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Traffic heat map of Jefferson County, Colorado: 1,044 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 70 and 6th Avenue Freeway

Jefferson County, Colorado Traffic Counts

Our Jefferson County, Colorado traffic data covers 27,363 road segments over 1,044 road miles, with an average segment of just 201 ft. It ranks among the top 5 counties in Colorado for average daily traffic. Whether you are evaluating a new retail location, planning routes or assessing infrastructure, these numbers replace guesswork.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
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Total Traffic Volume & Performance in Jefferson County, Colorado

Traffic

The average number of vehicles that travel each day over any road in the road network.

vehicles per day8,231
Trucks

The percentage of the total traffic volume composed of heavy vehicles.

5.9%
Average travel time

The average time of travel averaged among all vehicles traveling on the road network.

33.4 min
Congestion ratio

The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.

17.1%
Drivers’ average age

Average age of residents in the geographic areas where the vehicle trips originated.

43.9 yrs
Drivers’ average income

Average income of residents in the geographic areas where the vehicle trips originated.

$122,542

Our data shows 8,231 vehicles per day on the average road in Jefferson County, Colorado, and 10,806,936 vehicle-miles traveled per day (≈3.9 billion per year) across its 1,044 miles of monitored roads. Trucks are a smaller part of the mix than across Colorado: 5.9% against 8.4%.

Busier roads than 94% of counties in Colorado

Jefferson sees 22% higher average daily traffic volume than the state average (8,231 vehicles per day against 6,752), suggesting more demand on each road - a factor worth weighing in site selection and logistics planning. In total volume terms, its road network carries about 8.5% of Colorado's statewide total of vehicle-miles. Jefferson carries more traffic than 94% of counties in Colorado.

Journey times here (33.4 minutes on average) closely track the state level. 59% of counties in Colorado have a longer average travel time than Jefferson's 33.4 minutes.

The congestion ratio of 17.1% runs slightly higher than the state level (9% higher).

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Jefferson County, Colorado

Trafficvehicles per day25,753
Trucks7.7%
Average travel time38.2 min
Congestion ratio46.2%
Drivers’ average age44.0 yrs
Drivers’ average income$126,195

Highways carry a significant share of travel in Jefferson County, Colorado: 44% of all vehicle-miles. The average highway carries 25,753 vehicles per day, 237% more than the average non-highway road in the same area, which carries 7,642 vehicles per day.

With 18% of the road miles (185 miles in 889 segments), highways punch above their length, carrying 4,780,437 vehicle-miles traveled per day (≈1.7 billion per year).

By highway travel volume, that ranks Jefferson in the top 5 counties in Colorado.

Lower highway truck share than 96% of counties in Colorado

Highway truck concentration here runs 31% lower than the state average, at 7.7%. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

Jefferson's highway truck share (7.7%) is lower than 96% of counties in Colorado. By raw truck volume, Jefferson carries more highway trucks than 85% of counties in Colorado.

non-highway traffic icon

Non-highway Traffic in Jefferson County, Colorado

Trafficvehicles per day7,642
Trucks4.5%
Average travel time33.2 min
Congestion ratio16.1%
Drivers’ average age43.9 yrs
Drivers’ average income$120,810

A little more than half of the driving in Jefferson County, Colorado happens on local roads: 56% of all vehicle-miles. The average non-highway road carries 7,642 vehicles per day.

Spread over 859 miles and 26,474 segments, 82% of the road network, local roads carry a lighter load per mile: 6,026,499 vehicle-miles traveled per day (≈2.2 billion per year). The truck share on non-highway roads is 4.5%.

Drivers from higher-income areas than 94% of counties in Colorado

Non-highway roads carry a truck concentration that's 42% lower than the highway network.

Non-highway congestion (16.1%) runs slightly higher than the state level (7% higher).

94% of counties in Colorado see lower average driver income among trip origins than Jefferson. Jefferson's median driver age is lower than 81% of counties in Colorado.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 7:00 AM to 12:00 PM and PM peak 3:00 PM–6:00 PM, with volumes reaching approximately 93% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 12% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +9% versus the annual average.
Lowest month:
January is the quietest month, with volumes -12% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Jefferson County, Colorado, the peak hour concentrates about 8% of the day's traffic, and there is a noticeable seasonal swing of +9% in high season.

Jefferson County vs. Colorado Traffic Comparison

The highway truck share sets Jefferson County apart: 31% below the Colorado average. Its truck share is also 30% below.

MetricJefferson CountyColorado averageDifference
Traffic8,2316,752+21.9%
Truck % (Total Traffic)5.9%8.4%-29.6%
Truck % (Highway)7.7%11.2%-31.4%
Avg. Travel Time33.4 min33.2 min+0.6%

How Jefferson County compares

Jefferson County against nearby counties

Nothing in this table sets Jefferson County sharply apart from the 4 areas nearest to it, though it has the second busiest roads of the five. Bigger and busier at once: more road than the areas around it and heavier traffic on it, which makes it the centre of gravity for travel in this part of the map.

Jefferson County and the 4 nearest county-level areas by centroid distance, with the Colorado average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Jefferson County8,2315.9%10,806,93633.4 min17.1%
Douglas County, Colorado6,6146.9%8,581,07030.9 min16.0%
Gilpin County, Colorado2,48913.3%186,68241.0 min10.3%
Denver County, Colorado9,5126.3%13,746,46834.5 min19.7%
Clear Creek County, Colorado5,22713.7%1,551,11453.2 min16.4%
Colorado average6,7528.4%N/A33.2 min15.7%

Jefferson County ranked within Colorado

Truck share on highways places Jefferson County #52 of 54 in Colorado - the bottom quarter of the state.

Jefferson County ranked among 64 county-level areas in Colorado (1 = highest); measures without data in every county rank a smaller field, down to 54.
MeasureJefferson CountyColorado rank
Traffic volume (AADT)8,231#5 of 64
Highway vehicle-miles per day4,780,437#5 of 54
Truck share on highways7.7%#52 of 54
Highway trucks per day1,988#9 of 54
Average travel time33.4 min#38 of 64
Average driver income$122,542#5 of 64
Average driver age43.9 yrs#52 of 64

Jefferson County ranks #5 of 54 on highway travel volume but #52 of 54 on truck share on highways. It carries some of the heaviest highway traffic in Colorado, but very little of it is freight - this is commuter and local car volume, not through-trucking.

Busiest roads in Jefferson County, Colorado

On their busiest stretches, the three busiest roads in Jefferson County carry 76,555 vehicles a day on average, 9.3 times the typical road in the county (8,231).

I 70 is the busiest road, at 85,084 vehicles a day, 7,664 of them trucks (9.0%). It also carries the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 70Motorway · 85,084vehicles7,664trucks · 9.0%
Road class
Motorway
Congestion ratio
61.1%
Median trip time
41.2 min
Drivers’ median age
43.6 yrs
Drivers’ average income
$125,117

I 70 carries 10.3 times the county average on its busiest stretch, where the median trip lasts 41.2 minutes.

26th Avenue FreewayMotorway · 75,306vehicles4,653trucks · 6.2%
Road class
Motorway
Congestion ratio
53.8%
Median trip time
33.4 min
Drivers’ median age
42.1 yrs
Drivers’ average income
$105,933

At 9.1 times the county average, 6th Avenue Freeway draws drivers from neighborhoods averaging $105,933 in household income.

3Denver-Boulder TurnpikeMotorway · 69,275vehicles5,064trucks · 7.3%
Road class
Motorway
Congestion ratio
71.7%
Median trip time
32.3 min
Drivers’ median age
39.3 yrs
Drivers’ average income
$105,875

Travel on Denver-Boulder Turnpike's busiest stretch runs 72% over free-flow time, against 17% across the county, so expect slower peak hours.

4CO 470Motorway · 65,322vehicles4,427trucks · 6.8%
Road class
Motorway
Congestion ratio
58.6%
Median trip time
36.9 min
Drivers’ median age
46.8 yrs
Drivers’ average income
$138,728

A main artery: CO 470's busiest stretch carries 7.9 times the county average; trucks are 6.8% of it, above the county-wide 5.9%.

5Dave Sanders Memorial HighwayMotorway · 59,621vehicles3,606trucks · 6.0%
Road class
Motorway
Congestion ratio
63.1%
Median trip time
34.5 min
Drivers’ median age
46.5 yrs
Drivers’ average income
$144,803

Dave Sanders Memorial Highway is one of the more congested roads here: trips take 63% longer than at free-flow speed, against 17% county-wide.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 70Motorway · #1 by traffic85,084vehicles7,664trucks · 9.0%
2Denver-Boulder TurnpikeMotorway · #3 by traffic69,275vehicles5,064trucks · 7.3%
36th Avenue FreewayMotorway · #2 by traffic75,306vehicles4,653trucks · 6.2%
4CO 470Motorway · #4 by traffic65,322vehicles4,427trucks · 6.8%
5Heartland ExpresswayMotorway · 56,116vehicles4,414trucks · 7.9%
Road class
Motorway
Congestion ratio
61.5%
Median trip time
39.5 min
Drivers’ median age
42.5 yrs
Drivers’ average income
$104,971

Heartland Expressway is a trunk route for the county, carrying 6.8 times the county average on its busiest stretch; trucks are 7.9% of it, above the county-wide 5.9%.

How to read these road counts
  • The first number is AADT, annual average daily traffic: the vehicles passing a point on an average day, both directions combined and trucks included. On a divided highway both carriageways are added together.
  • Traffic changes along a road, with more near interchanges and towns and less in open country. Every figure for a road describes its busiest stretch in the county, so the two rankings show the same numbers for the same road.
  • The second number is the trucks on that stretch, a part of its AADT. The bar splits the AADT into cars and light vehicles (blue) and trucks (amber).
  • See segment-level AADT for any road on TrafficZoom.

Data Sources & Methodology

The data presented on this page is derived from TrafficZoom's proprietary analytics platform, which aggregates and normalizes information from multiple sources, including:

Mobile device location data (anonymized and aggregated)

Road sensor networks and traffic counters

Historical traffic pattern databases

Public traffic count programs published by the

JeffersonDepartment of Transportation

Demographic Baseline for O-D Modeling

U.S. Census Bureau
All metrics represent estimates based on statistical modeling and are intended for strategic planning purposes.
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Data current as of:
Q3 2026

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Counties near Jefferson County

The same traffic breakdown for the areas closest to Jefferson County, Colorado.

Need segment-level traffic data?

Identify traffic patterns street by street and analyze the exact corridors that matter to your project.