The road to the election begins for the National Party this weekend

The caucus will be joined by the party's newest candidates when it meets for the first time at its annual retreat in Hawke's Bay.

Leader Simon Bridges says the new candidates will receive campaign training to prepare them for September's election.

It's the first time the new candidates, including former Air New Zealand boss Christopher Luxon, have gathered alongside MPs.

While many candidates have already been announced, there are still 25 electorates where a National candidate has not been selected.