North Fork Watershed Protection Act of 2013 - Withdraws federally owned land or interest in land within the North Fork Lands Withdrawal Area in Montana from: (1) all forms of location, entry, and patent under the mining laws; and (2) disposition under all laws relating to mineral and geothermal leasing.
Provides that nothing in this Act prohibits the Secretary of the Interior from taking any action necessary to complete any requirement under the National Environmental Policy Act of 1969 (NEPA) or the Endangered Species Act of 1973 concerning surface-disturbing activity that occurs on any lease issued before this Act's enactment.