GUNNISON COUNTY, Colo. — Fall is being edged out by wintry conditions in Colorado's mountains, and a clear sign of that came on Friday with a report of the first human-triggered avalanche of the season.

The Colorado Avalanche Information Center (CAIC) said the slide occurred near Treasury Mountain in the Elk Mountains southeast of Marble. Nobody was injured. It was ranked a D1, meaning it was "relatively harmless to people" on the D-scale, which ticks up to D5 to indicate the most dangerous and destructive slides.

Colorado Avalanche Information Center

"This setup reminds us that even small early-season slides can happen on steep slopes where you find ~10 inches or more of consistent snow," CAIC wrote on social media .

Almost every fall, avalanches catch people seeking to ski or sno

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