Depends on stats but anything after october id say is getting late.....meaning try to be complete by october, this is considering verification times and what not....and have your secondaries ready
Dependent on stats. If you have equivalent to 26 on the new MCAT and at least a 3.4 GPA, then you will be fine even in late September (mid-October might be late). However, if you have a < 25 on the new MCAT and < 3.2 GPA, then anything beyond early August is late.
I know two people who had ~3.4/3.5 GPA with a 27/28 respectively MCAT who applied in November and got in. I cant remember how many schools 1 of them applied to but they got in somewhere. The other applied to 6 DO and got into one before accepting their MD acceptance. This is not advised however but its not a death sentence.