The rate for forestry is more than twice that of commercial properties, four times that of residential properties, and more than five times the rates paid by farmers.
As a result, foresters say their rates have risen 56 per cent, adding to previous increases which meant that rates for some forest owners had tripled over four years.
The New Zealand Forest Owners Association (NZFOA) sought a judicial review of the new rating system in the High Court, arguing that the rating changes were unfair and unreasonable and improperly targeted them because they were wealthy.
However, Justice Christine Grice dismissed the NZFOA's claims, which had been brought on behalf of seven landowners who between them controlled two-thirds of Wairoa's 77,000 hectares of forestry plantations.
An NZFOA spokesman told Open Justice the association was now "actively considering" an appeal against the judgement.
"We believe we have good grounds for an appeal," he said.