Outside of Kanona, NY 415 heads through the rural northern portion of Bath before crossing into the town of Avoca. In Avoca, NY 415 initially bends to the west, passing directly south of the complex interchange between the Southern Tier Expressway and the south end of I-390. After , the highway curves northward, passing under the Southern Tier Expressway for the final time. Immediately north of the underpass, NY 415 intersects with CR 70A (Big Creek Road), a highway that was part of NY 70 until the mid-1970s. Continuing on, NY 415 reverts to a northwesterly track as it begins to parallel I-390 (the Genesee Expressway). The first connection between the two roads comes soon afterward by way of Michigan Hollow Road (unsigned NY 961J). Past this point, NY 415 makes a gradual bend to the north, bypassing the nearby village of Avoca to the west. Avoca itself is served by CR 7 (South Main Street).