It's been very warm during the past couple of days. It was about 67°F when I took this photo.
I'm pretty sure this moth is in the genus Pero. The Moths of Western North America says that there are 16 species of Pero in the West, but it only discusses and illustrates 4 of the 16, so I'm reluctant to try to identify it to species at this time.
Here are two close-ups of the wings.