I had plans to get out there in Mid September last year but the fires burned out that plan. Friends of mine live in hungry horse and say from June to end of August its usually a mad house. Get up early and get in the park to avoid the stalemate, That way as you are on your way out you can pass up all the other's that slept in to late.
Yellowstone was our next bet and of all things...we get snowed out in a freak snowstorm, three days in the park turned into only 5 hours worth of being in there. They closed the park on us on our way out of the south entrance.
Glacier is back on the list for this year, hope the fires stay away.