Jump on the Empire Builder with your bike (no boxing needed) and do it. I know people have stayed at the Whitefish Bike Retreat (no affiliation) and coordinated a special shuttle to the park and back. Check out the Path Less Pedaled YouTube video wherein they did just that (they came from Portland and had to box their bikes).
I’d guess there will be at least three more weekends of car-free access (but don’t quote me). One can access higher elevations during the week as long as you arrive in time to get to the current pedestrian closure by 5:00 (quitting time), but that means it’ll be getting dark as you descend so be prepared!
I’m out of town for the next two weekends, but I’m happy to advise if anyone has questions.
Hosting out of towners helps to keep me humble: this isn’t to be taken for granted.
