The authority, which co-governs Auckland's mountain reserves on behalf of 13 Tāmaki Makaurau iwi, announced plans to replace the Ōwairaka trees with natives in November 2019.
However, nearby residents expressed alarm at the loss of mature oaks and other exotics and suggested if all were removed at once, it would affect bird life on the maunga.
Meanwhile, a Tupuna Mauna Authority spokesperson has said the authority would take advice on the implications of the court's decision for the Tūpuna Maunga restoration programme. "It is noted the Court of Appeal did not decide against tree removal, rather the legal process to be followed."