The teen suspect, who cannot be identified, is accused of calling the sheriff's office in Polk County, Fla., in Sept. 2014 and saying he would "drive to Fort Meade High School in a black van and shoot everyone."
The threat, known as "swatting," was a hoax intended to get a law enforcement SWAT team to respond to the school, according to the Polk Sheriff's Office.
Police quickly responded, placing the school on lockdown, and spent several hours searching for an armed suspect.
Police say the teen told a girl in Fort Meade he was going to "swat" her school, over email, prior to the call.
He's accused of making similar threats to the same school in October 2014, saying he would "blow everyone up."
In November 2014, police say he pulled the same hoax on the girl's home in Winter Haven, Fla., east of Tampa.
RCMP searched the teen's home on Saturday, based on information provided Florida police.
He is scheduled to appear in court this week.