·:[ National Park Reservations Blog ]:·
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As promised I found out about road conditions at Glacier AND went the extra mile and found out about all road access in several national parks that might have special winter conditions. 

Glacier National Park
Glacier is open all year but roads are closed to motorized traffic during the winter.  Roads generally open up in late May and remain open until early September or as dictated by the weather.

Yosemite National Park
Yosemite is always open to motorized traffic all year, and you can enter or leave the park at any time.  In the winter chains and/or snow tired are advised or required.  Call ahead for information on this requirement.

Grand Teton National Park
Grand Teton has all roads accessible starting in early to late May.

Yellowstone National Park
Yellowstone is open all year.  This is one of the only parks that is snowmobile accessible.  Starting in mid-March snowmobile trails close and roads are cleared for all motorized vehicle travel. 

       April 20, 2007 West side roads open to motor vehicles. Mammoth to Norris Junction to Madison Junction to Old Faithful; Madison Junction to West Entrance; Norris Junction to Canyon
        May 4, 2007 Canyon to Lake; Lake to East Entrance
       May 11, 2007 Tower to Tower Fall; Lake to West Thumb; West Thumb to Old Faithful; South to Old Faithful.

Olympic National Park
Olympic National Park is open 24 hours a day, 365 days a year, although some roads, campgrounds and other visitor facilities close in winter. Call for more information.

For more information on road conditions call National Park Reservations toll free at 1-866-875-8456.