There is no free parking anywhere near St. Mary's Glacier, only $5 parking on private property with limited space. There are no parking and no trespassing signs on nearly every tree up there.
The forest service needs a little pressure from us citizens to get their act together and provide legal parking for their tax paying citizens.
As of July 22, 2011, (besides the small pay lot) I have opened up the old ski area parking lot for more (legal) pay parking. The forest service will not provide all I am providing with my properties or just parking for that matter. St. Mary's is a private sub-division, which has public access thru private property, however, the glacier hike itself is mostly private property as well. As of now there no plans to stop the use, in fact I have insured this. On a side, if the USFS did what I am doing with my property, they would be charging or concessionaire it out. I provide 4 porta-potties(2 at each lot), trash/recycle cans, dog waste bags, and a year round maintained legal parking area for all visitors, and I now have plenty of space. It is $5 per vehicle, per day. Hope this helps, pm me if needed. Thanks, Paul