I-5 north is torn up all the way through Everett right now. Took me over an 1 and 1/2 to get to Mt Vernon from the northern most point of Seattle a few weeks ago (should be under an hour!). Give yourself 3- 3.5 hours or so to hit the boarder from Seattle. Even in non-rush hour and on weekends there is traffic headed north right now. Insane, I know.