The Trump administration has expanded efforts to remove or alter information about history and science at national parks, including sites at the Grand Canyon, Glacier National Park and other locations across the West, according to a report published Tuesday by The Washington Post.
The newspaper reported that this month “Trump officials instructed staff to remove or edit signs and other informational materials in at least 17 additional parks in Arizona, Texas, Colorado, Utah, Montana and Wyoming.” The documents reviewed by the Post also included removals ordered in August and September of last year.
The latest actions follow reports from September 2025 that signs were removed from Acadia National Park’s Cadillac Mountain and Great Meadow wetland areas. Those displays referenced climate change impacts on the park, including more frequent storms, heavier rainfall and rising temperatures.
Kristen Brengel, senior vice president for government affairs at the National Parks Conservation Association, said the removals amount to a broad effort to suppress factual information at national parks.
“The administration is suppressing truth, facts, and science at our national parks and that should alarm every single American,” Brengel said. “This dangerous campaign to erase history and science is a tremendous insult to the national parks we know and love. The administration is forcing National Park Service staff to censor everything from climate science at Glacier to the mistreatment of Native Americans at the Grand Canyon, a place of worship and origin for many Tribes. This is a violation of the core tenets of the National Park Service’s mission.”