Colorado Crash Hot Spots: The Most Dangerous Roads and Intersections

Where Colorado Traffic Deaths Happen

CDOT’s preliminary count puts 2025 at 701 people killed on Colorado roads, up from 689 the year before. Speeding played a part in about a third of those deaths, and impaired driving in about the same share. Pedestrians had one of their deadliest years on record: CDOT later updated the 2025 count to 131 people killed while walking, more than double the 64 in 2015. Work zones were the bright spot, with deaths there down 70%.

Denver and Weld counties tied for the most deaths in 2025 with 76 each, and El Paso County, home to Colorado Springs, was right behind at 75. Pueblo County jumped 60%, to 40 deaths. CDOT’s 2025 Strategic Highway Safety Plan aims to eliminate traffic deaths and serious injuries, and it puts speeding and impairment at the center of its Safe Driving focus.

An In-Depth Look at Colorado’s High-Risk Roads

Some of Colorado’s worst roads are Denver city streets, and some are mountain interstates far from any city. Here’s what makes each one tricky, with published figures wherever they exist.

1. Federal Boulevard (U.S. 287 and SH 88): North Denver to the Southwest Side

Federal is Denver’s long north-south workhorse: six lanes of buses, trucks and commuters lined with driveways, strip malls and bus stops. People cross mid-block to reach those stops, and the crossing at Alameda Avenue, on the edge of Westwood, is one spot locals know to be careful.

Denver put Federal on its High Injury Network and made it one of two pilot corridors in its SPEED safety program. The city’s own numbers show 643 crashes and 6 deaths on Federal in 2023, and 578 crashes and 5 deaths from January through November 2025, with two more people killed on Federal in the weeks after. Farther east, Santa Fe Drive at Alameda and at Mississippi both made Westword’s 2024 top ten of Denver intersections by crash count.

2. Colfax Avenue (U.S. 40): Lakewood Through Denver to Aurora

Colfax runs the width of the metro: strip-mall arterial in Lakewood, dense through Capitol Hill, wide and fast again in Aurora. The intersections at Lincoln Street, by the Capitol, and at Colorado Boulevard both see heavy bus and foot traffic, long crossings and right-turn conflicts. East Colfax at North Colorado Boulevard was another of the intersections in Westword’s 2024 top ten.

West Colfax has seen real change. New signal timing and lower speeds in 2020 cut deaths on the corridor by 71%, and Denver followed with a $15.5 million pedestrian rebuild between Irving Street and Sheridan Boulevard. East of Colorado Boulevard, Colfax is still a bus rapid transit work zone, so expect lane shifts.

3. Colorado Boulevard: Central Denver

Colorado Boulevard carries heavy traffic from I-25 north to I-70 through the middle of the city. The junctions at Mississippi Avenue and at Leetsdale Drive are classic rear-end and angle-crash spots, especially at rush hour when drivers brake hard for a light or squeeze in a left turn.

Leetsdale meets Colorado at an angle, so left-turning drivers have a harder time seeing what’s coming. Watch for pedestrians near the bus stops and shopping centers, too.

4. Interstate 25: New Mexico Line to Wyoming

I-25 is the spine of the Front Range, running from Trinidad through Pueblo, Colorado Springs, Denver and Fort Collins. Through central Denver, short merges and constant lane changes mean sudden slowdowns and chain-reaction crashes, worse in snow. The stretch between Castle Rock and Monument, known as the Gap, is another place where traffic stacks up fast.

Wind and blowing dirt are a real hazard south of Colorado Springs. On Feb. 17, 2026, a brown-out set off a 36-vehicle pileup on I-25 south of Pueblo that killed five people, according to the State Patrol.

5. I-70 Mountain Corridor: Floyd Hill to Glenwood Canyon

West of Denver, I-70 crosses Floyd Hill into Idaho Springs, climbs to the Eisenhower Tunnel, then crosses Vail Pass before dropping through Glenwood Canyon. Steep grades, tight curves, heavy trucks and weekend ski traffic make it a hard drive even in good weather. The State Patrol found that 52% of crashes on Vail Pass, between mileposts 182 and 193, were speed-related from 2021 to 2023.

Floyd Hill is a construction zone until CDOT finishes its new bridges and express lane between Homestead Road (Exit 247) and Idaho Springs (Exit 241), with the whole project due in 2029. In Glenwood Canyon, the State Patrol investigated 30 crashes from October 2025 through January 2026, down from 65 the winter before. The patrol mostly credits a milder winter, though a left-lane truck ban and variable speed limits may have helped.

6. I-225 and Parker Road: Aurora

I-225 runs north from I-25 near the Tech Center through Aurora to I-70, and its interchanges with Parker Road and Alameda Avenue mean drivers merging and exiting at highway speed. Aurora police say the I-225 and South Parker Road interchange has more crashes than any other spot in the city, based on two years of crash data.

During a police enforcement and education push there in 2026, with signs urging safe driving, crashes fell from 14 to 2, comparing six weeks before May 15 with six weeks after. CDOT counted 55 traffic deaths in Aurora in 2025, up 22% from the year before.

7. U.S. 285: C-470 to Bailey

U.S. 285 is the commuter route for Conifer, Pine Junction and Bailey, and a busy mountain highway on weekends when people head for Kenosha Pass and Fairplay. Closer to Denver it’s four lanes, with concrete barrier down the middle through Bailey, but in much of Park County beyond it’s two lanes with thin shoulders.

Head-on and run-off-road crashes are the big risks, on curves, in fog and when drivers pass slower traffic. Deer and elk at night add to it.

8. Mountain Canyons: U.S. 6 (Clear Creek Canyon) and SH 119 (Boulder Canyon)

U.S. 6 winds through Clear Creek Canyon from Golden toward I-70, with rock walls on one side, the creek on the other and a string of tunnels. SH 119 climbs Boulder Canyon from Boulder to Nederland, the way to Eldora, and it’s packed with skiers, cyclists and sightseers.

Both are narrow two-lane roads full of blind curves, where shaded ice, rockfall and drivers stopping for a view cause trouble.

More High-Crash Locations Across Colorado

Denver, Colorado Springs and Aurora, the state’s three biggest cities, all have recent data on where their worst crashes happen, and so do Pueblo and the mountain interstates.

Several of these places are getting work. Denver set a goal of cutting deaths on Federal and Alameda in half by the end of 2026 and plans to add speed safety cameras along both this year. Colorado Springs’ draft plan targets a 35% cut in serious crashes by 2035, measured against 2023. And on I-70, the Floyd Hill rebuild should have westbound traffic on its new alignment by the end of 2027 and eastbound by the end of 2028.

How to Stay Safe on Colorado’s Most Dangerous Roads

None of this means avoiding these roads. It means driving them knowing where the trouble is.

For Drivers:

1. Slow down: Speeding contributed to about a third of Colorado’s traffic deaths in 2025. On Vail Pass, more than half of crashes are speed-related, so ease off on the grades and curves.
2. Never drive impaired: Impaired driving played a part in 235 deaths in 2025. Line up a ride before you go out.
3. Buckle up, every seat: 188 people killed in 2025 weren’t wearing a seat belt.
4. Watch for people on foot on the big arterials: On Federal, Colfax and Colorado Boulevard, people cross mid-block to reach bus stops, often after dark.
5. Give trucks room in the mountains: On I-70 and in Glenwood Canyon, semis need long stopping distances on downgrades. Don’t cut in front of them.
6. Follow the traction law: When CDOT puts it in effect on I-70, your tires or chains need to meet it. Bald tires are how a lot of mountain closures start.

For Pedestrians:

1. Cross at signals and marked crosswalks: On six-lane roads like Federal, crossing mid-block leaves drivers almost no time to react.
2. Be visible after dark: Most of Colorado’s pedestrian deaths happen at night, and nearly 60% over the past five years happened between September and February. Wear something light or reflective.
3. Make eye contact: Don’t assume a turning driver sees you. Wait until the car has stopped.

For Cyclists:

1. Use bike lanes and trails: Where you can, stick to protected lanes and paths like the Cherry Creek and Clear Creek trails.
2. Plan canyon rides carefully: Boulder Canyon and Clear Creek Canyon have narrow shoulders and blind curves. Ride early, ride single file and use lights.
3. Watch intersections closely: Turning drivers often don’t see cyclists. Never assume a driver will yield.

General Tips:

1. Check COtrip before a mountain drive: CDOT’s traveler site shows closures, chain laws and crashes on I-70 and U.S. 285.
2. Keep winter gear in the car: Blankets, water, a scraper and a phone charger matter if I-70 closes behind you.

What to Do If You’re Injured in a Colorado Car Accident

A bad crash on I-25, Federal Boulevard or a mountain pass can leave you hurt and unsure what to do first. The first hours and days matter, for your health and your wallet.

1. Call 911. Even if nobody seems badly hurt, get police to the scene. They’ll write the official crash report, which is what insurers go by. If anyone is seriously injured, ask for an ambulance.
2. Get checked out. Concussions and internal injuries don’t always show up right away. Go to the ER or urgent care, and follow up with your own doctor in the days after.
3. Document the scene if you can. If it’s safe, photograph the vehicles, the damage and the license plates, plus skid marks, signs, weather and road conditions. Get witnesses’ names and phone numbers, and swap insurance information with the other driver without admitting fault.
4. Be careful with adjusters. The other driver’s insurance company may call soon after the crash. You can politely decline a recorded statement until you have your crash report and understand your options.
5. Keep everything. Medical records, bills, repair estimates, missed work, and every letter or email from an insurer.

The report stays with whichever agency investigated the crash. City police, such as Denver, Aurora and Colorado Springs, take most crashes inside city limits, while the Colorado State Patrol handles most crashes on state highways and interstates outside them, with reports from its Central Records Unit. Our Colorado crash report guide walks through getting a copy from each.

Don’t know which agency took the report, or would rather skip the paperwork? We can get a copy of your report for you at no cost.

Colorado Crash Hot Spot Questions

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Nearby states: Wyoming crash hot spots · New Mexico crash hot spots · Utah crash hot spots · Kansas crash hot spots

For the latest, crashes from around the state are posted in Colorado accident news and our recent accident alerts.