The visit of Nick Griffin is part of two "national days of action" by the far right party, to take place on March 5 and 12, with events planned over both North and South Wales, the Evening Post understands.
The BNP is keeping the venue for their leader's visit under wraps, with details being sent to group organisers to inform members, in a bid to keep away "lefty rent-a-mobs", according to party officials.
BNP spokesman Simon Darby said: "Unfortunately, if we announced the venue, there would be a problem with extreme left wingers, aligned to the Labour Party, turning out to put pressure on. We have prime minister David Cameron talking about freedom of speech in Libya, but we have a problem with it much closer to home".
Nick Griffin, who is a Member of the European Parliament for north west England, lives near Welshpool in Powys, and was a BNP candidate in the 2007 Welsh Assembly elections, for the South Wales West region.
The party received 8,993 votes, 5.5 per cent of those cast, behind the Labour party's 58,347 votes 35.8 per cent. The party, which Mr Griffin has led since 1999, believes it has a chance of upsetting the odds at the next Assembly elections on May 5.
Mr Darby added: "With the Assembly elections looming, it will soon reveal we are in the frame, and will upset some of our political opponents.
"The BNP reflects the sentiments of the people of Wales, and not the phoney alternatives of Plaid Cymru and Labour."
The BNP says it wants an immediate halt to all further immigration, the immediate deportation of criminal and illegal immigrants, and the introduction of a "system of voluntary resettlement" for legal immigrants.
In a special appeal to activists via the party's website, regional organiser Brian Mahoney said it was "time for all good men to come to the aid of the party.
"The Welsh Assembly election uses the d'Hondt formula of proportional representation for regional list seats. This is the same system which saw the British National Party gain its first seat in the London Assembly.
"Based on recent voting figures, the British National Party in Wales is in a position to seriously challenge for at least one, if not three, regional list seats in the Welsh Assembly in May."
This is South Wales
