Smarts Mountain is a mountain located in Grafton County, New Hampshire. Smarts is flanked to the north by Mount Cube, at 2,909 feet (887 m), and to the southwest by Holts Ledge, at 2,110 feet (640 m). Although of only moderate elevation, Smarts is separated from the southwestern White Mountains by Oliverian Notch, a fairly low pass traversed by New Hampshire Route 25 southwest of Mount Moosilauke. That gives Smarts a relative height of 2,190 ft (670 m), which makes it one of twelve mountains in New Hampshire with a prominence over 2,000 ft (610 m).