Avalanche Campground is our favorite Glacier National Park west side campground in the main area of the park....but it is large with 87 sites and because it is first come first serve which we love, you might have to stalk a campsite that you see packing up to score a site.  It fills up early so do not delay (we have learned this lesson on a trip before).  On our most recent visit we arrived on a Friday morning in July at 8:30 am and found a site but the campground filled up within the hour!  Our site on this visit was a nice pull through site which gave us room to drop the camper and drive around the park. This location in the park is a great basecamp for a drive over the Going to the Sun Road and the trailhead to Avalanche Lake is right at the campground and is a lovely hike! The hike is an easy 4.5 miles roundtrip to a beautiful lake. Leave early as either outing gets really busy!   My pictures are from 2 different visits.