If you just cancel whithout sending them anything, yes, they will charge you an early termination fee (which is probably more than what the full month would have cost you)
Some people will probably tell you:"Wait until you are there callthem and say you are in the USA, they will terminate immediatly the account since EV service is not permitted in the USA". Yes, it's true, they will terminate the account ON THE SPOT, but will charge you an early termination still
You said you are moving there for school? As soon as you know the exact moving date call EV and say you are moving out of Canada and want the fax number to send proofs that you are moving out of Canada.
Once you have the number send in you school paper and your new lease, with a cover sheet that includes you name, adress, account number (8455123456789123) and a description of situation
With that information no penalties will be applied to your account