YOSEMITE, CA – A winter storm moving through the Sierra Nevada is bringing fresh snow to the mountains and pushing snow levels down into the foothills, creating the potential for chain controls on roads leading into Yosemite National Park.

Forecasters say the system is delivering accumulating snow across higher elevations while colder air behind the storm is allowing snow to fall at progressively lower elevations. That means travelers coming from foothill communities toward Yosemite could encounter winter driving conditions earlier in their trip than usual.

Routes commonly used to access Yosemite Valley from the west — Highways 41, 140, and 120 — may all see chain requirements as snowfall continues and overnight freezing temperatures keep road surfaces slick. Officials with the National Park Service caution that restrictions can be implemented quickly during active storms or in the days immediately afterward as snow and ice persist.

Visitors can check current road conditions and chain restrictions by calling Yosemite’s road information line at 209-372-0200, then pressing 1 followed by 1 for updates.  Those wanting to do more research before they go can also visit the Yosemite National Park website.

Snow Reaching Into the Foothills

The lowering snow levels associated with this storm are expected to bring at least light accumulation to some foothill elevations, particularly overnight and during heavier showers. Even where snow does not stick for long, brief bursts of snow or slush can create hazardous driving conditions on shaded curves, bridges, and higher passes along the routes into the park.

Because of this, drivers should be prepared for winter conditions well before reaching Yosemite’s entrance stations.

Understanding Yosemite’s Chain Controls

Yosemite uses a three-tier system for chain requirements during winter storms:

• R1: Chains required unless vehicles have mud-and-snow tires. All vehicles must still carry chains.

• R2: Chains required unless vehicles have all-wheel or four-wheel drive. Chains must still be carried.

• R3: Chains required for all vehicles, with no exceptions.

  

A green R0 status indicates no restrictions, but officials stress that during an active winter pattern, conditions can change within hours.

Drivers can check their tires for the letters “M+S” on the sidewall to confirm mud-and-snow capability, but even vehicles equipped for winter travel are required to carry chains when entering Yosemite during the winter season.

Plan Ahead for Winter Travel

With storms continuing to track through the Sierra and colder nighttime temperatures expected to follow, chain requirements may remain in place even after snowfall tapers off. Travelers are encouraged to allow extra time, carry chains, monitor weather forecasts, and check conditions before leaving for Yosemite.

Officials emphasize that preparation is key: winter weather in the Sierra can shift quickly, and being equipped for chain controls can help ensure a safer trip into one of California’s most visited winter destinations.

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Yosemite Weather Alert: Snowfall Continues