Washington posts a maximum of 70 mph on select rural interstate sections such as parts of I-90 and I-82, with 60 mph typical elsewhere on freeways and state highways. City and town streets default to 25 mph, county roads to 50 mph, and school zones to 20 mph.
Washington speed limits at a glance
| Road type | Limit |
|---|---|
| Cities, towns, business districts | 25 mph (40 kph) |
| Residential / school zones | 25 mph (40 kph) |
| Rural highways | 60 mph (97 kph) |
| Interstates / freeways | 70 mph (113 kph) |
About speed limits in Washington
Washington's top posted limit is 70 mph, reached only on certain rural interstate stretches including parts of I-90 east of the Cascades and I-82. Through the Seattle, Tacoma and Spokane metros the freeway limit drops to 60 mph, and some corridors like Snoqualmie Pass use variable speed limits that change with weather and congestion. State law under RCW 46.61.400 sets base defaults of 25 mph on city streets, 50 mph on county roads and 60 mph on state highways, with higher interstate limits authorized by engineering study.
Washington has repeatedly debated raising its cap to 75 mph, and the legislature has signaled interest in higher rural-interstate limits where safe. But after a formal safety study, WSDOT, the State Patrol and the Traffic Safety Commission declined to raise the I-90 limit in eastern Washington, citing crash risk, so 70 mph remains the practical ceiling. Variable speed limit signs on mountain passes and busy urban freeways are a signature feature and are legally enforceable at whatever value is displayed.
In town the default is 25 mph on city and town streets unless posted otherwise, with residential arterials often 30 mph and school zones set at 20 mph when beacons flash or children are present. School-zone speeding carries doubled or elevated fines and is a priority for camera enforcement. County roads default to 50 mph, so limits can change sharply as a road crosses jurisdiction boundaries.
Washington leans into automated enforcement more than most states. Seattle has used fixed school-zone speed cameras since 2012 and is expanding to roughly 35 schools for the 2025-2026 year, while cities like Bellevue, Redmond and Bremerton run their own programs. Recent legislation broadened where automated speed cameras are allowed, adding school walk zones, park zones, hospital zones and work zones.
Enforcement
The Washington State Patrol enforces highways with radar and lidar, while a growing number of cities operate automated speed cameras in school zones, park zones and work zones. WSDOT also runs work-zone speed cameras that are expanding statewide.
Tolerance
There is no statutory grace margin, so officers can cite any amount over the limit, though small overages are commonly overlooked on open highway; school-zone and work-zone cameras tend to trigger only past a set threshold above the posted speed.
Speeding fines in Washington
Base speeding fines are typically in the low hundreds of dollars once fees are added and rise with the amount over the limit. School-zone and work-zone violations are doubled or elevated, with camera-detected school-zone fines commonly ranging from roughly 120 to 250 dollars depending on the city.
Frequently asked questions
What is the maximum speed limit in Washington?
The highest posted limit is 70 mph, found on some rural interstate sections such as parts of I-90 and I-82. Most urban freeways are 60 mph, and state law caps city streets at 25 mph and county roads at 50 mph by default.
Is Washington raising its speed limit to 75 mph?
There have been repeated proposals and legislative interest in 75 mph, but after a safety review WSDOT and the State Patrol declined to raise the I-90 limit in eastern Washington. As of 2026 the posted maximum remains 70 mph.
What is the residential speed limit in Washington?
City and town streets default to 25 mph unless a sign posts otherwise, with many residential arterials at 30 mph. School zones are 20 mph when beacons flash or children are present.
Does Washington use speed cameras?
Yes, extensively. Seattle and many other cities run automated speed cameras in school zones, and recent law expanded them to park, hospital and work zones. WSDOT also operates work-zone speed cameras on state highways.
City speed limits in Washington
- Seattle speed limit — city defaults, school zones, and camera enforcement.
Speed limits in nearby states
- Oregon speed limit — interstate, rural highway, and city limits.
- Idaho speed limit — interstate, rural highway, and city limits.
Related tools
- Convert MPH to KPH — convert any speed reading between units.
- Car speed test — verify your speedometer accuracy.
- Live GPS speedometer — see your actual speed in the browser.
- Stopping distance calculator — how far you need to brake from each speed.
- US speed limits overview — federal background and national patterns.