Check out the weather before you go.
Even if it usually is, with the late storms this year, it's hard to say. I just took a train through there and usually there's a lot less snow this time of year... but mid-July usually has all trails open... you'll have to monitor their weather site (there's even videos of the streets you can find), or you can use sites like this: http://www.hikinginglacier.com/glacier-national-park-weather.htm or follow their Facebook page, sometimes they post about the current weather. Hope this helps, Good luck!
There is a lot of area company that offers discounts on tickets, I hope I have helped. Boa noite
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