Alaska is a big state, you don't say what region you're looking in.If it is any region besides Southeast, I think you're S.O.L.
I've traveled in Alaska off and on for 20some years and am a fairly experienced forager. I have never collected an active psilocybe in Alaska, nor heard a trustworthy report of any. Lots of interesting edibles, and lots of amanitas, but no (active) psilocybes.
I have never foraged in southeast Alaska, but have been there (Juneau, Petersburg, Sitka) many times. The climate seems possible for cyanescens, could be.
Best bet is to check with the nearest agricultural extension or U of A campus and see if they offer classes. Most mycology types aren't too stuffy about an interest in psilocybes if your interest is genuine.