Mario Tama / GettyAn aerial view of visitors walking around Grand Prismatic Spring in the Midway Geyser Basin on May 24, 2026, in Yellowstone National Park, Wyoming. Grand Prismatic Spring is the largest hot spring in the United States at more than 300 feet wide at its widest point, and more than 120 feet deep. The colors outside the pool’s blue center are created by “thermophiles”: heat-loving microscopic organisms that flourish in many of Yellowstone’s hot springs.Mario Tama / GettyA bison with molting (shedding) fur stands near a tree in Yellowstone National Park on May 19, 2026.Mario Tama / GettyA view of the Lower Falls of the Yellowstone River, seen after a recent snowfall, in the Grand Canyon of the Yellowstone on May 21, 2026Mario Tama / GettyVisitors gather as steam rises from the Midway Geyser Basin on May 16, 2026.Mario Tama / GettyA “Bear Danger” sign is posted as visitors look for wildlife in Lamar Valley on May 18, 2026, in Yellowstone National Park.Mario Tama / GettyA grizzly bear walks through grasslands on May 23, 2026, in Yellowstone.Mario Tama / GettyYellowstone visitors attempt to photograph and catch a glimpse of a grizzly bear on May 17, 2026.Mario Tama / GettyThe sun rises above Mammoth Hot Springs on May 19, 2026, in Yellowstone National Park.Mario Tama / GettyA bison grazes near Midway Geyser Basin on May 23, 2026.Mario Tama / GettyVisitors gather beneath an American flag in the Old Faithful Inn, a national historic landmark, on May 20, 2026. Completed in 1904, just a short walk from Old Faithful Geyser, the hotel stands as one of the world’s largest log structures and features a 76-foot-tall lobby and 500-ton stone fireplace.Mario Tama / GettyA person poses for a photo near a grazing bison on May 19, 2026.Mario Tama / GettyHorseback riders participate in the Hell’s A-Roarin’ Horse Drive, a fundraiser for disabled veterans, in the gateway town of Gardiner on May 23, 2026, in Gardiner, Montana. Every Memorial Day weekend, Warren and Susan Johnson drive their horses and mules from the Gardiner Rodeo Grounds out to the Johnsons’ ranch, located a half mile from Yellowstone National Park, for the summer.Mario Tama / GettyAn aerial view of the Hell’s A-Roarin’ Horse Drive passing through the gateway town of Gardiner on May 23, 2026.Mario Tama / GettyA herd of elk, grazing in Yellowstone on May 19, 2026Mario Tama / GettyA National Park Service ranger on horseback patrols for elk to help keep them safe from grizzly bears during calving season, on May 20, 2026.Mario Tama / GettyBison walk along a roadway as drivers wait during a “bison jam” on May 19, 2026.Mario Tama / GettyMemorial Day–weekend visitors wait in line to enter Yellowstone National Park on May 24, 2026, in West Yellowstone, Montana.Mario Tama / GettyA bison grazes after a recent snowfall on May 21, 2026.Mario Tama / GettyA young calf nuzzles an adult bison as snow falls in the Hayden Valley on May 21, 2026, in Yellowstone National Park. Affectionately known as “red dogs,” bison calves are normally born in April or May in Yellowstone.Mario Tama / GettyA bison stands while grazing, as snow falls in Hayden Valley on May 21, 2026.Mario Tama / GettyPeople watch Castle Geyser erupt in Upper Geyser Basin on May 22, 2026, in Yellowstone National Park, in Wyoming.
