I think you will find this interesting.
A Prairie Falcon (presumably the same bird) has wintered at Mud Level Rd
in Cumberland County PA, near Shippensburg & Chambersburg, annually from
at least 2008 through last winter 2013. First reports of a Prairie Falcon
at this location date to 2005 but annual sightings have been since 2008.
The record has been accepted by the PA Records Committee.
I have not heard nor do I see any reports on ebird of the falcon this
It will be most interesting if the VT falcon ends up showing the same habit.