Only mendicino is found in Oregon. I use a site called PNW Pacific Northwest Moths for help sometimes.
My hatchings were indoors, data from the PNW site, April is peak flight, although there is some variation with locality.
I have never observed the moth in the wild, many years ago I was gifted some Saturnia mendicino ova, but I've never seen
them offered. Actually, there is a dusting of snow outside right now, from me, Florence is about 80 miles south. Brookings is the spot to go,
or inland a bit towards Itsy bitsy towns like Ruch, I've been kicking around a collecting trip, but it's a long drive for such hard to find moths,
although if you don't go, you definitely won't find any.