But you must prepare for the weather. An average 4-foot base of snow in the valley is much deeper in the mountains. Daytime temperatures range from -25° to +50°F. Severe winter storms and blizzards can occur throughout the season. All oversnow travel is prohibited in the Snake River bottom between Moose and Moran as well as in the Willow Flats at Jackson Lake Lodge. Check at the Moose Visitor Center for exact boundaries on these closed areas. [Illustration: _Moose Visitor Center is the registration point for winter activities, including mountaineering._] [Illustration: _Winter sports wait only for that first good snow._] [Illustration: Cross-country skiers.] Management Concerns and Safety Many management concerns and safety tips are given under specific subjects in this handbook. Here are other things to consider. Camp only in designated sites. Obtain a backcountry use permit for all overnight backcountry use, including in winter. Register at the Jenny Lake Ranger Station in summer or park headquarters in winter before starting any off-trail hike or climb. Boat permits are required for the use of any watercraft on park waters. Fishing requires a Wyoming license, and please check park regulations at a visitor center. Obtain an oversnow vehicle permit at Moose Visitor Center and check the regulations before operating a snow-mobile or snowplane in the park. Bicycles are not allowed on trails or in the backcountry. Pets must be leashed and under physical restraint at all times. They are not permitted on trails, in buildings, or in the backcountry. Kennels are found in Jackson; check with the chamber of commerce. All natural features are protected; leave all rocks and plants in their natural setting. All park animals, including bears, are wild and protected by law. Do not feed or molest them. Please read the Bear Warning under Backcountry Basics. Driving Tips. Drive carefully and defensively, especially at dawn, dusk, and at night. Every season large animals are killed and vehicles are mangled. Slow down, and ask passengers to help spot animals in the road. When stopping to view wildlife, stop in turnouts, be careful to stop your vehicle in the safest position possible, with all doors shut. Consider traffic flow problems and their potential hazard. Be a responsible driver. Keep motor vehicles off bikeways. Report all accidents to a park ranger. Observe posted speed limits. Respect Wildlife.