Bryan and TWEETS,
I do put out two hummingbird feeders from late February through early October as well as having been planting bird attracting plants on our seven acres for the last 34 years. Our property in Skamania County is only about a mile from the Clark County line and just 20 miles to the East of Vancouver, where the Anna's Hummingbird is common. Despite being close to a stable reservoir of Anna's we have more sighting records of Black-chinned and Calliope Hummingbirds from our feeders. Both of these species are annual visitors while we have only had about a half dozen visits from Anna's Hummingbirds.
I do recognize the problem of using the garden zones at a reference which is why I identified that I was referring to the Sunset Western Garden Book rating system. I have found that due to the various micro-climates throughout the Gorge that these ratings are nearly worthless. I have seen Photina fraseri growing fine in the City of Lyle in Klickitat County while they are deciduous at our place. The famed Gorge winds that attract the windsurfers also affect the plants especially the cold and dry east winds. River valleys such as along the Klickitat River in the towns of Klickitat and Lyle have good populations of Anna's Hummingbirds, which leads me to think that our elevation and exposure to the winds may a limiting factor for this species.

Wilson Cady
Washougal, WA