While its exact first usage is debated, the term was published as early as 1948 and popularized in Anchorage, marking the "termination" of summer work when the first light snow appeared on the mountains.

The "termination" aspect came from these workers, who knew the snowfall meant their temporary jobs would soon be ending, or "terminated," for the year.

The "dust" refers to the first light snowfall on mountain peaks, which signaled the end of the summer season and the approaching winter.

While the term still carries its original meaning, it has evolved into a more general symbol for the end of summer and the start of winter, recognized by many Alaskans. It serves as an informal signal for Alaskans to prepare for winter conditions, including changes in the weather and driving requirements. Significant snowfall typically (although not always) begins around 6 weeks later.