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Traffic heat map of Grant County, Washington: 1,036 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Stratford Road

Grant County, Washington Traffic Counts

TrafficZoom tracks traffic on 1,036 road miles in Grant County, Washington, divided into 6,664 segments averaging 821 ft. Its highways carry one of the top 5 truck shares of any county in Washington. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 Grant County, Washington

Traffic

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

vehicles per day3,497
Trucks

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

11.5%
Average travel time

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

33.8 min
Congestion ratio

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

11.2%
Drivers’ average age

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

43.5 yrs
Drivers’ average income

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

$75,800

Our data shows 3,497 vehicles per day on the average road in Grant County, Washington, and 3,043,381 vehicle-miles traveled per day (≈1.1 billion per year) across its 1,036 miles of monitored roads. Freight weighs heavily here: trucks are 11.5% of traffic, against 7.1% across Washington.

Traffic 52% below the Washington average

Grant sees 52% lower average daily traffic volume than the state average (3,497 vehicles per day against 7,322), suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. Network-wide, Grant accounts for about 2.0% of Washington's statewide total of vehicle-miles. Grant carries more traffic than 50% of counties in Washington.

The average trip takes 33.8 minutes, on par with the state level. On travel time, Grant runs longer than 50% of counties in Washington.

Congestion runs 44% lower than the state level, at a ratio of 11.2%, which means smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Grant County, Washington

Trafficvehicles per day8,987
Trucks16.0%
Average travel time44.0 min
Congestion ratio20.7%
Drivers’ average age44.0 yrs
Drivers’ average income$80,462

A significant share of driving in Grant County, Washington, 44% of vehicle-miles, happens on highways. The average highway carries 8,987 vehicles per day, 187% more than the average non-highway road in the same area, which carries 3,133 vehicles per day.

Highways make up 15% of the monitored road miles (160 miles, 415 segments), so they carry more than their share: 1,348,611 vehicle-miles traveled per day (≈492 million per year).

56% of counties in Washington move less traffic on their highways.

Higher highway truck share than 88% of counties in Washington

At 16.0%, highway truck share is 68% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

By truck concentration, highways here outrank 88% of counties in Washington. By raw truck volume, Grant carries more highway trucks than 59% of counties in Washington.

non-highway traffic icon

Non-highway Traffic in Grant County, Washington

Trafficvehicles per day3,133
Trucks8.0%
Average travel time33.2 min
Congestion ratio10.5%
Drivers’ average age43.4 yrs
Drivers’ average income$73,889

Local roads carry more than half of all travel in Grant County, Washington (56% of vehicle-miles). A typical local road sees 3,133 vehicles per day.

Local roads make up 85% of the monitored road miles (875 miles in 6,249 segments) but carry less than their share of travel: 1,694,769 vehicle-miles traveled per day (≈619 million per year). Trucks make up 8.0% of non-highway traffic, about 1 in 13 vehicles.

Younger drivers than 82% of counties in Washington

Non-highway roads carry a truck concentration that's 50% lower than the highway network.

The non-highway congestion ratio of 10.5% is 46% lower than the state level, suggesting more efficient local mobility than the state average.

Grant's average driver income is lower than 58% of counties in Washington. Grant's median driver age is lower than 82% of counties in Washington.

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 8:00 PM, with volumes reaching approximately 75% higher than the daily average.
Weekend traffic:
Weekend traffic is about as busy as on weekdays (+3%): leisure and through trips largely replace the commute.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +27% versus the annual average.
Lowest month:
January is the quietest month, with volumes -33% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Grant County, Washington, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +27% in high season.

Grant County vs. Washington Traffic Comparison

Grant County's biggest difference from the Washington average is its highway truck share, 68% above it. Its truck share is also 62% above.

MetricGrant CountyWashington averageDifference
Traffic3,4977,322-52.2%
Truck % (Total Traffic)11.5%7.1%+61.5%
Truck % (Highway)16.0%9.5%+67.8%
Avg. Travel Time33.8 min33.2 min+2.0%

How Grant County compares

Grant County against nearby counties

Nothing in this table sets Grant County sharply apart from the 4 areas nearest to it, though it has the third busiest roads of the five. The same kind of road, simply more of it: traffic per road matches the areas around it while the network itself is larger.

Grant County and the 4 nearest county-level areas by centroid distance, with the Washington average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Grant County3,49711.5%3,043,38133.8 min11.2%
Douglas County, Washington4,5527.8%1,068,26532.7 min14.6%
Adams County, Washington2,52317.6%1,620,37040.1 min7.6%
Lincoln County, Washington1,38114.4%715,27147.6 min7.2%
Kittitas County, Washington3,71116.3%3,473,82334.5 min13.7%
Washington average7,3227.1%N/A33.2 min19.9%

Grant County ranked within Washington

Truck share on highways places Grant County #5 of 33 in Washington - the top quarter of the state.

Grant County ranked among 39 county-level areas in Washington (1 = highest); measures without data in every county rank a smaller field, down to 33.
MeasureGrant CountyWashington rank
Traffic volume (AADT)3,497#20 of 39
Highway vehicle-miles per day1,348,611#15 of 33
Truck share on highways16.0%#5 of 33
Highway trucks per day1,434#14 of 33
Average travel time33.8 min#20 of 39
Average driver income$75,800#23 of 39
Average driver age43.5 yrs#32 of 39

The two ends of this table sit far apart: #5 of 33 on truck share on highways, against #32 of 39 on average driver age.

Busiest roads in Grant County, Washington

Traffic concentrates on a few corridors: the three busiest roads average 22,443 vehicles a day, against 3,497 on the average road in Grant County.

Stratford Road is the busiest road, at 29,405 vehicles a day, 1,354 of them trucks (4.6%). No other road comes close: Coulee Corridor, in second place, carries 19,567. I 90 carries the most trucks, 2,839 a day (17.8% of its traffic), although it ranks #5 for all traffic.

Trips using I 90 are long: a median of 57.3 minutes against 33.8 county-wide, the mark of a through route.

Broadway Avenue is busy with cars rather than freight: only 3.6% of its traffic is trucks, against 11.5% county-wide.

Freight stands out on I 90: trucks are 17.8% of the traffic there, against 11.5% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Stratford RoadPrimary road · 29,405vehicles1,354trucks · 4.6%
Road class
Primary road
Congestion ratio
43.8%
Median trip time
34.7 min
Drivers’ median age
43.1 yrs
Drivers’ average income
$69,397

Travel on Stratford Road's busiest stretch runs 44% over free-flow time, against 11% across the county, so expect slower peak hours.

2Coulee CorridorTrunk road · 19,567vehicles1,303trucks · 6.7%
Road class
Trunk road
Congestion ratio
23.7%
Median trip time
31.6 min
Drivers’ median age
42.9 yrs
Drivers’ average income
$76,057

Coulee Corridor is a trunk route for the county, carrying 5.6 times the county average on its busiest stretch; trucks are 6.7% of it, below the county-wide 11.5%.

3Broadway AvenuePrimary road · 18,358vehicles664trucks · 3.6%
Road class
Primary road
Congestion ratio
20.2%
Median trip time
29.0 min
Drivers’ median age
43.3 yrs
Drivers’ average income
$76,886

Broadway Avenue carries 5.2 times the county average at its busiest, 664 of them trucks (3.6%, below the county-wide 11.5%).

4State Route 17Trunk road · 17,527vehicles1,053trucks · 6.0%
Road class
Trunk road
Congestion ratio
20.7%
Median trip time
29.2 min
Drivers’ median age
43.7 yrs
Drivers’ average income
$72,070

State Route 17 carries 5.0 times the county average on its busiest stretch, where the median trip lasts 29.2 minutes.

5I 90Motorway · 15,988vehicles2,839trucks · 17.8%
Road class
Motorway
Congestion ratio
17.9%
Median trip time
57.3 min
Drivers’ median age
45.1 yrs
Drivers’ average income
$85,514

I 90 carries 4.6 times the county average at its busiest, 2,839 of them trucks (17.8%, above the county-wide 11.5%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 90Motorway · #5 by traffic15,988vehicles2,839trucks · 17.8%
2State Route 28Trunk road · 15,413vehicles1,752trucks · 11.4%
Road class
Trunk road
Congestion ratio
30.5%
Median trip time
46.6 min
Drivers’ median age
44.5 yrs
Drivers’ average income
$81,829

State Route 28 is one of the more congested roads here: trips take 30% longer than at free-flow speed, against 11% county-wide.

3F Street SouthwestTrunk road · 13,090vehicles1,597trucks · 12.2%
Road class
Trunk road
Congestion ratio
27.3%
Median trip time
40.1 min
Drivers’ median age
43.6 yrs
Drivers’ average income
$81,200

F Street Southwest carries 3.7 times the county average on its busiest stretch, where the median trip lasts 40.1 minutes.

4Stratford RoadPrimary road · #1 by traffic29,405vehicles1,354trucks · 4.6%
5Coulee CorridorTrunk road · #2 by traffic19,567vehicles1,303trucks · 6.7%
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

GrantDepartment 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 Grant County

The same traffic breakdown for the areas closest to Grant County, Washington.

Need segment-level traffic data?

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