Tioga, Sonora, Ebbetts: The Passes That Shut Until Spring

Chain controls slow you down. A seasonal closure ends the conversation. Each winter Caltrans gates off a handful of high crossings and stops plowing them, and they stay shut until crews can clear the snow and repair the road in spring. If your route depends on one of them, no chain level gets you through. Only a different route does.

Which crossings close, and when

Caltrans publishes its closure history on the winter driving page. Here is the recent record for the crossings Northern and Central California drivers ask about most:

For the 2025–26 season the same page lists Tioga closing on December 19, Sonora on December 25 and Ebbetts on December 26. Two things jump out of the table. The dates are not a calendar: Tioga's reopening alone has ranged from late May to late July in three seasons. And a pass can close while the valley floor is still dry, because what decides it is the snow up high, not the weather in Modesto or Sacramento.

The GPS trap

Routing apps are good at traffic and much less dependable about gates. In the shoulder seasons an app can still offer a closed pass as the quickest way from the valley to the Eastern Sierra or Nevada, and the first real warning may be a locked gate a long way up a dead-end road with no signal. Treat any route over 108, 120, 4 or 89 between late fall and late spring as unconfirmed until you have checked Caltrans QuickMap, and decide which year-round crossing you will use instead before you leave the house.

The opposite mistake catches people too. A pass that reopened last week is not the road you drove in August. Expect rockfall, broken pavement and snowmelt running across the lanes for a while after opening day, and give the first weekends extra time.

Why going around the gate is a bad idea twice over

Closed means no plowing, no regular patrols and no quick help. People who slip past barricades on snow, on foot or in a high-clearance truck are betting that nothing goes wrong in the one place where rescue is slowest.

It is a poor insurance bet as well. Whether a policy responds the same way on a closed road is a question for your own policy wording, but the practical problem arrives first: roadside assistance programs set their own limits on where a truck will go, and a tow or winch-out from an unplowed, closed highway may fall outside them. A recovery bill that nobody covers, on top of whatever happened to the car, is the predictable result.

Planning a shoulder-season crossing

1. Check twice. Look at QuickMap the night before and again before you start the climb. Caltrans' winter page also lists its highway information phone line.
2. Work out the long way in advance. Know the open crossing, how many hours it adds, and where you will buy fuel on it.
3. Carry chains anyway. The year-round routes have chain controls, and under an R-2 control even four-wheel and all-wheel drive vehicles must carry traction devices, according to Caltrans.
4. Tell someone your route when you cross a pass that has just reopened or is about to close.

What the coverage questions really are

Seasonal closures do not change your premium; where the car is garaged does. What they change is how far from help you might end up. That is where roadside assistance terms matter, meaning how far a program will tow and what it charges past that point. It is also where comprehensive matters, because a rock-dented roof or a branch through the windshield on a freshly opened pass is commonly treated as a comprehensive claim rather than a collision one. Check your own policy for both, and if your declarations page leaves you guessing, you can have your coverage looked over in a couple of minutes before the next trip over the hill.