Live answer for I-5 over the Siskiyous on both sides of the Oregon-California line: Caltrans chain controls on the California side and ODOT’s Siskiyou Summit report on the Oregon side, refreshed every few minutes.
No chain controls or closures right now on I-5, as of 11:17 pm Pacific. Carry chains in winter; controls can go up within minutes in a storm.
Live roads, cams and lots
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Before you go
Siskiyou Summit is the highest point on I-5 and the first place it snows. Oregon and California post chain rules differently, so read both. I-5 Siskiyou Pass cams and weather.
Oregon works differently from California: ODOT posts “carry chains or traction tires” all winter as a standing advisory. It only matters when signs say chains are required, sometimes with traction tires allowed on vehicles under 10,000 lbs. Oregon, California, Washington and Nevada chain laws · How to put on chains.
What the levels mean: R-1 means chains are required unless you have snow tires; R-2 means chains are required on everything except 4WD/AWD vehicles with snow tires on all four wheels (and those must still carry chains); R-3 means chains on all vehicles, no exceptions. Full R-1, R-2, R-3 explainer · How to put on chains.
Lots, cams and crowd calendar by resort: Mt. Ashland · Mt. Shasta Ski Park.