Students and staff at Pouce Coupe Elementary were evacuated to the town hall Tuesday.
A cooking incident caused a plume of smoke that set off the school's fire alarm, School District 59 spokesperson Candy Clouthier said.
"Someone had left something on the stove and it was just really smoke - there was no fire," Clouthier said. "The smoke without throughout the school."
Clouthier added that buses are going out to the school as normal as of around 2 p.m.
"We're running buses as usual, students are going home as they usually would."
The school will be open Wednesday.