Sadly, the lilies are pretty much over with in Utah by now. It's very hot and dry there these days.
I just got back from visiting my kids in Salt Lake and even their daylilies are winding down in the summer heat.
I hope you have several months to tour around the US, Kathryn. There's a lot to see in the way of gardens. If you start in the northern tier states, you could finish up in Florida by December.