Make the move! If you keep those rhododendrons in containers out of the hot sun but close to the house and out of the cold winds they can survive in that climate. The varieties that will do the best will be those with deep red or purple blooms and deep green leaves - dark bloomers like dark-skinned people handle the sun better. They will not like the dry, sandy soil in Eastern Washington so grow them in containers of potting soil with extra peat moss added and you will need to water them much more often during the summer months than you did when they were growing near the cool coast. I suggest you tour some gardens in the area and see what else does well in that climate - then learn to love what is the easiest to grow. Keep growing, Marianne Binetti