California’s Sierra Records Third Snowiest Five-Day Stretch Since 1970

The Sierra experienced its third snowiest five-day period since 1970 from February 16 to 20, signaling a shift from an unusually dry winter stretch, according to California Governor’s Office of Emergency Services.

This heavy snowfall delivered widespread accumulation across the Sierra and provided a much-needed boost to California’s snowpack.

In a social media post, the UC Berkeley Central Sierra Snow Lab (CSSL) noted that 111 inches of snow were recorded from February 16 to 20.

This total marks the third-highest five-day snowfall on record at the lab since 1970. Only two periods rank higher: April 1982, when 118.5 inches were recorded in five days, and December 1970, which saw 113 inches, CSSL noted.

February 16-20 was the third snowiest 5-day period in the Sierra since 1970. Now, rain and wind in the @NWSSacramento forecast may combine to create hazardous conditions. Sign up for alerts, listen to local authorities and stay safe Californians!

👉https://t.co/Ut2f1F5mKZ pic.twitter.com/tJCjrLAh1i

— California Governor’s Office of Emergency Services (@Cal_OES) February 23, 2026

The heavy snowfall helped stabilize snowpack conditions in the Sierra, which had been declining earlier this season. Another winter system is expected to bring additional precipitation that could further support recovery.

The recent storm arrives at a critical point in California’s water year. On average, the Sierra snowpack supplies about 30% of the state’s water and is often described as California’s “frozen reservoir” because it stores winter precipitation and releases it slowly during spring and summer.

Acting as a natural reservoir, it helps during the warmer months, supporting agriculture, hydropower generation, urban water use, and river ecosystems.

Around the time of the New Year, the statewide snowpack stood at 89% of average after a series of atmospheric rivers boosted early-season totals. However, an unusually dry January eroded much of that progress, according to the California Department of Water Resources.

After a dry January reduced earlier gains, statewide snowpack levels remain below average for this time of year. With winter now more than halfway complete, officials say each incoming storm becomes increasingly important for long-term water supply conditions.

During its February snow survey at Phillips Station, the California Department of Water Resources recorded 23 inches of snow depth, with a snow water equivalent of 8 inches, or 46% of average for that site. Statewide measurements show snow water equivalent at 59% of average for this date, compared to 67% at this time last year.

CSSL said moderate to heavy precipitation is expected, which could make the snowpack heavier and denser and may cause rivers and streams to rise.