I have a tenent leving in an condo and his lease expering end of May, when is the last day to infrom him that I am not going to renew his lease?

I have a tenent leving in an condo and his lease expering end of May, when is the last day to infrom him that I am not going to renew his lease?
this should be in the lease, its 30 or 60 days depends on what state you are in.

You should look at the lease and see what it says about notice that is required to not renew the lease.