May. Snow level may remain just above valley elevation until mid-June. Warm days and cool nights prevail, with afternoon thunder showers common. Snow level gradually retreats, with mountain divides free of snow by August. Sunny days and cold nights alternate with rain and snow-storms. Snow becomes persistent by late fall.
Blizzards are common with occasional sunny days and frigid nights between storms.
Visitors may travel west from Riverton, WY, or Casper, WY, over Togwotee Pass and thence into the park's east entrance. Visitors may also travel south from Yellowstone National Park, the John D. Rockefeller, Jr., Memorial Parkway and through Grand Teton's north entrance. Work Outdoors at GORP Jobs Click Here. All rights reserved.