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 128 numbered roads in Colorado. In 2024 there were 2 fatal crashes and 2 deaths on the road.
A 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 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
62 fatal crashes on State Highway 121 in Colorado from 2015 to 2024 have a known time, too few for any one weekday and time of day to stand out. The worst hour is 7 pm to 8 pm; the worst month is April.
| 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 crash | 1.6 percent, 1 fatal crash | 1.6 percent, 1 fatal crash | 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 crash | 1.6 percent, 1 fatal crash | 4.8 percent, 3 fatal crashes | 4.8 percent, 3 fatal crashes | 1.6 percent, 1 fatal crash |
| Wed | 0.0 percent, 0 fatal crashes | 3.2 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes | 1.6 percent, 1 fatal crash | 3.2 percent, 2 fatal crashes | 1.6 percent, 1 fatal crash |
| Thu | 3.2 percent, 2 fatal crashes | 1.6 percent, 1 fatal crash | 1.6 percent, 1 fatal crash | 3.2 percent, 2 fatal crashes | 4.8 percent, 3 fatal crashes | 6.5 percent, 4 fatal crashes |
| Fri | 1.6 percent, 1 fatal crash | 0.0 percent, 0 fatal crashes | 3.2 percent, 2 fatal crashes | 1.6 percent, 1 fatal crash | 3.2 percent, 2 fatal crashes | 8.1 percent, 5 fatal crashes |
| Sat | 3.2 percent, 2 fatal crashes | 1.6 percent, 1 fatal crash | 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
The largest difference from Colorado: from 2015 to 2024, 1.6% of fatal crashes on State Highway 121 in Colorado were on rural roads, against 39% across Colorado. Also above the Colorado share: intersections and pedestrians. Below it: unlit roads at night and unbelted occupants. Shares of fatal crashes from 2015 to 2024, against the share across all of Colorado. A share is only given over 20 crashes; above or below means more than chance would give on 62 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 |
| A distracted driver (as recorded) | 4.8% | 9.8% | about the same as the Colorado share |
| Occupants killed unbelted | 32% | 54% | below the Colorado share |
| Hit-and-run | 11% | 6.1% | about the same as the Colorado share |
| A motorcycle involved | 24% | 21% | about the same as 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 on 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. Source: NHTSA's Fatality Analysis Reporting System (FARS).
- 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. 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.