Firefighters say the 13-year-old was trying to hide in the top-loading machine, and was almost completely inside it when he got jammed.
His grandmother tried to free him, but couldn't get him out.
She called the fire department, and it took firefighters half an hour to get the boy out of the washer.
Firefighters say the boy wasn't injured, and the washing machine is fine too.
They say the boy was hopeful his mother wouldn't find out about the incident.