A Rye family is desperate to find its missing 15-year-old son, who was last seen Friday in White Plains and has not been heard from since.

Pierce Crowley, a freshman at Iona Preparatory School in New Rochelle, was last seen wearing dark jeans, a bright blue “Florida Gators” short-sleeve T-shirt, and black sneakers with lime-green trim – possibly near the White Plains Metro-North station at 16 Ferris Ave.

He has light brown hair, blue eyes and wears braces; he is 5 feet 10 inches tall and weighs 150 pounds, according to a flier seeking information on his possible whereabouts.

“As some of you may already know, our dear Pierce is missing,” his parents, Peter and Gretchen Crowley, wrote in an email to friends Sunday. “He was not feeling well before he disappeared and is in a fragile state. It is URGENT that we locate him ASAP.”

In addition to contacting police about the boy’s disappearance, his family has mobilized a massive volunteer effort with some 500 people posting fliers in Westchester, Connecticut, Manhattan and the Bronx, said family friend Peggy Dunne of Rye.

Emails have also gone out to community groups, religious institutions and youth organizations across the region.

“(Pierce) is a charming, talented, bright student and an amazing athlete,” Dunne said Sunday evening. “His family and his friends are just totally distraught about him missing.”

White Plains police said Sunday night there were no new leads on the boy’s whereabouts. Anyone with information is asked to call White Plains police at 914-422-6111.

The family also has set up an email account — findpiercecrowley@ gmail.com — where people may send tips.

There is a reward for information leading to the teen’s safe return.