Hold on to your hats – Yellowstone national park staffers have removed a record-setting 20,100 pieces of trash from hydrothermal areas around the geyser-filled park so far this year.
The most commonly found items include 280 hats, 54 camera lens caps, 47 hair ties, 42 pencils, 36 pairs of sunglasses, 20 hotel key cards and 17 baby pacifiers.
“The issue is made worse by the park’s high winds: unexpected gusts easily blow away tissues, maps, food wrappers, and even heavier items like sunglasses and hats!” Margery Price, a physical science technician with the Yellowstone national park geology program, said in a blog post for the US Geological Survey.
That, and park visitors treating the hot springs like wishing wells. The Yellowstone geology team collected more than $18 in coins during summer 2026, in currencies ranging from the dollar and pesos to yen and euros.
With more than 4.5 million visitors annually, Yellowstone is one of the most highly visited national parks in the United States.
“No matter the type of debris, it needs to be removed. Foreign material of any kind can damage or permanently alter a hydrothermal feature, whether from clogging its water supply, blocking or diverting its runoff channel, or polluting it with chemicals and sediment,” Price said.
In the 1900s, the park’s Morning Glory Pool changed color from all of the trash visitors were leaving in the pool, which was nicknamed “trash can” by the 1950s.
This year, the park’s geological staff retrieved six Invisalign retainers, eight mini race cars, three golf tees and 15 fake nails.
While the park’s staff understands that much of that trash gets swept away by accident, they encourage visitors to “stash your trash” when visiting Yellowstone. That is, packing wrappers, tissues and even hats carefully away in windy areas. At the end of the season though, they’ll be sure to wash and donate all of the hats left behind.
