Where does late autumn begin?

Does the subject want to ask "where does late autumn begin?" Late autumn after cold dew refers to the day near winter when autumn is coming to an end, also called late autumn, which refers to the third month of autumn. From the cold dew to beginning of winter, the first frost is a solar term. Since then, the temperature has not been high, and cold waves often strike. Every time there is strong wind or precipitation, the temperature will drop.