We have done 1000’s of tours, and can count on one hand the cancellations. If the road are safe, we suggest you go. Rarely is the Grand Canyon socked in, however it can happen. At 7500 feet in elevation, clouds typically “roll” into the Canyon. Think of a punch bowl full of dry ice. The clouds spill into the Canyon, blocking the view. We have excellent luck finding a clear spot.
BOTTOM LINE: We will call and tell you if we feel the tour should be canceled. Ultimately it’s your choice if the road are clear and safe.