Denver drivers can leave the plains and be carving alpine switchbacks above the treeline within an hour, with some of the highest paved roads in North America on the doorstep.

The highest paved road in North America, topping out at 14,130 feet with steep climbs, hairpins, and Front Range views. The summit road needs a timed reservation and is open Memorial Day to Labor Day.
Best time to go: Summit road open Memorial Day through Labor Day only, with a timed vehicle reservation required.

Sources: Length · High point · Best time. Drive time is the route time for the mapped route without stops, from Mapbox.

A 48-mile alpine traverse through Rocky Mountain National Park climbing to 12,183 feet past wildflower meadows and continental-divide vistas (summer only).
Best time to go: Summer to early fall; the high section closes for snow from about October to May.

Sources: Length · High point · Best time. Drive time is the route time for the mapped route without stops, from Mapbox.

A short, tight set of switchbacks climbing from Golden to a 7,377-foot summit with panoramic views back over Denver and the foothills.
Best time to go: Open year-round; part of Lookout Mountain Road has a night closure.

Sources: Length · High point · Best time. Drive time is the route time for the mapped route without stops, from Mapbox.

A scenic byway in the foothills just west of Denver, a 40-mile loop through Golden, Evergreen, and Morrison stitching together classic foothills canyon driving.
Best time to go: Accessible year-round; night closure on part of Lookout Mountain Road.

Sources: Length · Best time. Drive time is the route time for the mapped route without stops, from Mapbox.
A high-country byway over an 11,669-foot pass linking Georgetown and Grant, blending tight climbs with alpine lakes and peak views.
Best time to go: Late May to late November; seasonally closed from about Nov 26 to Memorial Day weekend. Aspen color usually Sept 10 to Oct 10.

Sources: Length · High point · Best time. Drive time is the route time for the mapped route without stops, from Mapbox.
Open Road keeps every drive: the route on a map, the time and the distance. On iPhone and Android.