Lockwood School was on a modified lock-down for about three hours on Wednesday after a nearby resident reported a home invasion.
A resident who lives in the 100 block of Hemlock Drive said a man entered the home at about 5:30 a.m., Sheriff Mike Linder said.
When confronted, the intruder ran from the home.
No one was physically harmed during the incident, but sheriff's deputies are looking for the would-be burglar, Linder said.
Lockwood School was notified, and Superintendent Tobin Novasio said they took precautions.
The modified lock-down meant students were not allowed to move between the school buildings.
"We went into it about 8:15, once we were notified of the situation, and we came out between 11 and 12," Novasio said.
The man is described as an adult male in his 20s or 30s. He has short brown hair, a short beard and mustache and was wearing round or oval-shaped glasses.
The intruder was wearing a gray Carhartt-type work jacket and blue jeans.
"Lock doors, make sure to be vigilant and take all safety precautions," Linder said.