大湊警備府
Later in March, "Nachi" received a refit at Sasebo for operations in northern waters, and patrolled the Kurile Islands in April and May. On 26 May, "Nachi" departed from Ōminato Guard District as flagship of Vice Admiral Boshiro Hosogaya’s force for the invasion of the Aleutian islands, and patrolled south of Attu, returning to Ōminato on 23 June. She departed Ōminato to escort another convoy to Kiska from 28 June, remaining in the Aleutian Islands until 7 July. After a refit at Yokosuka Naval Arsenal from 14–30 July, "Nachi" was reassigned to the IJN 5th Fleet with and . She continued patrols of the Kurile Islands though March 1943, and was sent as an escort for a reinforcement convoy to Attu from 7–10 March.