Hi Susan,
I asked Linda Hatch that same question yesterday.  The answer is Yes it does apply to June and May renewals.

From: Vermont Municipal Government Discussion Network [mailto:[log in to unmask]] On Behalf Of Susan Underwood
Sent: Friday, July 07, 2006 11:25 AM
To: [log in to unmask]
Subject: new car registration fees

Would someone clarify for me whether or not the new registration fees effective 7/1 apply to June and May renewals?
Susan in Newbury