Clearance + restrictionCited official sources
I-90 Snoqualmie Pass — Washington
Seattle's mountain interstate. 6% grades. Winter chain country.
Interstate 90 east of Seattle crosses Snoqualmie Pass (3,022 ft). The route is the primary Seattle-to-Spokane corridor and one of the busiest mountain interstates in the Northwest. Winter operations include WSDOT chain requirements during snow events. RV-friendly throughout.
Frame: a highway in Washington — not this route.
- Tier
- Clearance + restriction
- State
- Washington
- Sources
- Cited official (.gov / .org)
Practical winter advice
WSDOT operates chain-up areas with marked turnouts. Use them rather than trying to chain up on the shoulder.
Practice chain installation in dry conditions before you need it in a blizzard. Snow chains are not intuitive.
What WSDOT doesn't tell you
WSDOT operates one of the best mountain-pass-status systems in the US. Use it.
- WSDOT mountain passes: Live status.[source]
Frequently asked questions
- Where can I buy chains?
- Multiple shops in North Bend (east of Seattle, before the climb). Don't buy at the summit.
Authoritative sources
Verify current conditions with state DOT 511 systems before departure. RV restrictions may change. Weather may close roads.
Planning an RV trip along I-90 Snoqualmie Pass?
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