FLAGSTAFF, Ariz. (AP) – Many of the country’s most prominent national parks, including Grand Canyon, Yellowstone and Zion, set new visitation records in 2015.

Officials say the records could be short-lived as the National Park Service celebrates its centennial in 2016, when even bigger crowds are expected. The agency has been urging Americans to rediscover the scenic wonders.

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Overall visitation is on track to hit 300 million for 2015, besting last year’s all-time high of nearly 293 million.

Absent December totals, Grand Canyon in northern Arizona has almost 5.3 million visits. Zion in Utah has 3.5 million.

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Yellowstone, which stretches into Montana, Wyoming and Idaho, is nearing 4.1 million.

Yosemite in California is about 220,000 visits shy of the 1996 record — 4.2 million — with November and December still left to count.

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Copyright 2015 The Associated Press.