Need segment-level traffic data?

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

Get insights →
Traffic heat map of Summit County, Colorado: 224 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 70 and Summit Boulevard

Summit County, Colorado Traffic Counts

How busy are the roads of Summit County, Colorado? We measure 224 road miles, divided into 2,293 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, I 70, carries 43,743 vehicles a day, 8.6 times the average road. The breakdown below covers volume, trucks, congestion and driver profiles for retailers, logistics planners and engineers.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
Find my place
total traffic icon

Total Traffic Volume & Performance in Summit County, Colorado

Traffic

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

vehicles per day5,112
Trucks

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

11.8%
Average travel time

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

27.7 min
Congestion ratio

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

18.1%
Drivers’ average age

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

44.8 yrs
Drivers’ average income

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

$112,675

Our data shows 5,112 vehicles per day on the average road in Summit County, Colorado, and 1,708,847 vehicle-miles traveled per day (≈624 million per year) across its 224 miles of monitored roads. At 11.8%, the truck share runs above the 8.4% across Colorado: about 1 in 8 vehicles.

Shorter trips than 87% of counties in Colorado

Summit sees 24% lower average daily traffic volume than the state average (5,112 vehicles per day against 6,752), suggesting less demand on each road - a critical factor for logistics and site planning. In total volume terms, its road network carries about 1.3% of Colorado's statewide total of vehicle-miles. 73% of counties in Colorado see less traffic than Summit's 5,112 vehicles per day.

The average trip takes 27.7 minutes, 17% lower than the state level. 87% of counties in Colorado have a longer average travel time than Summit's 27.7 minutes.

Congestion is somewhat higher than the state level, at a ratio of 18.1% (15% higher) - crucial for traffic control improvement and logistics planning.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Summit County, Colorado

Trafficvehicles per day8,266
Trucks15.6%
Average travel time44.7 min
Congestion ratio20.0%
Drivers’ average age44.5 yrs
Drivers’ average income$105,598

A little more than half of the driving in Summit County, Colorado happens on highways: 62% of all vehicle-miles. The average highway carries 8,266 vehicles per day, 81% more than the average non-highway road in the same area, which carries 4,574 vehicles per day.

Highways make up 44% of the monitored road miles (99 miles, 334 segments), so they carry more than their share: 1,061,238 vehicle-miles traveled per day (≈387 million per year).

74% of counties in Colorado move less traffic on their highways.

More highway trucks than 77% of counties in Colorado

At 15.6%, highway truck share is 39% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

75% of counties in Colorado see a lower highway truck share than Summit's 15.6%. 77% of counties in Colorado see fewer highway trucks per day than Summit's roughly 1,293.

non-highway traffic icon

Non-highway Traffic in Summit County, Colorado

Trafficvehicles per day4,574
Trucks5.6%
Average travel time24.8 min
Congestion ratio17.8%
Drivers’ average age44.9 yrs
Drivers’ average income$116,515

Local roads carry a significant share of travel in Summit County, Colorado: 38% of all vehicle-miles. A typical local road sees 4,574 vehicles per day.

Local roads make up 56% of the monitored road miles (126 miles in 1,959 segments) but carry less than their share of travel: 647,609 vehicle-miles traveled per day (≈236 million per year). About 1 in 18 vehicles on non-highway roads is a truck (5.6%).

Drivers from higher-income areas than 90% of counties in Colorado

The concentration of trucks on non-highway roads is 64% lower than on highways.

The non-highway congestion ratio of 17.8% is 18% higher than the state level, suggesting slower local mobility than the state average.

90% of counties in Colorado see lower average driver income among trip origins than Summit. 75% of counties in Colorado have an older driver population than Summit.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and a long afternoon plateau from 2:00 PM to 6:00 PM, with volumes reaching approximately 80% higher than the daily average.
Weekend traffic:
Weekend traffic is about as busy as on weekdays (+4%): leisure and through trips largely replace the commute.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
July–September is the high season, with volumes +14% versus the annual average.
Lowest month:
May is the quietest month, with volumes -17% versus the annual average.

Data Finding: Hourly & Seasonal Patterns

In Summit County, Colorado, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +14% in high season.

Summit County vs. Colorado Traffic Comparison

Summit County's biggest difference from the Colorado average is its truck share, 41% above it. Its highway truck share is also 39% above.

MetricSummit CountyColorado averageDifference
Traffic5,1126,752-24.3%
Truck % (Total Traffic)11.8%8.4%+41.0%
Truck % (Highway)15.6%11.2%+39.0%
Avg. Travel Time27.7 min33.2 min-16.6%

How Summit County compares

Summit County moves more traffic than any nearby county

Set against the average of the 4 areas nearest to it, Summit County sees 30.2% shorter typical trips and moves 2.6 times the total daily travel; it has the second busiest roads of the five. Busier roads and shorter trips together - destinations here sit closer to one another than in the areas around it.

Summit 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
Summit County5,11211.8%1,708,84727.7 min18.1%
Clear Creek County, Colorado5,22713.7%1,551,11453.2 min16.4%
Gilpin County, Colorado2,48913.3%186,68241.0 min10.3%
Lake County, Colorado3,2048.1%195,07034.0 min13.1%
Grand County, Colorado4,2847.7%728,10530.3 min13.5%
Colorado average6,7528.4%N/A33.2 min15.7%

Summit County ranked within Colorado

Average driver income places Summit County #7 of 64 in Colorado - the top quarter of the state.

Summit County ranked among 64 county-level areas in Colorado (1 = highest); measures without data in every county rank a smaller field, down to 54.
MeasureSummit CountyColorado rank
Traffic volume (AADT)5,112#18 of 64
Highway vehicle-miles per day1,061,238#15 of 54
Truck share on highways15.6%#14 of 54
Highway trucks per day1,293#13 of 54
Average travel time27.7 min#55 of 64
Average driver income$112,675#7 of 64
Average driver age44.8 yrs#48 of 64

Summit County ranks #7 of 64 on average driver income but #55 of 64 on average travel time - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Summit County, Colorado

Traffic concentrates on a few corridors: the three busiest roads average 31,916 vehicles a day, against 5,112 on the average road in Summit County.

I 70 is the busiest road, at 43,743 vehicles a day, 5,826 of them trucks (13.3%). That is 66% more than the next road, Summit Boulevard (26,324). It also carries the most trucks.

Trips using Eisenhower Memorial Bore are long: a median of 96.0 minutes against 27.7 county-wide, the mark of a through route.

Eisenhower Memorial Bore skews older: its drivers' median age is 53.4, compared with 44.8 county-wide.

Freight stands out on Gerald R. Ford Memorial Highway: trucks are 19.4% of the traffic there, against 11.8% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 70Motorway · 43,743vehicles5,826trucks · 13.3%
Road class
Motorway
Congestion ratio
44.7%
Median trip time
37.7 min
Drivers’ median age
44.6 yrs
Drivers’ average income
$111,696

Delays build on I 70: its congestion ratio of 45% over free-flow time is well above the county's 18%.

2Summit BoulevardPrimary road · 26,324vehicles1,187trucks · 4.5%
Road class
Primary road
Congestion ratio
35.8%
Median trip time
25.9 min
Drivers’ median age
44.7 yrs
Drivers’ average income
$116,474

At 5.1 times the county average, Summit Boulevard draws drivers from neighborhoods averaging $116,474 in household income.

3CO 9Primary road · 25,682vehicles1,282trucks · 5.0%
Road class
Primary road
Congestion ratio
29.5%
Median trip time
24.0 min
Drivers’ median age
45.0 yrs
Drivers’ average income
$122,738

A main artery: CO 9's busiest stretch carries 5.0 times the county average; trucks are 5.0% of it, below the county-wide 11.8%.

4Main StreetPrimary road · 23,083vehicles1,514trucks · 6.6%
Road class
Primary road
Congestion ratio
39.9%
Median trip time
21.6 min
Drivers’ median age
44.8 yrs
Drivers’ average income
$122,558

The busiest stretch of Main Street carries 4.5 times the county average; trucks are 6.6% of it, below the county-wide 11.8%.

5Gerald R. Ford Memorial HighwayMotorway · 23,051vehicles4,463trucks · 19.4%
Road class
Motorway
Congestion ratio
26.0%
Median trip time
63.7 min
Drivers’ median age
45.1 yrs
Drivers’ average income
$99,020

Drivers on Gerald R. Ford Memorial Highway are on long journeys, a median 63.7 minutes against 27.7 county-wide: a through route more than a local street.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 70Motorway · #1 by traffic43,743vehicles5,826trucks · 13.3%
2Gerald R. Ford Memorial HighwayMotorway · #5 by traffic23,051vehicles4,463trucks · 19.4%
3Eisenhower Memorial BoreMotorway · 17,015vehicles2,980trucks · 17.5%
Road class
Motorway
Congestion ratio
42.5%
Median trip time
96.0 min
Drivers’ median age
53.4 yrs
Drivers’ average income
$94,146

On its busiest stretch, Eisenhower Memorial Bore carries 3.3 times the county average; trucks are 17.5% of it, above the county-wide 11.8%.

4Edwin C. Johnson Memorial BoreMotorway · 19,740vehicles2,467trucks · 12.5%
Road class
Motorway
Congestion ratio
49.3%
Median trip time
45.8 min
Drivers’ median age
44.2 yrs
Drivers’ average income
$105,345

Travel on Edwin C. Johnson Memorial Bore's busiest stretch runs 49% over free-flow time, against 18% across the county, so expect slower peak hours.

5Main StreetPrimary road · #4 by traffic23,083vehicles1,514trucks · 6.6%
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

SummitDepartment 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.
link arrow icon
Data current as of:
Q3 2026

Explore further

TrafficZoom platform

— street-level analytics and custom corridor reports.

Map AI

— demographics, housing and mobility data.

Counties near Summit County

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

Need segment-level traffic data?

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