Assuming the 'pdx' means you are in Portland, your soil is not likely to freeze more than at surface level so planting can be undertaken pretty much year round. An unusual time of year for a bare rooted product but since hostas are entering dormancy right about now, there is really no reason not to plant them now if you wish.

You could also pot them up but more work involved and storage to consider :-)

Great to learn that. Thank you