Idaho Ski Roads & Weather: Mountain Passes

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Idaho weather radar

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The last two hours of the National Weather Service radar. Pins show the temperature at each ski area; tap one for its forecast.

Idaho chain laws, in plain English

Idaho has no traction law for passenger cars: nothing requires you to carry chains or run winter tires. The chain-up law covers commercial vehicles over 26,000 lbs on I-90 over Lookout and Fourth of July passes and US-12 over Lolo Pass, when the signs are on. Studded tires are allowed October 1 to April 30. Good winter tires still matter on SH-21, SH-55 and SH-75.

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Mountain passes

Pavement, air temperature and wind from ITD’s weather stations on Idaho’s mountain passes and grades, with the nearest camera. The passes on the way to the ski areas are first.

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Where this comes from. Closures, roadwork, message signs, weather station readings and camera images come from Idaho 511, the Idaho Transportation Department’s traveler service, refreshed every few minutes. Idaho 511 does not publish its plowed, snow-covered or icy road reports as live data, so the pavement readings here come from ITD’s roadside weather stations. ITD publishes it automatically and cannot guarantee it is accurate or current. Always check before you go and drive for the conditions you see. Useful links:

Idaho 511 travel map, with ITD’s road condition reports, or call 511 from inside Idaho
Traction Law Checker, to see what Idaho and the states next door require of your car
ITD: what you need to know about the chain up law
Sawtooth Avalanche Center (Sun Valley and Galena Summit), Payette Avalanche Center (McCall) and Idaho Panhandle Avalanche Center
Ski Country Roads & Weather, our dashboard for every state we cover, with snow forecasts