It appears that Hereford United will have to purchase or hire a set of frost covers for next season according to an article on the Aldershot OS.
Football League regulations have recently been updated.
This is part of Regulation 27/4:
With effect from season 2010/11, each Home club shall provide full pitch frost covers and/or under soil heating (the specification of which shall meet the reasonable satisfactiion of the Executive) which shall be operated to the extent necessary to procure, so far as it is reasonably possible, that the pitch is playable on the occasion of each match.