A convoy of 50 tractors and utes are set to thunder down Auckland's Queen St tomorrow as thousands of farmers around the country gear up for a "howl of a protest" that will see vehicles parade through urban centres across New Zealand.

Groundswell NZ has organised the protest in 47 towns and cities on Friday.

Pukekohe to Auckland organiser Scott Bright said that 50 tractors would be escorted by police along the Southern Motorway from Drury starting at 9.20am.

The convoy would leave the motorway at Wellesley St, travel down Queen St before going along Beach Rd and rejoining the motorway heading south from Stanley St.

People have been encouraged to bring their tractor, ute and dogs for a bark-up in protest against what has been described as "increasing Government interference, unworkable regulations, and unjustified costs".

A "massive" number of tractors are expected on Auckland's Queen St down to Southland.

Groundswell co-founder Bryce McKenzie, from West Otago, is expecting an "enormous" response to the nationwide event.

The only major city Groundswell had left off the itinerary - and that was intentional - was Wellington.

McKenzie was expecting a "massive" number of tractors in Auckland's Queen St. The logistics were different in the various areas, with some towns requiring traffic management plans, he said.

Bright said a number of vegetable growers would be donating three tonnes of vegetables to the City Mission.

The Herald understands a protest planned for Christchurch has been moved out of Cathedral Square as organisers were expecting a large number of participants.

Some protesters have been diverted to other Canterbury towns.

Christchurch organiser Aaron Stark told John MacDonald on NewstalkZB their main concerns are around constant changes to regulations and the "moving of goal posts".

"We're fed up to be honest. Every farmer I know around here, around Canterbury, we're having the talk that maybe it's time to hang up the boots and find something else to do.

"It's getting to a point where we can't do it."

The Otago Daily Times is reporting in Dunedin, organisers have decided it would not be safe for the protest to stop in the city so participants will drive through the Octagon, between about noon and 12.15pm, their dogs barking.

They will then return to Mosgiel where former Invermay head Dr Jock Allison would give a short address and Marshall would deliver Groundswell NZ's statement on how it sees things.

Even though protest vehicles would be keeping left and letting other traffic flow as smoothly as possible, there would still be significant disruption to the travelling public around Dunedin and Balclutha and more time should be left to get to destinations.

In Levin, tradies and farmers are planning to drive their utes and tractors down Oxford St.

The local protest group is planning to meet at Donnelly Park at 11am. The convoy would then leave for a drive through Oxford St at noon.

Roy Williams, of Levin Scaffolding Ltd, and Ingo Schleuss, of Kapinua, setting up the protest banner south of Levin yesterday. Photo / Supplied

Hundreds of farmers, growers and tradies are expected to take to the streets around Northland.

Protests in Whangārei, Dargaville, Kerikeri and Kaitaia are due to start around the country at 11am.

Whangārei co-ordinator Tracey Thomasson said she expected up to 200 vehicles.

In Dannevirke, the protest kicks off on High St around 12.15pm.

The parade of tractors, trucks, vehicles and people walking will start from the old Farmers Transport south of town and the Mangatera Hotel north of town.