| Gates of the Arctic National Park | April | 0% | 0 |
| Kenai Fjords National Park | March | 0% | 69 |
| Lake Clark National Park | March | 0% | 3 |
| Voyageurs National Park | April | 0% | 157 |
| Katmai National Park | May | 1% | 159 |
| North Cascades National Park | November | 1% | 62 |
| Acadia National Park | February | 2% | 13,774 |
| Isle Royale National Park | October | 2% | 210 |
| Wrangell–St. Elias National Park | April | 2% | 520 |
| Badlands National Park | December | 4% | 10,544 |
| Glacier Bay National Park | April | 6% | 7,505 |
| Great Sand Dunes National Park | January | 6% | 5,413 |
| Theodore Roosevelt National Park | March | 6% | 9,332 |
| Great Basin National Park | February | 7% | 1,907 |
| Grand Teton National Park | November | 7% | 50,017 |
| Mesa Verde National Park | January | 7% | 6,140 |
| Capitol Reef National Park | January | 8% | 17,858 |
| Shenandoah National Park | January | 8% | 24,259 |
| Yellowstone National Park | April | 8% | 73,470 |
| Canyonlands National Park | January | 9% | 11,501 |
| Wind Cave National Park | February | 9% | 11,211 |
| Bryce Canyon National Park | January | 10% | 34,058 |
| Crater Lake National Park | April | 10% | 16,857 |
| Gateway Arch National Park | January | 11% | 51,776 |
| New River Gorge National Park | January | 13% | 37,071 |
| Olympic National Park | January | 13% | 81,950 |
| Black Canyon of the Gunnison National Park | February | 14% | 7,018 |
| Kings Canyon National Park | March | 14% | 16,338 |
| National Park of American Samoa | June | 14% | 434 |
| Rocky Mountain National Park | February | 14% | 111,660 |
| Indiana Dunes National Park | January | 15% | 75,633 |
| Mammoth Cave National Park | January | 15% | 15,220 |
| Big Bend National Park | August | 18% | 16,691 |
| Glacier National Park | October | 18% | 139,359 |
| Arches National Park | January | 19% | 36,146 |
| Mount Rainier National Park | May | 20% | 85,473 |
| Yosemite National Park | January | 21% | 115,014 |
| Saguaro National Park | July | 23% | 36,225 |
| Zion National Park | January | 23% | 139,474 |
| Redwood National Park | December | 24% | 22,579 |
| Cuyahoga Valley National Park | January | 26% | 97,437 |
| Denali National Park | May | 28% | 32,333 |
| Guadalupe Mountains National Park | August | 28% | 9,934 |
| Sequoia National Park | March | 29% | 57,038 |
| Great Smoky Mountains National Park | February | 30% | 485,531 |
| Grand Canyon National Park | January | 32% | 169,417 |
| Joshua Tree National Park | July | 33% | 136,502 |
| Petrified Forest National Park | February | 33% | 21,056 |
| Virgin Islands National Park | September | 34% | 13,653 |
| Channel Islands National Park | January | 35% | 12,484 |
| Lassen Volcanic National Park | October | 35% | 37,677 |
| Everglades National Park | October | 37% | 38,164 |
| Hot Springs National Park | January | 37% | 127,539 |
| Carlsbad Caverns National Park | January | 38% | 19,549 |
| Kobuk Valley National Park | May | 38% | 678 |
| White Sands National Park | February | 42% | 41,885 |
| Congaree National Park | August | 47% | 13,657 |
| Pinnacles National Park | September | 51% | 19,821 |
| Death Valley National Park | October | 55% | 88,753 |
| Dry Tortugas National Park | October | 57% | 4,965 |
| Biscayne National Park | October | 59% | 36,611 |
| Hawaiʻi Volcanoes National Park | April | 73% | 109,889 |
| Haleakalā National Park | February | 74% | 60,634 |