Washington Chain Season Is Here. What Missing Chains Can Cost Your Truck Insurance
From November 1 to April 1, every truck over 10,000 pounds on Washington's mountain routes has to carry chains, snow or no snow. Troopers are already checking on Snoqualmie Pass. Here is what the rule says and why it matters for your claims and your renewal.
The rule that switched on November 1
Washington's winter chain season for commercial trucks started on November 1, 2026. CDLLife flagged the change on October 28, and CCJ ran a reminder this week that drivers are now required to carry chains on many Washington state routes. The source behind both is the Washington State Department of Transportation, which spells it out plainly. From November 1 through April 1, any vehicle over 10,000 pounds traveling the listed mountain routes must carry chains at all times, whatever the weather and whatever the signs say.
That last part is what catches people. A dry, sunny run over the pass is not an excuse. If you are on a covered route during the season and the chains are not in the truck, you are out of compliance before the first flake falls.
Troopers are checking on Snoqualmie Pass this week
The Washington State Patrol announced a two day chain enforcement emphasis on I-90 over Snoqualmie Pass for November 3 and 4, 2026, according to CDLLife's report on the WSP announcement. A WSP trooper described the goal as educating drivers and getting them to carry chains from November 1 through April 1, and troopers said they would both educate and enforce. In other words, the warning period is short. Expect the same attention on the pass all winter.
What has to be in the truck, and where
WSDOT says vehicles over 10,000 pounds must carry at least two extra tire chains. The chains have to be two sided, made with hardened metal, and not plastic, and at least one cross chain has to touch the road at all times once they are on. Cable chains can work if the State Patrol approves them as equal in performance.
The covered routes include I-90 from North Bend to Ellensburg, I-82 from Ellensburg to Selah, US 2 between Index and Dryden, US 12 from Packwood to Naches, SR 410 from Enumclaw to Naches, along with stretches of US 97, SR 14, SR 20, SR 155, SR 970 and the Mt. Baker Highway. Check the current WSDOT list before you dispatch, since it is the official word.
There is one exemption worth knowing. WSDOT says local deliveries do not need chains if the truck stays outside the chain areas and never crosses a mountain pass. And when chains are required to be installed, WSDOT or the State Patrol can stop a truck without them from going any farther.
Why a chain ticket is an insurance problem
A missing chain citation looks small. The real cost shows up later. Roadside violations land on your inspection history, and underwriters look at that history when your policy renews. A pattern of equipment and compliance violations tells a carrier you cut corners, and that can show up in your rate or in whether a market will quote you at all.
The bigger risk is a crash. If your truck spins out on a closed or chain required grade and you were not carrying chains, the other side's attorney will put that front and center. It becomes evidence that you were not ready for the road, which makes a liability claim harder to defend and more expensive to settle. That claim lands on your commercial auto liability coverage, and its size follows you into every renewal after it.
Winter claims hit more than liability
A slide into a guardrail or a jackknife on the pass also damages your own equipment. That is a physical damage claim, and with repair costs and downtime where they are, it is not a small one. If the load is damaged, spilled or sits stuck behind a closure, your motor truck cargo policy is next in line. A set of chains costs far less than any one of those deductibles.
The practical checklist is short. Put the chains on the truck before November 1 every year, count them, make sure they fit the tires you actually run, and practice a chain up somewhere safe before you need it on a shoulder in the dark. Write chain checks into your pre trip routine for any load routed over the Cascades.
Get your winter coverage checked
If you run Washington or any mountain lane this winter, now is a good time to confirm your liability limit, your physical damage values and your cargo limit all match the freight you haul. Get a truck insurance quote in under a minute right here, or call or text 423-264-4255 and we will shop it for you. Curious what drives your rate? Read how much commercial truck insurance costs.
Common questions
When do Washington's chain rules for trucks apply?
WSDOT says vehicles over 10,000 pounds must carry chains at all times on the listed mountain routes from November 1 through April 1, no matter the weather. From April 2 through October 31, chains are only required where posted.
How many chains does a truck need to carry in Washington?
At least two extra tire chains, according to WSDOT. They must be two sided, made with hardened metal, and not plastic.
Do local delivery trucks need chains?
WSDOT says local deliveries are exempt if the truck stays outside the chain required areas and does not cross a mountain pass.
Can a chain violation affect my truck insurance?
It can. Inspection violations show up in your safety history, which underwriters review at renewal, and missing chains in a winter crash can make a liability claim harder to defend. To get a truck insurance quote that fits your winter lanes, call or text 423-264-4255.
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