I-15 in Utah: fatal crashes
From 2015 to 2024, 261 fatal crashes on I-15 in Utah killed 303 people, the most of any numbered road in Utah. In 2024 there were 21 fatal crashes and 25 deaths on the road.
An interstate running through 10 counties of Utah. All fatal crashes in Utah. I-15 in every state.
Deaths on I-15 in Utah by year
| Year | Fatal crashes | Deaths |
|---|---|---|
| 2024 | 21 | 25 |
| 2023 | 24 | 30 |
| 2022 | 26 | 29 |
| 2021 | 36 | 49 |
| 2020 | 22 | 24 |
| 2019 | 33 | 35 |
| 2018 | 21 | 24 |
| 2017 | 26 | 26 |
| 2016 | 22 | 24 |
| 2015 | 30 | 37 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Where on I-15 in Utah: the counties with the most fatal crashes
Salt Lake County had the most fatal crashes on I-15 from 2015 to 2024: 44, with 45 deaths. Salt Lake, Utah and Box Elder counties together held 44% of fatal crashes on I-15 in Utah from 2015 to 2024. Counties are listed from 5 fatal crashes.
| County | 2024 | 2015 to 2024 | Deaths | |
|---|---|---|---|---|
| 1 | Salt Lake County | 3 | 44 | 45 |
| 2 | Utah County | 6 | 41 | 47 |
| 3 | Box Elder County | 2 | 30 | 37 |
| 4 | Iron County | 2 | 28 | 31 |
| 5 | Millard County | 4 | 27 | 39 |
| 6 | Davis County | 2 | 26 | 31 |
| 7 | Juab County | 1 | 21 | 21 |
| 8 | Weber County | 0 | 20 | 24 |
| 9 | Washington County | 1 | 15 | 17 |
| 10 | Beaver County | 0 | 9 | 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-15 in Utah
The heaviest slot is Sunday, midnight to 4 am (the night from Saturday), with 16 fatal crashes from 2015 to 2024. The worst hour is 1 am to 2 am; the worst month is May.
| Midnight to 4 | 4 to 8 am | 8 to noon | Noon to 4 | 4 to 8 pm | 8 to midnight | |
|---|---|---|---|---|---|---|
| Sun | 6.2 percent, 16 fatal crashes | 1.9 percent, 5 fatal crashes | 1.2 percent, 3 fatal crashes | 3.1 percent, 8 fatal crashes | 2.3 percent, 6 fatal crashes | 0.8 percent, 2 fatal crashes |
| Mon | 1.2 percent, 3 fatal crashes | 0.4 percent, 1 fatal crash | 4.2 percent, 11 fatal crashes | 3.5 percent, 9 fatal crashes | 1.9 percent, 5 fatal crashes | 1.9 percent, 5 fatal crashes |
| Tue | 1.5 percent, 4 fatal crashes | 1.9 percent, 5 fatal crashes | 0.8 percent, 2 fatal crashes | 0.8 percent, 2 fatal crashes | 2.3 percent, 6 fatal crashes | 2.7 percent, 7 fatal crashes |
| Wed | 1.9 percent, 5 fatal crashes | 2.3 percent, 6 fatal crashes | 2.3 percent, 6 fatal crashes | 2.3 percent, 6 fatal crashes | 1.5 percent, 4 fatal crashes | 0.8 percent, 2 fatal crashes |
| Thu | 1.9 percent, 5 fatal crashes | 3.8 percent, 10 fatal crashes | 1.9 percent, 5 fatal crashes | 3.5 percent, 9 fatal crashes | 1.2 percent, 3 fatal crashes | 2.7 percent, 7 fatal crashes |
| Fri | 0.8 percent, 2 fatal crashes | 2.7 percent, 7 fatal crashes | 1.9 percent, 5 fatal crashes | 5.0 percent, 13 fatal crashes | 4.2 percent, 11 fatal crashes | 1.9 percent, 5 fatal crashes |
| Sat | 4.2 percent, 11 fatal crashes | 4.2 percent, 11 fatal crashes | 1.2 percent, 3 fatal crashes | 5.0 percent, 13 fatal crashes | 2.7 percent, 7 fatal crashes | 1.5 percent, 4 fatal crashes |
By hour
By month
- Jan5.7%
- Feb8.4%
- Mar10.3%
- Apr5.7%
- May11.5%
- Jun6.9%
- Jul9.2%
- Aug10.0%
- Sep7.7%
- Oct7.3%
- Nov10.7%
- Dec6.5%
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Fatal crashes per mile on I-15 in Utah
6.4 fatal crashes a year per 100 miles over 2015 to 2024, on 406 miles of I-15 in Utah, against 5 for all interstates in Utah. That ranks 1 of 3 interstates in Utah and 108 of 172 interstate pages on this site.
Mileage from the FHWA Interstate route log (table 1), the only figure here not counted from FARS. Crashes per mile of road, not per vehicle: FARS records crashes, not traffic.
What fatal crashes on I-15 in Utah first hit
The first harmful event was a collision with another vehicle in 36%; a fixed object such as a tree, pole or barrier in 26%, a rollover in 19%, a pedestrian in 8.8%.
| First harmful event | Fatal crashes | Share |
|---|---|---|
| Collision with another vehicle | 95 | 36% |
| Fixed object (tree, pole, barrier, ditch) | 67 | 26% |
| Rollover | 50 | 19% |
| Pedestrian | 23 | 8.8% |
| Other | 14 | 5.4% |
| Parked vehicle | 12 | 4.6% |
| 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-15 in Utah compare with the state
The largest difference from Utah: from 2015 to 2024, 0.0% of fatal crashes on I-15 in Utah were at or near an intersection, against 27% across Utah. Below the Utah share: drinking drivers, motorcycles and pedestrians. Shares of fatal crashes from 2015 to 2024, against the share across all of Utah. A share is only given over 20 crashes; above or below means more than chance would give on 261 crashes.
| I-15 | Utah | ||
|---|---|---|---|
| On rural stretches | 35% | 40% | about the same as the Utah share |
| At or near an intersection | 0.0% | 27% | below the Utah share |
| In the dark, road unlit | 28% | 24% | about the same as the Utah share |
| A drinking driver | 17% | 23% | below the Utah share |
| Speeding | 33% | 29% | about the same as the Utah share |
| A distracted driver (as recorded) | 8.4% | 6.8% | about the same as the Utah share |
| Occupants killed unbelted | 42% | 45% | about the same as the Utah share |
| Hit-and-run | 2.3% | 3.9% | about the same as the Utah share |
| A motorcycle involved | 8.0% | 16% | below the Utah share |
| Pedestrians among the dead | 9.6% | 14% | below the Utah 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 on I-15 in Utah
- How many fatal crashes have there been on I-15 in Utah?
- 261 fatal crashes killed 303 people on I-15 in Utah from 2015 to 2024. In 2024 there were 21 fatal crashes and 25 deaths. Source: NHTSA's Fatality Analysis Reporting System (FARS).
- Where on I-15 in Utah do the most fatal crashes happen?
- Salt Lake County had the most fatal crashes on I-15 from 2015 to 2024: 44, with 45 deaths. Utah County was second with 41.
- When do fatal crashes on I-15 in Utah happen most often?
- The heaviest slot from 2015 to 2024 was Sunday, midnight to 4 am (the night from Saturday), with 16 fatal crashes.
- How dangerous is I-15 in Utah per mile?
- 6.4 fatal crashes a year per 100 miles over 2015 to 2024, on 406 miles of road, against 5 for all interstates in Utah. That ranks 1 of 3 interstates in Utah and 108 of 172 interstate pages on this site. FARS records crashes, not traffic, so this is crashes per mile of road, not per vehicle.
Other roads in Utah with a page
All fatal crashes in Utah, with every road ranked.
Where the I-15 numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash whose road NHTSA filed as I-15 in Utah (filed under 4 spellings, such as "I-15", "I-15 COLLECTOR", "I-15 NORTHBOUND", "I-15 SOUTHBOUND"). Ramps, frontage and service roads are left out. Where two routes share a road, NHTSA files each crash under one of them, so a shared stretch counts on one route only. A fatal crash is one in which someone died within 30 days. Totals in state and news reports for a road usually differ: they include ramps and frontage roads, or count from preliminary reports. The full method.