This Final Environmental Impact Statement assesses an oil and gas lease sale in the 2012-2017 Outer Continental Shelf Oil and Gas Leasing Proposed Final Program for the Cook Inlet Planning Area. Oil and gas lease sale 258 includes 224 unleased blocks comprising the very northern portion of the Cook Inlet Planning Area (the Cook Inlet north of Seldovia and east of Augustine Island; the planning area lies south of Kalgin Island). This document is to be used to inform the lease sale process for Cook Inlet Oil and Gas Lease Sale 258, which BOEM was required to hold by the end of December 2022 as directed in the Inflation Reduction Act of 2022 (Pub. L. No. 117-169, enacted Aug. 16, 2022). While BOEM had no discretion on whether to hold the sale, BOEM has prepared this Final EIS to follow its normal leasing process to the fullest extent possible. This Final EIS contains analyses of the potential environmental impacts that could result from a Cook Inlet lease sale.