What is the timeline for hiring tenure-track Professors during the Summer? I'm curious to know if anyone has any experience with conducting a tenure-track job search during the summer for positions in the US.  I've noticed jobs posted from late May through early July.  What's the timeline for hiring decisions this late in the cycle?  Should I expect a typical interview / campus interview / offer process?  How late are these decisions typically made?  If I applied for a position in early June but haven't heard anything by early July, should I assume the position is closed?

I'm looking for positions within English departments at four year teaching institutions and HBCUs, pretty exclusively.  Thanks so much!
In my academic circles, it is essentially verboten to do tenure-track hiring over the summer.  (One cannot count on having a quorum of faculty members in-town, and those who are around probably have other plans.)  You might get better advice by specifying your field and the kind of institution you've applied to (e.g. research university, four year college).  

I just saw @aeismail's answer: yes, I think that summer tenure track hiring is likely to be a kind of "Plan B," or alternatively comes from an administrative initiative rather than the departmental level.  (In my experience, upper university administration can be surprisingly out of step with faculty hiring timelines.)  But to me this kind of hiring feels "exceptional," and some of the standard hiring practices may be abridged or otherwise bent.

As a general rule, I would not assume an academic position is closed until they tell you.  If you are still interested in the job, send a short email to the chair of the hiring committee.  She will tell you whether the position is still open.  You should know however that sometimes "the position is still open" means that they conducted their search, interviewed their candidates, and found a candidate that has indicated willingness to accept but hasn't filled out the paperwork yet.  You should certainly be pursuing other options, and you should be aware that in almost any academic field, there will be many more hiring opportunities available during the academic year.