Around springtime is a higher risk of earthquakes due to water pressure on rocks, higher water table, slight movement in soil and rocks due to water displacing things. So I read somewhere.
A winter/spring event would save a lot of lives here on the Coast. I think this may be a record summer for tourists here on the Coast. I don’t think they may fair better in Portland or Seattle though due to aged buildings and infrastructure.
As an aside, at least one coastal town I know of has stockpiled body bags. Others may be doing the same but not mentioning it.