State Highway 121 in Colorado: fatal crashes
From 2015 to 2024, 62 fatal crashes on State Highway 121 in Colorado killed 64 people, the 14th most of any numbered road in Colorado. In 2024 there were 2 fatal crashes and 2 deaths on the road.
An state highway running through 3 counties of Colorado. All fatal crashes in Colorado.
Deaths on State Highway 121 in Colorado by year
| Year | Fatal crashes | Deaths |
|---|---|---|
| 2024 | 2 | 2 |
| 2023 | 9 | 9 |
| 2022 | 5 | 5 |
| 2021 | 3 | 3 |
| 2020 | 8 | 8 |
| 2019 | 5 | 6 |
| 2018 | 7 | 7 |
| 2017 | 8 | 8 |
| 2016 | 11 | 12 |
| 2015 | 4 | 4 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Where on State Highway 121 in Colorado: the counties with the most fatal crashes
Jefferson County County had the most fatal crashes on State Highway 121 from 2015 to 2024: 56, with 58 deaths. Counties are listed from 5 fatal crashes.
| County | 2024 | 2015 to 2024 | Deaths | |
|---|---|---|---|---|
| 1 | Jefferson County | 2 | 56 | 58 |
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 State Highway 121 in Colorado
Too few crashes to name a heaviest slot. The grid shows the shares; a share is only given over 20 crashes.
| Midnight to 4 | 4 to 8 am | 8 to noon | Noon to 4 | 4 to 8 pm | 8 to midnight | |
|---|---|---|---|---|---|---|
| Sun | 1.6 percent, 1 fatal crashes | 1.6 percent, 1 fatal crashes | 1.6 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes | 4.8 percent, 3 fatal crashes | 3.2 percent, 2 fatal crashes |
| Mon | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 3.2 percent, 2 fatal crashes | 4.8 percent, 3 fatal crashes | 0.0 percent, 0 fatal crashes |
| Tue | 0.0 percent, 0 fatal crashes | 1.6 percent, 1 fatal crashes | 1.6 percent, 1 fatal crashes | 4.8 percent, 3 fatal crashes | 4.8 percent, 3 fatal crashes | 1.6 percent, 1 fatal crashes |
| Wed | 0.0 percent, 0 fatal crashes | 3.2 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes | 1.6 percent, 1 fatal crashes | 3.2 percent, 2 fatal crashes | 1.6 percent, 1 fatal crashes |
| Thu | 3.2 percent, 2 fatal crashes | 1.6 percent, 1 fatal crashes | 1.6 percent, 1 fatal crashes | 3.2 percent, 2 fatal crashes | 4.8 percent, 3 fatal crashes | 6.5 percent, 4 fatal crashes |
| Fri | 1.6 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes | 3.2 percent, 2 fatal crashes | 1.6 percent, 1 fatal crashes | 3.2 percent, 2 fatal crashes | 8.1 percent, 5 fatal crashes |
| Sat | 3.2 percent, 2 fatal crashes | 1.6 percent, 1 fatal crashes | 3.2 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes | 3.2 percent, 2 fatal crashes | 4.8 percent, 3 fatal crashes |
By hour
By month
- Jan6.5%
- Feb6.5%
- Mar8.1%
- Apr14.5%
- May12.9%
- Jun8.1%
- Jul6.5%
- Aug11.3%
- Sep9.7%
- Oct4.8%
- Nov6.5%
- Dec4.8%
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
What fatal crashes on State Highway 121 in Colorado first hit
The first harmful event was a collision with another vehicle in 47%; a pedestrian in 26%, a fixed object such as a tree, pole or barrier in 13%, a cyclist in 9.7%.
| First harmful event | Fatal crashes | Share |
|---|---|---|
| Collision with another vehicle | 29 | 47% |
| Pedestrian | 16 | 26% |
| Fixed object (tree, pole, barrier, ditch) | 8 | 13% |
| Cyclist | 6 | 9.7% |
| Rollover | 3 | 4.8% |
| Parked vehicle | 0 | 0.0% |
| Other | 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 State Highway 121 in Colorado compare with the state
A drinking driver was recorded in 34% of fatal crashes in State Highway 121 in Colorado from 2015 to 2024, about the Colorado share; speeding in 36%, about the Colorado share; a hit-and-run in 11%, above the Colorado share of 6.1%; 32% of passenger-vehicle occupants killed with belt use known were unbelted, below the Colorado share of 54%. Shares of fatal crashes from 2015 to 2024, against the share across all of Colorado. A share is only given over 20 crashes.
| State Highway 121 | Colorado | ||
|---|---|---|---|
| On rural stretches | 1.6% | 39% | below the Colorado share |
| At or near an intersection | 60% | 32% | above the Colorado share |
| In the dark, road unlit | 1.6% | 21% | below the Colorado share |
| A drinking driver | 34% | 34% | about the same as the Colorado share |
| Speeding | 36% | 35% | about the same as the Colorado share |
| Occupants killed unbelted | 32% | 54% | below the Colorado share |
| Hit-and-run | 11% | 6.1% | above the Colorado share |
| A motorcycle involved | 24% | 21% | above the Colorado share |
| Pedestrians among the dead | 27% | 14% | above the Colorado 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 State Highway 121 in Colorado
- How many fatal crashes have there been on State Highway 121 in Colorado?
- 62 fatal crashes killed 64 people on State Highway 121 in Colorado from 2015 to 2024. In 2024 there were 2 fatal crashes and 2 deaths.
- Where on State Highway 121 in Colorado do the most fatal crashes happen?
- Jefferson County had the most fatal crashes on State Highway 121 from 2015 to 2024: 56, with 58 deaths.
Other roads in Colorado with a page
- I-25
- I-70
- I-76
- State Highway 14
- State Highway 30
- State Highway 470
- State Highway 83
- State Highway 88
- State Highway 95
- US 160
- US 24
- US 285
All fatal crashes in Colorado, with every road ranked.
Where the State Highway 121 numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash whose road NHTSA filed as State Highway 121 in Colorado (filed under 11 spellings, such as "SR-121", "SR-121 N WADSWORTH BLVD", "SR-121 N WADSWORTH PKWY", "SR-121 S WADSWORTH BLVD"). Ramps, frontage and service roads are left out. A fatal crash is one in which someone died within 30 days. The full method.