The Mount Washington Auto Road—originally the Mount Washington Carriage Road[1]—is a 7.6 mi (12.2 km) private toll road in southern Coos County, New Hampshire that extends from New Hampshire Route 16 in Green's Grant, just north of Pinkham Notch, westward across Pinkham's Grant and Thompson and Meserve's Purchase to the summit of Mount Washington in the White Mountains of the US state of New Hampshire.

[2] The Auto Road may be traversed by private vehicles, and there are also guided tours in vans, called stages.

The hillclimb's most notable victor to date has been former Tour de France contender Tyler Hamilton.

The climb is regarded as one of the world's toughest for cyclists—it features a greater altitude gain, and is steeper, than the Mortirolo Pass, the Monte Zoncolan, and the Alto de El Angliru, and is far steeper than any of the famous climbs featured in the Tour de France.

The only reason more MINIs do not drive to the summit is the fact there is not enough space to hold all the cars, despite their diminutive size.