A group of 50 protesters had to be moved on from Woodville Campground after refusing to leave when denied entry.
A police spokesperson said about 50 people refused to leave Woodville Campground, about 30km from Palmerston North, on Monday afternoon, and there were reports of intimidating behaviour.
They were spoken to about 5.30pm and left with no charges laid, police said.
Woodville man Roy Giddens said he was the sole occupant of the campground when the group, believed to be anti-vaccine mandate, arrived.
"It went from nice quiet caravan park to absolute bedlam in about an hour," he said.