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Traffic heat map of Stillwater County, Montana: 179 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 90 and Pike Avenue

Stillwater County, Montana Traffic Counts

How busy are the roads of Stillwater County, Montana? We measure 179 road miles, divided into 1,149 segments, with multi-sourced, cross-verified mobile and sensor data. Its highways rank among the top 3 counties in Montana for trucks per day. 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
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Total Traffic Volume & Performance in Stillwater County, Montana

Traffic

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

vehicles per day1,674
Trucks

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

18.6%
Average travel time

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

35.5 min
Congestion ratio

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

6.6%
Drivers’ average age

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

49.9 yrs
Drivers’ average income

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

$80,282

A typical monitored road in Stillwater County, Montana sees 1,674 vehicles per day, while its 179 miles of monitored roads together handle 544,514 vehicle-miles traveled per day (≈199 million per year). Freight weighs heavily here: trucks are 18.6% of traffic, against 11.7% across Montana.

Traffic 60% below the Montana average

Stillwater sees 60% lower average daily traffic volume than the state average (1,674 vehicles per day against 4,202), suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. In total volume terms, its road network carries about 1.9% of Montana's statewide total of vehicle-miles. Stillwater carries less traffic than 53% of counties in Montana.

Journey times here (35.5 minutes on average) closely track the state level. 78% of counties in Montana have a longer average travel time than Stillwater's 35.5 minutes.

Congestion runs 46% lower than the state level, at a ratio of 6.6%, which means smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Stillwater County, Montana

Trafficvehicles per day5,264
Trucks20.6%
Average travel time49.0 min
Congestion ratio13.0%
Drivers’ average age48.5 yrs
Drivers’ average income$77,224

The vast majority of driving in Stillwater County, Montana happens on highways: 82% of all vehicle-miles. The average highway carries 5,264 vehicles per day, 295% more than the average non-highway road in the same area, which carries 1,332 vehicles per day.

With 43% of the road miles (77 miles in 100 segments), highways punch above their length, carrying 448,279 vehicle-miles traveled per day (≈164 million per year).

70% of counties in Montana move less traffic on their highways.

More highway trucks than 96% of counties in Montana

The concentration of trucks on highways (20.6%) is 38% higher than the state average for similar road classifications. Highways here lean toward freight, so highway access is a real asset for logistics operators.

88% of counties in Montana see a lower highway truck share than Stillwater's 20.6%. By raw truck volume, Stillwater carries more highway trucks than 96% of counties in Montana.

non-highway traffic icon

Non-highway Traffic in Stillwater County, Montana

Trafficvehicles per day1,332
Trucks8.9%
Average travel time34.2 min
Congestion ratio6.0%
Drivers’ average age53.1 yrs
Drivers’ average income$88,443

Local roads carry a smaller share of travel in Stillwater County, Montana, 18% of vehicle-miles; most driving happens on highways. A typical local road sees 1,332 vehicles per day.

Spread over 102 miles and 1,049 segments, 57% of the road network, local roads carry a lighter load per mile: 96,235 vehicle-miles traveled per day (≈35.1 million per year). About 1 in 11 vehicles on non-highway roads is a truck (8.9%).

Drivers from higher-income areas than 96% of counties in Montana

The concentration of trucks on non-highway roads is 57% lower than on highways.

Non-highway congestion (6.0%) runs 51% lower than the state average, pointing to smoother local traffic flow.

96% of counties in Montana see lower average driver income among trip origins than Stillwater. Stillwater's median driver age is lower than 60% of counties in Montana.

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 94% higher than the daily average.
Weekend traffic:
Weekend traffic is about as busy as on weekdays (+1%): leisure and through trips largely replace the commute.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +26% versus the annual average.
Lowest month:
January is the quietest month, with volumes -26% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Stillwater County, Montana, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +26% in high season.

Stillwater County vs. Montana Traffic Comparison

Stillwater County's biggest difference from the Montana average is its average daily traffic per road, 60% below it. Its truck share, by contrast, is 59% above.

MetricStillwater CountyMontana averageDifference
Traffic1,6744,202-60.2%
Truck % (Total Traffic)18.6%11.7%+59.2%
Truck % (Highway)20.6%15.0%+37.9%
Avg. Travel Time35.5 min36.2 min-1.9%

How Stillwater County compares

Stillwater County against nearby counties

Set against the average of the 4 areas nearest to it, Stillwater County carries 43.8% less traffic on a typical road and sees 20.5% shorter typical trips; it has the fourth busiest roads of the five. Freight passes through here that never reaches the areas around it: the truck share is high precisely because the local car traffic is not.

Stillwater 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
Stillwater County1,67418.6%544,51435.5 min6.6%
Carbon County, Montana2,3079.5%404,05738.9 min6.6%
Sweet Grass County, Montana1,67520.8%510,31543.6 min6.1%
Yellowstone County, Montana6,4718.5%3,250,72434.2 min16.0%
Golden Valley County, Montana1,46015.1%53,60861.8 min4.9%
Montana average4,20211.7%N/A36.2 min12.3%

Stillwater County ranked within Montana

On highway truck volume and average driver income, Stillwater County is among the three highest county-level areas in Montana.

Stillwater County ranked among 56 county-level areas in Montana (1 = highest); measures without data in every county rank a smaller field, down to 47.
MeasureStillwater CountyMontana rank
Traffic volume (AADT)1,674#30 of 56
Highway vehicle-miles per day448,279#15 of 47
Truck share on highways20.6%#6 of 47
Highway trucks per day1,087#3 of 47
Average travel time35.5 min#44 of 56
Average driver income$80,282#3 of 56
Average driver age49.9 yrs#34 of 56

Stillwater County ranks #3 of 56 on average driver income but #44 of 56 on average travel time - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Stillwater County, Montana

On their busiest stretches, the three busiest roads in Stillwater County carry 6,987 vehicles a day on average, 4.2 times the typical road in the county (1,674).

I 90 is the busiest road, at 11,699 vehicles a day, 2,415 of them trucks (20.6%). That is 2.4 times the next road, Pike Avenue (4,964). It tops the truck ranking too, with the most trucks.

I 90 carries longer journeys than most roads here, with a median trip of 48.5 minutes against 35.5 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 90Motorway · 11,699vehicles2,415trucks · 20.6%
Road class
Motorway
Congestion ratio
13.0%
Median trip time
48.5 min
Drivers’ median age
48.5 yrs
Drivers’ average income
$77,225

A main artery: I 90's busiest stretch carries 7.0 times the county average; trucks are 20.6% of it, above the county-wide 18.6%.

2Pike AvenuePrimary road · 4,964vehicles480trucks · 9.7%
Road class
Primary road
Congestion ratio
16.5%
Median trip time
36.0 min
Drivers’ median age
51.6 yrs
Drivers’ average income
$81,187

Travel on Pike Avenue's busiest stretch runs 17% over free-flow time, against 7% across the county, so expect slower peak hours.

3MT 78Primary road · 4,299vehicles500trucks · 11.6%
Road class
Primary road
Congestion ratio
11.3%
Median trip time
44.9 min
Drivers’ median age
49.2 yrs
Drivers’ average income
$77,496

On its busiest stretch, MT 78 carries 2.6 times the county average; trucks are 11.6% of it, below the county-wide 18.6%.

49th StreetPrimary road · 4,165vehicles414trucks · 9.9%
Road class
Primary road
Congestion ratio
12.2%
Median trip time
38.7 min
Drivers’ median age
50.5 yrs
Drivers’ average income
$76,035

9th Street peaks at 4,165 vehicles a day, 2.5 times the county average; trucks are 9.9% of it, below the county-wide 18.6%.

5Woodard AvenuePrimary road · 2,531vehicles499trucks · 19.7%
Road class
Primary road
Median trip time
36.0 min
Drivers’ median age
54.7 yrs
Drivers’ average income
$78,302

Woodard Avenue is busy by local standards, at 51% more than the county average on its busiest stretch; trucks are 19.7% of it, above the county-wide 18.6%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 90Motorway · #1 by traffic11,699vehicles2,415trucks · 20.6%
2MT 78Primary road · #3 by traffic4,299vehicles500trucks · 11.6%
3Woodard AvenuePrimary road · #5 by traffic2,531vehicles499trucks · 19.7%
4Pike AvenuePrimary road · #2 by traffic4,964vehicles480trucks · 9.7%
59th StreetPrimary road · #4 by traffic4,165vehicles414trucks · 9.9%
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

StillwaterDepartment 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 Stillwater County

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

Need segment-level traffic data?

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