Winter Storm Warning: Sierra Passes Likely Closed Saturday as 2–4 Feet of Snow Slows Travel

Just as spring was knocking, the Sierra Nevada is slamming back with a winter storm that could drop two to four feet of snow at higher elevations by Saturday. Chains might become mandatory, passes could close, and what seemed like a late-season reprieve will feel like depths of midwinter—if this forecast holds.

Storm Timing & Snow Totals

Forecasters say the biggest hit begins Friday night above 4,500 feet on the west slope of the northern Sierra—especially along Interstate 80 and Highway 50. That sets the stage for a Saturday through Sunday onslaught, with some places expected to collect 24 to 48 inches of snow by sunset.

At resorts like Kirkwood, totals could reach close to three feet, while Lake Tahoe’s communities may see a foot or more. Snow levels are projected to drop from around 7,000 feet down to 4,000–5,000 feet by late Saturday—meaning even lower-elevation roads and foothills could get slick and wintry.

Roads, Passes & Travel Impacts

Mountain passes including Donner Summit and Echo Summit are at high risk of closure. With visibility slashed by heavy snowfall and winds gusting toward 80–90 mph near ridge lines, all travel over passes late Saturday is expected to be extremely difficult or impossible.

Caltrans and the California Highway Patrol are warning drivers that chains will likely be required, and delays or full shutdowns could be implemented across I-80, Highway 50, and other high mountain thoroughfares if snow overwhelms plows and maintenance crews.

Sacramento Valley & San Francisco Bay Area Effects

Down in the valley, the storm won’t be nearly as brutal—but it won’t be benign, either. Expect widespread rain Friday into Saturday with thunderstorms possible, especially in Sacramento’s foothills. Breezy winds and cooler temperatures will follow as the snow level drops, although accumulating snow in the valley itself remains unlikely.

Air travel, especially for smaller regional airports or flights bound for mountain destinations, could face delays. There’s also a chance of snow flurries in portions of the foothills, especially above 2,000–3,000 feet.

What’s Behind the Weather?

This storm stems from a potent mix of moisture drawn in by a low-pressure system over the Pacific and reinforced by a cold front pushing south from Alaska. That combo is what’s driving both the heavy snow totals at high elevation and the aggressive drop in snow level by late Saturday.

It’s also a late-season boost for a snowpack that has suffered from a record-breaking March heat wave. While April storms won’t bring the snowpack fully back to normal, this weekend’s event could help close the gap in many of the Sierra’s basins.

What You Should Do

• Don’t travel over passes Saturday if you can avoid it. If you must, carry chains, check closures, and expect delays.
• Stay weather-aware: forecasts can shift. Snowfall rates may top 1–2 inches per hour during peak activity Saturday afternoon through Sunday morning.
• Prepare for power disruptions: heavy, wet snow and strong winds increase risk to power lines, especially above 5,000 feet.
• Plan ahead if you’re going skiing, snowboarding, or heading up for recreation—it may be snowed in.

While the Sierra braces for its snowiest event in weeks, valleys and cities prepare for cold, wind, and rain. It’s a dramatic push of winter at the edge of spring.

By early Sunday, heavier snowfall begins to taper off and skies should begin to clear—but roads will still require patience and caution.