I was planning my 5th Alaska trip this year and as far as I know Canada will not let you in. Only several weeks ago even if you had made it through the international border you were not supposed to enter the Yukon now BC residents are allowed. I don't expect the international border to open before fall -- if it opens this year.
You should be able to take the ferry from Washington to Alaska. Of course, that can be quite pricy and usually reservations are scarce by the summer but this year might be different.
Right, ... Canada does not want us ignorant, undisciplined, arrogant folks crossing their borders...don't blame them!! Were currently on travel: Arizona, Nevada, Idaho, Montana, Wyoming...not yet Colorado. States like Montana and Wyoming don't seem very lackadaisical in mask wearings. Other than that there are absolutely no restrictions regarding State crossings. No one checks your license plates even from "hot" States. Plenty of RV's/ 5th wheelers/ trucks and Vans on the roads just like a normal summer. Lots of traffic.As you probably know, Canada has extended the border crossing ban for another 30 days.
Their covid "new case" rate is low and holding steady, ours is going up.