idaho share of 15%; 44% of passenger-vehicle occupants killed with belt use known were unbelted, below the Idaho share of 58%. Shares of fatal crashes from 2015 to 2024, against the share across all of Idaho. A share is only given over 20 crashes.
| Ada | Idaho | ||
|---|---|---|---|
| On rural roads | 25% | 75% | below the Idaho share |
| At or near an intersection | 36% | 21% | above the Idaho share |
| In the dark, road unlit | 18% | 27% | below the Idaho share |
| A drinking driver | 34% | 31% | above the Idaho share |
| Speeding | 28% | 22% | above the Idaho share |
| A distracted driver (as recorded) | 13% | 15% | below the Idaho share |
| Occupants killed unbelted | 44% | 58% | below the Idaho share |
| Hit-and-run | 2.1% | 1.7% | about the same as the Idaho share |
| A motorcycle involved | 23% | 14% | above the Idaho share |
| Pedestrians among the dead | 19% | 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
Questions about fatal crashes in Ada County
- How many people died in car accidents in Ada County in 2024?
- 29 people died in 29 fatal crashes in Ada County, Idaho, in 2024, 6.5% fewer than in 2023. That is 5.4 deaths per 100,000 residents, against 11.9 across Idaho.
- What is the deadliest road in Ada County?
- I-84 had the most fatal crashes of any numbered road in Ada County from 2015 to 2024: 38, with 43 deaths.
- When do fatal crashes in Ada County happen most often?
- The heaviest slot from 2015 to 2024 was Friday, 4 to 8 pm, with 13 fatal crashes.
- How many fatal crashes in Ada County involved a drinking driver?
- 82 of 240 fatal crashes in Ada County from 2015 to 2024 involved a driver NHTSA recorded as drinking, 34%, against 31% across Idaho.
Other counties in Idaho with a page
- Canyon County
- Kootenai County
- Bonneville County
- Twin Falls County
- Jerome County
- Bingham County
- Bannock County
- Elmore County
- Bonner County
- Nez Perce County
- Idaho County
- Cassia County
All fatal crashes in Idaho, with every county ranked.
Where the Ada County numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash NHTSA filed in Ada County (county code 1). 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. The full method.