I have boondocked at the Columbia Icefields parking lot on two occasions for free (Interpretive Centre) as no one bothered me or anyone else there in an RV.... it's not really advertised but it is the only overnight destination to park an RV there without paying while stopping short of saying to encourage people to do so....pretty sure if one would stay multi days at a time they would stick out with officials.
Weather fronts do howl thru there pretty bad at times as I spent the night there in Sept. 2012 and Sept. 2013....
Sept 2013 - Interpretive Centre parking lot -Columbia Icefield- Jasper Nat'l Park Alberta :
Sept. 2011 I was thinking of spending the night there but it got so cold with heavy drizzle rainfall, close to zero visibility, smelling snow type moisture in the air I decided to move on and head to lower elevation ground and just push it to Jasper for two reasons :
Potential snow with delayed travel...
Seeing Jasper for the first time on a potential clear day and hit the tram ....
Boy, did the latter work perfect....it was totally clear the day after pushing it to Whistler's campground in Jasper - was clear as a bell until 20 minutes on the upper terminal ....as the Icefields Parkway had closed from the Columbia Icefield to I believe the Sunwapta Falls area gate for a day.
Sept 2011 - Whistlers Mountain -upper terminal- Jasper Nat'l Park Alberta :