Weather
Mt. Shasta City, CA Weather: I-5 Snow Threat Nov. 17-18
Mt. Shasta City, CA – Drivers traveling Interstate 5 through northern California could face hazardous winter conditions Tuesday night, November 17, into Wednesday, November 18, as a developing snowsto
By Lauren Beckett · 2026-11-15T15:28:16.534Z
Mt. Shasta City, CA – Drivers traveling Interstate 5 through northern California could face hazardous winter conditions Tuesday night, November 17, into Wednesday, November 18, as a developing snowstorm threatens mountain passes and potentially lower elevations near Mount Shasta City.
According to the National Weather Service in Medford, Oregon, there is a greater than 70% probability of at least 6 inches of snow in portions of northern California, especially at elevations above 4,000 feet.
Forecasters also warn that snow levels could fall near Interstate 5 around Mount Shasta City, increasing the possibility of winter travel disruptions.
I 5 Near Mount Shasta Faces Winter Weather Threat
The strongest snowfall probabilities are concentrated around higher terrain near the Mount Shasta region.
The National Weather Service forecast graphic indicates a 94% probability of exceeding 6 inches of snow near Snowman Summit along Highway 89.
Other mountain routes facing potential winter weather impacts include Sawyers Bar Road at Etna Summit, Highway 97 near Grass Lake and Highway 3 south of Callahan.
For Interstate 5 travelers, the primary concern is how far snow levels fall Tuesday night into Wednesday.
Snow reaching highway elevations could produce slippery pavement, reduced visibility and difficult driving conditions.
Wednesday Could Bring Significant Travel Impacts
The forecast highlights Wednesday, November 18, as the period when accumulating mountain snow could become particularly disruptive.
Travelers heading north or south through the Mount Shasta corridor should prepare for rapidly changing weather conditions, especially where the interstate crosses higher terrain.
Winter Storm Watches or Warnings could become necessary as forecasters gain confidence in snowfall amounts and affected elevations.
However, the supplied update does not confirm that such alerts have been issued.
Drivers should check current road conditions through Caltrans QuickMap before departing and monitor National Weather Service updates.
Those planning travel along I 5 Tuesday night or Wednesday should allow extra time and consider alternative departure windows if conditions deteriorate.