May? July? September? When do your leases end?

[Account Closed]

Zillow says May is the best month to sell a home (here in Portland), but what about to rent one out?  I've heard spring is best, but this summer I've also seen a lot of tenant activity.  

I'll be starting a tenant's lease September 1 and am trying to decide whether to offer a 9 month or one year lease. The local public school year ends early June and begins late August, but local colleges and universities start late September.  That said, this particular location doesn't hinge on the school district or any nearby university (in other words, most of my tenants have been post-college millennials without kids).  

How do you like to time your leases throughout the year and why? 

p.s. I used to do m2m but local laws require 90 days' notice for rent increases/non-renewals plus a hefty relocation fee if terminating a lease or m2m agreement, so there's no longer much benefit to landlords for m2m.  So this question is directed to landlords who do leases, not month to month agreements.