"Blue hour" is a term given to that time prior to sunrise and just after sunset, when the sky and landscape are bathed in swaths of blue, purple, pink, and mauve. During that time (which really doesn't last an hour - more like a few minutes), you might even see the atmospheric phenomenon known as the "belt of Venus," a line of deep blue and dark pink parallel to the horizon. A great place to view sunrise, sunset, and blue hour is at a pullout immediately after the turnoff from Colorado State Highway 150 onto Lane 6 N toward Mosca. From this vantage point, you can see east and west of, and north toward, this national park.