Arapaho National Forest Boundary Adjustment Act of 2019 This bill adjusts the boundary of the Arapaho National Forest in Colorado to incorporate approximately 92.95 acres of land described as lots 3, 4, 8, and 9. A lot may be included in the boundary's adjustment only after the Department of Agriculture (USDA) has obtained written consent for its inclusion from the owner of the lot. USDA shall include all federal land within the boundary in the Bowen Gulch Protection Area.