The United States had its most lethal avalanche week in more than a century, when 15 people died in natural disasters last week.
The deadline from January 30 to February 6 was the worst since 1910, according to the Colorado Avalanche Information Center.
It included avalanches in Utah, Colorado, Montana, California, Alaska and New Hampshire.
“This has been a difficult week for many people in our community, in Colorado and across the country,” the center said in a Facebook post announcing the dark milestone.
Multiple fatalities were caused by unique avalanches in Utah, Alaska and Colorado.
The most recent in Utah killed four skiers in Millcreek Canyon on Saturday. Four other skiers survived the ordeal.
Three inland skiers died in an avalanche on February 1 in the mountains of San Juan, Colorado.
Four people were initially arrested, but others in the group managed to free a skier, who had minor injuries, officials said.