She returned to Norwegian waters after her refit and conducted several minelaying missions between 19 and 28 June together with "Z27". The ship took part in Operation "Zitronella", the German raid on the island of Spitsbergen in September where she was hit by coastal artillery and slightly damaged. "Z30" was one of the escorts for the battleship during Operation Ostfront on 25 December, an attempt to intercept the British Convoy JW 55B that was bound for the Soviet Union. All of the battleship's escorts were detached the following day to increase the likelihood of intercepting the convoy and did not participate in the ensuing Battle of North Cape. The ship was transferred to southern Norway in 1944 and escorted convoys and laid minefields from 8 May. She began a refit at Swinemünde, Germany, on 31 August and conducted operations in the western Baltic and Skaggerak when it was completed. While escorting a convoy on 20 October, "Z30" struck a mine off Oslofjord that crippled her. The explosion destroyed her stern compartment, knocked out the port turbine, jammed the starboard propeller shaft and caused extensive shock damage throughout the ship. Towed to Oslo, Norway, for repairs, they were not yet complete when Germany surrendered on 8 May 1945 and she was decommissioned six days later.