You must be:
Registering to vote for 17-year-olds:
To pre-register to vote at 17-years-old in Minnesota, you must be at least 18-years-old when the next election occurs (special, township, state primary, or state general).
Because special elections can be called at unexpected times, your application may be returned if an election becomes scheduled in between the date you register and your birthday. If that happens, simply wait until that election passes, and register again.