Interstate 5/Washington: route guide

I-5 runs north–south through western Washington, from the Oregon border at Vancouver to the Canadian border at Blaine. It follows the Puget Sound lowland, passing Olympia, Tacoma, Seattle, Everett and Bellingham.

The corridor is one continuous freeway with no tolls in Washington. Exits are numbered by milepost from the Oregon line, so Exit 1A is Vancouver and Exit 276 is Blaine. Rest areas are marked with blue signs rather than green and carry no exit numbers.

The southern stretch from Vancouver to Olympia is the quietest and most rural. Vancouver itself is the oldest permanent settlement in the Pacific Northwest and the fourth-largest city in Washington — not to be confused with Vancouver, BC. Exits 1A–7 serve the city; Exit 1C leads to Fort Vancouver and the old military base. From Exit 21 at Woodland, SR-503 runs east toward Cougar and the south side of Mount St. Helens, a useful approach from Portland.

Between Olympia and Everett the freeway turns urban and slow. Tacoma and Seattle are the pinch points, and the stretch through downtown Seattle is the worst of it. Allow an extra hour at peak times. Everett marks the northern edge of the built-up corridor.

North of Everett the road opens up again through Skagit Valley farmland to Bellingham and the border. Mount Vernon and Bellingham are the natural overnight stops if you are breaking the drive. Blaine is the last exit before Canada.

May to October is the window for the Mount St. Helens side trips and the most reliable dry roads. Summer also brings the heaviest traffic, especially Friday afternoons northbound out of Seattle and Sunday evenings southbound back into it.

Winter is wet and grey along the whole corridor, with occasional snow near the higher passes east of the route. The freeway itself rarely closes, but ice and standing water slow things down. If your goal is the mountain, check access roads before committing — some stay closed into late spring.

For a one-night break, Centralia or Olympia splits the southern half well, and Bellingham or Mount Vernon covers the north. Seattle and Tacoma have the widest choice but the highest prices and the worst parking.

Vancouver and the Hazel Dell area around Exit 4 have clusters of motels, fuel and food right off the freeway. Woodland at Exit 21 has a smaller set of motels and groceries, handy if you are heading for Mount St. Helens. Book ahead in summer and on event weekends in Seattle.

Check the Washington State Department of Transportation travel alerts before you leave — the corridor has regular overnight lane closures and weekend construction. Carry water and a full tank; the rural southern stretch has long gaps between services.

If you are crossing into Canada at Blaine, have your passport or visa ready and expect queues at peak times. For the Mount St. Helens detours, check whether Forest Roads are open and whether you need a permit for the Johnston Ridge area.