Most park services and facilities are available from late May through September. In late fall, winter, and spring very limited services are available in the parks. Surrounding communities provide complete services year-round. Climate Glacier's weather is as varied as its landscape. F. Up slope, in areas above treeline, it is frequently 10 to 15 degrees cooler.
Strong winds predominate on the east side of the park.
Overnight lows throughout the park can drop to near 20 degrees F, and snow can fall anytime. In August of 1992, a foot of snow fell on the northeastern corner of Glacier. Prepare for a variety of weather conditions and pack accordingly. You may start the day in a T-shirt and shorts and need a parka by evening. Dress in layers.