Ada County, Idaho: fatal crash statistics

Counties of Idaho by year (CSV)Cite this page

FARS records 29 deaths in 29 fatal crashes in Ada County in 2024.

FARS records 259 deaths in 240 fatal crashes in the county from 2015 to 2024.

From 2015 to 2024 the rate is 5.3 deaths for each 100,000 residents in a year.

The rate of Idaho in the same years is 13.1.

By deaths from 2015 to 2024, Ada County was number 1 of 44 counties of Idaho.

Deaths in Ada County rose by 37.0% between the ten years 2005 to 2014 (189) and the ten years 2015 to 2024 (259).

In the counties of Idaho the deaths rose by 7.9% between the same years.

From 2015 to 2024, 25.1% of the fatal crashes in Ada County with a known setting were rural, against 74.5% in Idaho.

To qualify as a FARS case, the crash had to involve a motor vehicle traveling on a trafficway customarily open to the public and must have resulted in the death of a motorist or a non-motorist within 30 days of the crash.
The set of first files, known as the Annual Report File (ARF), is released following the crash year. The ARF is replaced about a year later with a final file, which contains additional cases or updates to cases that had become available after the ARF was released.
NHTSA's words. Source: NHTSA, Fatality Analysis Reporting System Analytical User's Manual, 1975-2024 (DOT HS 813 794, April 2026), copied on 2 Oct 2026.

This page rests on the FARS 2024 annual file. NHTSA released it on 1 Apr 2026. NHTSA can revise the counts in the final file. Release dates

Figure 1.Deaths in Ada County by year, 2015 to 2024

Table 1 has the numbers. Go to the table

Since the last update: no figure of this county has a change on record.

Deaths and fatal crashes by year

Table 1.Ada County: deaths and fatal crashes by year, 2015 to 2024
Year	Deaths	Fatal crashes	Crashes with a driver recorded as drinking
2024	29	29	12
2023	31	31	7
2022	21	19	9
2021	21	21	7
2020	20	17	7
2019	29	21	9
2018	31	28	7
2017	30	29	8
2016	24	23	6
2015	23	22	10
2015 to 2024	259	240	82

Each year from 1975

Figure 2.Deaths in Ada County by year, 1975 to 2024

Tallest column: 43 (1979)2024: 29

The columns with a stronger shade are the years 2015 to 2024.

Table 2.Ada County: deaths and fatal crashes by year, 1975 to 2024
Year	Deaths	Fatal crashes
2024	29	29
2023	31	31
2022	21	19
2021	21	21
2020	20	17
2019	29	21
2018	31	28
2017	30	29
2016	24	23
2015	23	22
2014	15	15
2013	16	16
2012	18	16
2011	9	9
2010	17	15
2009	18	16
2008	16	14
2007	23	22
2006	31	27
2005	26	22
2004	23	22
2003	22	21
2002	22	20
2001	19	17
2000	14	14
1999	13	12
1998	14	14
1997	27	23
1996	17	16
1995	28	26
1994	29	24
1993	27	23
1992	22	22
1991	17	15
1990	24	21
1989	25	22
1988	23	18
1987	21	19
1986	21	21
1985	27	22
1984	21	19
1983	21	21
1982	15	13
1981	26	25
1980	26	22
1979	43	33
1978	30	28
1977	28	26
1976	26	23
1975	21	20

Note: a count of 1 or 2 is written "1 or 2". A death is in FARS when it occurs in 30 days or less after the crash.

Rate for each 100,000 residents

Table 3.Ada County beside Idaho and the United States: deaths for each 100,000 residents
Period	Ada County	Idaho	United States
2024	5.4	11.9	11.5
2015 to 2024, in a year	5.3	13.1	11.8

Note: the rate divides the deaths in the county by its residents. Persons who do not live in the county are in the deaths, not in the residents.

Population: Census Bureau estimates, vintage 2025. Ada County had 535,225 residents in 2024.

Factors that NHTSA records

Table 4.Ada County: counts by recorded factor, 2015 to 2024
Factor	Count	Counted among	Share	Share in Idaho
A driver recorded as drinkingof 240 fatal crashes	82	240 fatal crashes	34.2%	31.2%
A speeding-related driverof 240 fatal crashes	67	240 fatal crashes	27.9%	22.4%
No restraint usedof 125 occupant deaths with restraint use known	54	125 occupant deathswith restraint use known	43.2%	58.3%
Pedestriansof 259 deaths	49	259 deaths	18.9%	6.9%
Bicyclistsof 259 deaths	8	259 deaths	3.1%	1.4%
Motorcyclistsof 259 deaths	56	259 deaths	21.6%	13.1%
On a rural roadof 239 fatal crashes with the condition reported	60	239 fatal crasheswith the condition reported	25.1%	74.5%
In the darkof 240 fatal crashes with the condition reported	109	240 fatal crasheswith the condition reported	45.4%	35.7%

Note: FARS records a driver as drinking when police reported alcohol involvement or a test of the driver was positive for alcohol. It is not NHTSA's alcohol-impaired measure, which uses a blood alcohol concentration of .08 g/dL or higher. One crash can be in two or more rows. NHTSA's definitions

Note that alcohol data is often missing. For that reason, this data element may under-count the actual number of drinking drivers.

NHTSA's words. Source: NHTSA, Fatality Analysis Reporting System Analytical User's Manual, 1975-2024 (DOT HS 813 794, April 2026), copied on 2 Oct 2026.

Weekday, time and road class

Table 5.Ada County: fatal crashes by weekday and time of day, 2015 to 2024
Weekday	Midnight to 6 a.m.	6 a.m. to noon	Noon to 6 p.m.	6 p.m. to midnight	All
Sunday	7	6	5	13	31
Monday	4	10	6	13	33
Tuesday	5	8	19	5	37
Wednesday	6	6	10	13	35
Thursday	5	9	6	12	32
Friday	8	1 or 2	14	14	37
Saturday	9	6	11	9	35
All days	44	46	71	79	240

Note: a cell with a stronger shade has a larger count. The table has the fatal crashes with a known hour and weekday.

Table 6.Ada County: fatal crashes by road function class, 2015 to 2024
Road function class	Fatal crashes	Share	Share in Idaho
Interstate	46	19.2%	15.8%
Other freeways and expressways	1 or 2	0.8%	1.2%
Other principal arterial	96	40.2%	32.9%
Minor arterial	55	23.0%	16.0%
Major collector	23	9.6%	17.4%
Minor collector	0	0.0%	3.0%
Local	17	7.1%	13.8%
Not reported	1 or 2	n/a	n/a

Note: the classes are those of the Federal Highway Administration. The shares are of the crashes with a reported class. Road function classes

Light condition and weather

Table 7.Ada County: fatal crashes by light condition, 2015 to 2024
Light condition	Fatal crashes
Daylight	118
Dark, not lighted	42
Dark, lighted	64
Dawn	3
Dusk	10
Dark, lighting unknown	3
Other or unknown	0

Table 8.Ada County: fatal crashes by weather, 2015 to 2024
Weather	Fatal crashes
Clear	177
Cloudy	44
Rain	12
Snow, sleet or freezing rain	5
Fog, smog or smoke	1 or 2
Crosswinds or blowing sand/snow	0
Other or not reported	0

Routes in the county

Table 9.Signed routes in Ada County that have a page: fatal crashes, 2015 to 2024
Route	Type	In Ada	In all of Idaho
Interstate 84	Interstate	43	200
State Route 21	State highway	11	27
State Route 55	State highway	10	66
US Route 20	US highway	15	101
US Route 26	US highway	1 or 2	40

Note: the table has each route with a page that has a fatal crash in the county, in name order. Local streets and county roads have no page. Their crashes are in the county totals. All routes in Idaho

Adjacent counties

These lists are for navigation. They are in name order.

Figure 3.Ada County on the county map of Idaho

Deaths for each 100,000 residents in a year, 2015 to 2024

Fewer than 104 counties
10 to 14.98 counties
15 to 19.98 counties
20 to 29.914 counties
30 or more10 counties
Ada County: 5.3

The limits of the classes are the same for every state. A county with few residents can show a high rate from few deaths. A class is not a judgement of a county. The full map and the table of counties of Idaho

Table 10.Counties that share a boundary line with Ada County
County	State	Deaths, 2024	Deaths, 2015 to 2024	For each 100,000 residents in a year
Boise County	Idaho	3	60	76.6
Canyon County	Idaho	23	246	10.5
Elmore County	Idaho	3	90	32.2
Gem County	Idaho	1 or 2	28	14.8
Owyhee County	Idaho	3	28	23.3

Source of the list: Census Bureau county adjacency file, 2026 edition.

Counties of similar population

These counties of Idaho have a population nearest to that of Ada County. The list is for navigation and is in name order. The number is the deaths from 2015 to 2024.

Official channels

NHTSA Fatality and Injury Reporting System Tool (FIRST)NHTSA's query tool for FARS counts.
NHTSA FARS EncyclopediaNHTSA's tables of FARS data.
Idaho Office of Highway SafetyThe highway safety office of Idaho.

These links go to the sites of the agencies. They were checked on 2 Oct 2026.

Cite this page

Fatal Roads. Ada County, Idaho: fatal crash statistics. https://fatalroads.com/county/id/ada/. Source: National Highway Traffic Safety Administration, Fatality Analysis Reporting System, FARS 2024 annual file. Data to 31 Dec 2024.

The address of this page does not change.

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Source of the figures

Counts: National Highway Traffic Safety Administration, Fatality Analysis Reporting System, national files of 1975 to 2024. The factors use the vehicle and person files from 2015. Residents: Census Bureau, Population Estimates Program, vintage 2025. Map: Census Bureau cartographic boundary file, 2021 edition. Data to 31 Dec 2024. The figures are totals. No page of this site is about one crash or one person.

How the figures are made. Data sources and licences. Corrections.

Questions

How many deaths did FARS record in Ada in the ten years before 2015?

FARS records 189 deaths in Ada County from 2005 to 2014. It records 259 deaths from 2015 to 2024.

What was the rate of Ada in 2024?

The rate of Ada County in 2024 was 5.4 deaths for each 100,000 residents. The rate of Idaho was 11.9. The rate of the United States was 11.5.

How many fatal crashes in Ada had a driver recorded as drinking?

FARS records a driver as drinking in 82 of 240 fatal crashes from 2015 to 2024. This count is not NHTSA's alcohol-impaired measure. NHTSA says that alcohol data is often missing, so the count may be too low.

How many fatal crashes did FARS record on signed routes in Ada?

5 signed routes in the county have a page. FARS records 80 fatal crashes on them in the county from 2015 to 2024. The table of routes on this page gives the count for each route.