"They are a propaganda exercise by local authorities," said Mick Aldridge, chief executive of the PFRA. "We will ignore them."
The advice, to be issued later this month, will say that county-wide no cold calling zones cannot be legally enforced. It is based on the summary of a legal opinion commissioned by the Office of Fair Trading.
The summary says that it is legal for local authorities to set up no cold calling zones and to try to enforce them, but that they do not actually have any powers to do so.
"Entering a no cold calling zone is not a crime," said Aldridge. "An individual householder could in theory sue a caller for trespassing but that's obviously not going to happen."
The PFRA will ask members to respect zones that have been set up in response to rogue traders or distraction burglaries.
An OFT spokesman said worried fundraisers should seek their own legal advice.