No matter what time of year, do not rush into the leasing process. Having to sign a lease for an apartment by October is a myth. You are or will be getting a lot of messages about the urgency of finding an apartment. There is plenty of time and a plethora of apartments to choose from. If there is another commitment that is causing uncertainty about where you will be next fall, (e.g. applying to be an RA, leaving ISU, studying abroad) then do not sign a lease. Make sure you are positive about needing to live off-campus before signing a lease!
Answer below if the following are facts (true) or myths (false).