The Douglas County Sheriff's Office said search and rescue crews were dispatched again to the Spring Hill neighborhood around 12:30 p.m. Sunday.
Ethan Ryder was last seen wearing a red t-shirt, blue jeans and brown work boots when he left the house.
Deputies are concerned about the falling temperatures outside and say that Ethan did not take a jacket or cell phone with him when he left.
He is described as a white male, 6 ft 2 inches tall, 150 pounds with brown hair and blue eyes.
Ryder went missing on Friday night around 7:30 p.m. and was found early Saturday morning by Littleton police.
The public is encouraged to call 9-1-1 if they see anyone matching this description.
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