Abstract: An automatic down spout extension system including an extension spout pivotally attached to the lower end of a down spout, and a ballast container attached to the distal end of the extension spout. An insert including a number of side openings is attached at the upper end of the down spout, and a hose extends from the bottom of the insert to the ballast container. Rainwater from the rain gutter flows down the down spout and a portion of the water flows through the hose and fills the ballast container at the end of the extension spout. The weight of the water in the ballast container causes the extension spout to move to an extended working position. A spring interconnecting the extension spout and the down spout biases the extension spout in an upright storage position. A drain opening in the ballast container allows water to run out, and when the rain stops and the container empties, the spring pulls the extension spout to an upright storage position.