Frostville has no wall. Thus it is especially vulnerable to attacks from the Horde. Recently, however, blood red rose bushes have been appearing around the town and they have been rapidly growing and expanding around the town. It looks like that, once complete, the town will be surrounded by a thorny hedge. Citizens have been warned not to get close to the bushes as the plants will actively reach out for living creatures and suck the blood out of them. They are the same species that surround the center of the Dark Forest, and a specimen has been growing in Lady Frost's garden for some time.
Whether this is enough, and if the gaps in the hedge can be closed in time, is yet to be seen.