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Traffic heat map of Yellowstone County, Montana: 701 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Main Street and US 87

Yellowstone County, Montana Traffic Counts

It ranks among the top 3 counties in Montana for average daily traffic. This page breaks down traffic in Yellowstone County, Montana across 701 miles of monitored roads split into 9,819 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
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 Yellowstone County, Montana

Traffic

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

vehicles per day6,471
Trucks

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

8.5%
Average travel time

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

34.2 min
Congestion ratio

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

16.0%
Drivers’ average age

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

46.0 yrs
Drivers’ average income

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

$79,094

The average monitored road in Yellowstone County, Montana carries 6,471 vehicles per day. Across its 701 miles of monitored roads, that adds up to 3,250,724 vehicle-miles traveled per day (≈1.2 billion per year). Trucks are a smaller part of the mix than across Montana: 8.5% against 11.7%.

Busier roads than 98% of counties in Montana

Yellowstone sees 54% higher average daily traffic volume than the state average (6,471 vehicles per day against 4,202), suggesting more demand on each road - heavy exposure for roadside retail, and tight road space for deliveries. Network-wide, Yellowstone accounts for about 11% of Montana's statewide total of vehicle-miles. Yellowstone carries more traffic than 98% of counties in Montana.

The average trip takes 34.2 minutes, 5% lower than the state level. Its average travel time of 34.2 minutes is shorter than 85% of counties in Montana.

At 30% higher than the state level, the 16.0% congestion ratio signals more pronounced congestion - a factor for delivery windows and signal timing.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Yellowstone County, Montana

Trafficvehicles per day6,962
Trucks13.2%
Average travel time33.0 min
Congestion ratio16.2%
Drivers’ average age46.6 yrs
Drivers’ average income$77,767

A significant share of driving in Yellowstone County, Montana, 44% of vehicle-miles, happens on highways. The average highway carries 6,962 vehicles per day, 8% more than the average non-highway road in the same area, which carries 6,441 vehicles per day.

Highways also make up about 37% of the monitored road miles: 258 miles in 570 segments, together carrying 1,432,616 vehicle-miles traveled per day (≈523 million per year).

No more than 2 other counties in Montana move more traffic on their highways.

More highway trucks than 78% of counties in Montana

Highway truck concentration here runs 12% lower than the state average, at 13.2%. The highway traffic mix is typical for Montana: neither freight- nor commuter-dominated.

By truck concentration, highways here trail 67% of counties in Montana. 78% of counties in Montana see fewer highway trucks per day than Yellowstone's roughly 916.

non-highway traffic icon

Non-highway Traffic in Yellowstone County, Montana

Trafficvehicles per day6,441
Trucks4.9%
Average travel time34.3 min
Congestion ratio15.9%
Drivers’ average age46.0 yrs
Drivers’ average income$79,599

A little more than half of the driving in Yellowstone County, Montana happens on local roads: 56% of all vehicle-miles. The average non-highway road carries 6,441 vehicles per day.

Local roads also make up about 63% of the monitored road miles: 443 miles in 9,249 segments, together carrying 1,818,108 vehicle-miles traveled per day (≈664 million per year). The truck share on non-highway roads is 4.9%.

Drivers from higher-income areas than 95% of counties in Montana

The concentration of trucks on non-highway roads is 63% lower than on highways.

The non-highway congestion ratio of 15.9% is 32% higher than the state level, suggesting slower local mobility than the state average.

95% of counties in Montana see lower average driver income among trip origins than Yellowstone. 87% of counties in Montana have an older driver population than Yellowstone.

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 80% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 22% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +13% versus the annual average.
Lowest month:
January is the quietest month, with volumes -19% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Yellowstone County, Montana, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +13% in high season.

Yellowstone County vs. Montana Traffic Comparison

Of the four measures, average daily traffic per road differs most: Yellowstone County runs 54% above the Montana average. Its truck share, by contrast, is 27% below.

MetricYellowstone CountyMontana averageDifference
Traffic6,4714,202+54.0%
Truck % (Total Traffic)8.5%11.7%-27.0%
Truck % (Highway)13.2%15.0%-12.1%
Avg. Travel Time34.2 min36.2 min-5.5%

How Yellowstone County compares

Yellowstone County moves more traffic than any nearby county

Against the 4 nearest areas, Yellowstone County carries 310.6% more traffic on a typical road and moves 8.7 times the total daily travel; it has the busiest roads of the five. It is where traffic concentrates in this corner of the map - the local bottleneck, with more vehicles per road AND less room to absorb them.

Yellowstone County and the 4 nearest county-level areas by centroid distance, with the Montana average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Yellowstone County6,4718.5%3,250,72434.2 min16.0%
Musselshell County, Montana1,71210.2%84,84649.9 min5.5%
Stillwater County, Montana1,67418.6%544,51435.5 min6.6%
Golden Valley County, Montana1,46015.1%53,60861.8 min4.9%
Big Horn County, Montana1,45818.5%803,67743.0 min5.2%
Montana average4,20211.7%N/A36.2 min12.3%

Yellowstone County ranked within Montana

On average daily traffic volume and highway travel volume, Yellowstone County is among the three highest county-level areas in Montana.

Yellowstone County ranked among 56 county-level areas in Montana (1 = highest); measures without data in every county rank a smaller field, down to 47.
MeasureYellowstone CountyMontana rank
Traffic volume (AADT)6,471#2 of 56
Highway vehicle-miles per day1,432,616#3 of 47
Truck share on highways13.2%#31 of 47
Highway trucks per day916#11 of 47
Average travel time34.2 min#48 of 56
Average driver income$79,094#4 of 56
Average driver age46.0 yrs#49 of 56

Yellowstone County ranks #2 of 56 on average daily traffic volume but #49 of 56 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Yellowstone County, Montana

Traffic concentrates on a few corridors: the three busiest roads average 30,028 vehicles a day, against 6,471 on the average road in Yellowstone County.

Main Street leads with 33,851 vehicles a day, 2,269 of them trucks (6.7%). I 90 carries the most trucks, 2,833 a day (11.2% of its traffic), although it ranks #3 for all traffic.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Main StreetTrunk road · 33,851vehicles2,269trucks · 6.7%
Road class
Trunk road
Congestion ratio
36.6%
Median trip time
31.1 min
Drivers’ median age
46.0 yrs
Drivers’ average income
$72,131

Travel on Main Street's busiest stretch runs 37% over free-flow time, against 16% across the county, so expect slower peak hours.

2US 87Trunk road · 30,828vehicles2,302trucks · 7.5%
Road class
Trunk road
Congestion ratio
24.8%
Median trip time
30.7 min
Drivers’ median age
46.1 yrs
Drivers’ average income
$71,877

US 87 carries 4.8 times the county average at its busiest, 2,302 of them trucks (7.5%, below the county-wide 8.5%).

3I 90Motorway · 25,405vehicles2,833trucks · 11.2%
Road class
Motorway
Congestion ratio
28.6%
Median trip time
32.6 min
Drivers’ median age
47.2 yrs
Drivers’ average income
$77,499

I 90 is one of the more congested roads here: trips take 29% longer than at free-flow speed, against 16% county-wide.

4I 90 Business / US 87Trunk road · 23,604vehicles1,829trucks · 7.8%
Road class
Trunk road
Congestion ratio
26.3%
Median trip time
28.1 min
Drivers’ median age
45.6 yrs
Drivers’ average income
$74,270

I 90 Business / US 87 carries 3.6 times the county average on its busiest stretch, where the median trip lasts 28.1 minutes.

5Laurel RoadPrimary road · 21,502vehicles1,200trucks · 5.6%
Road class
Primary road
Congestion ratio
24.1%
Median trip time
33.4 min
Drivers’ median age
45.8 yrs
Drivers’ average income
$69,618

At 3.3 times the county average, Laurel Road draws drivers from neighborhoods averaging $69,618 in household income.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 90Motorway · #3 by traffic25,405vehicles2,833trucks · 11.2%
2US 87Trunk road · #2 by traffic30,828vehicles2,302trucks · 7.5%
3Main StreetTrunk road · #1 by traffic33,851vehicles2,269trucks · 6.7%
4I 90 Business / US 87Trunk road · #4 by traffic23,604vehicles1,829trucks · 7.8%
5Laurel RoadPrimary road · #5 by traffic21,502vehicles1,200trucks · 5.6%
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

YellowstoneDepartment 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 Yellowstone County

The same traffic breakdown for the areas closest to Yellowstone County, Montana.

Need segment-level traffic data?

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