Jackson Hole has long, cold winters. The first heavy snows fall by November 1 and continue through March; snow and frost are possible during any month.
Mid-April, May, June
Mild days and cool nights alternate with rain and occasional snow. Valley trails are snow covered until late May.
July and August
Warm days and cool nights prevail, with afternoon thundershowers common.
September, October, November
Sunny days and cold nights alternate with rain and occasional snow storms.
December through mid-April
Between storms the days are sunny and nights are frigid. Snow blankets mountains and valley. Travel is not advised and roads may be closed during blizzards.
Snake River: Headwaters of the Columbia River system, 1056 miles long. Approximately 50 miles lie within Grand Teton NP. Major tributaries: Pacific Creek, Buffalo Fork, and Gros Ventre River.
Lakes: Seven morainal lakes at the base of the Teton Range: Jackson, Leigh, String, Jenny, Bradley, Taggart, and Phelps. Jackson Lake: 25,540 acres (10,340 hectares) maximum depth 438 feet (134 m). Over 100 alpine and backcountry lakes.
17 species of carnivores (black and grizzly bears)
6 species of hoofed mammals
3 species of rabbits/hares
22 species of rodents
6 species of bats
4 species of reptiles (none poisonous)
5 species of amphibians
16 species of fishes
300+ species of birds
numerous invertebrates (no poisonous spiders
7 species of coniferous trees
900+ species of flowering plants
Accessibility: Facilities for visitors with disabilities include restrooms, picnic tables, and a limited number of campsites.
There are approximately 100 miles of park roads and 200 miles of trails throughout the park. Most park trails are rough rock or dirt and are not accessible to visitors with disabilities.
There are many asphalt trails in the Jenny Lake area, some of which are accessible. Some trails may begin as asphalt and change to dirt or gravel shortly thereafter
Recommended Clothing: Raingear is recommended during spring, summer, and fall. Sub-zero temperatures are common throughout winter and demand multi-layered clothing, hats, mittens and cold weather boots.
Fees are established annually. Call the Park or consult their website for current fees. 2004 fees were:
$20.00 per vehicle, $10.00 per person for single hiker or bicyclist, $15.00 per motorcycle-covers both Yellowstone and Grand Teton National Parks
Fees are also charged for watercraft, backcountry reservations (not permits) and snow planes.
Pets in the Park: Grand Teton National Park is a protected area where wildlife is free to roam undisturbed. Park visitors should be able to enjoy native wildlife in their natural environment without the disruption of other people’s pets. For this reason pet restrictions are enforced.
A good rule is a pet may go anywhere a car may go: roads and road shoulders, campgrounds and picnic areas, parking lots, etc. Pets must be on a leash and under physical restraint. Pets are not permitted on any park trails or in the park backcountry. Pets are not considered pack animals.
You are responsible for clean-up and disposal of all pet feces.
Pets must be kept under physical control at all times caged, crated, or restrained on a leash not to exceed six feet in length.
Pets are prohibited in the backcountry and on park trails.
Pets are prohibited from public buildings and swimming beaches, except for guide dogs.
Pets are prohibited from riding in boats on park waters, except for Jackson Lake.
Pets must stay within 50 feet of any roadway.
Pets must not be left unattended and/or tied to an object.
Pets are prohibited from making unreasonable noise or frightening wildlife.
Pets running-at-large may be impounded and their owner charged for the care and feeding of the animal.