All 63 parks

• Acadia
  ME · best Apr, May, and Nov · 4M visits/yr
• American Samoa
  AS · best Aug, Jun, and Dec · 18K visits/yr
• Arches
  UT · best Feb, Nov, and Mar · 1.5M visits/yr
• Badlands
  SD · best Apr, May, and Mar · 1.1M visits/yr
• Big Bend
  TX · best Feb, Jan, and Sep · 547K visits/yr
• Biscayne
  FL · best Jan, Dec, and Feb · 595K visits/yr
• Black Canyon of the Gunnison
  CO · best Apr, Mar, and May · 310K visits/yr
• Bryce Canyon
  UT · best Apr, Oct, and Aug · 2.3M visits/yr
• Canyonlands
  UT · best Feb, Mar, and Nov · 821K visits/yr
• Capitol Reef
  UT · best Mar, Feb, and Nov · 1.3M visits/yr
• Carlsbad Caverns
  NM · best Feb, Jan, and Oct · 401K visits/yr
• Channel Islands
  CA · best Jan, Feb, and Dec · 292K visits/yr
• Congaree
  SC · best Jan, Feb, and Dec · 240K visits/yr
• Crater Lake
  OR · best Jun, Sep, and Aug · 574K visits/yr
• Cuyahoga Valley
  OH · best Apr, May, and Sep · 2.9M visits/yr
• Death Valley
  CA, NV · best Jan, Feb, and Dec · 1.2M visits/yr
• Denali
  AK · best May, Sep, and Apr · 433K visits/yr
• Dry Tortugas
  FL · best Feb, Jan, and Dec · 84K visits/yr
• Everglades
  FL · best Nov, Oct, and Dec · 886K visits/yr
• Gates of the Arctic
  AK · best May, Jun, and Sep · 11K visits/yr
• Gateway Arch
  MO · best Oct, Apr, and Nov · 2M visits/yr
• Glacier
  MT · best May, Apr, and Oct · 3.1M visits/yr
• Glacier Bay
  AK · best May, Apr, and Jun · 563K visits/yr
• Grand Canyon
  AZ · best Sep, Nov, and May · 4.7M visits/yr
• Grand Teton
  WY · best May, Apr, and Oct · 3.5M visits/yr
• Great Basin
  NV · best Apr, May, and Mar · 149K visits/yr
• Great Sand Dunes
  CO · best Apr, Sep, and Oct · 496K visits/yr
• Great Smoky Mountains
  TN, NC · best Feb, Apr, and Mar · 12.8M visits/yr
• Guadalupe Mountains
  TX · best Jan, Feb, and Sep · 225K visits/yr
• Haleakalā
  HI · best Feb, Aug, and Jan · 864K visits/yr
• Hawaiʻi Volcanoes
  HI · best May, Sep, and Apr · 1.6M visits/yr
• Hot Springs
  AR · best Oct, Nov, and Dec · 2.5M visits/yr
• Indiana Dunes
  IN · best Apr, Oct, and May · 2.8M visits/yr
• Isle Royale
  MI · best May, Sep, and Jun · 28K visits/yr
• Joshua Tree
  CA · best Jan, Feb, and Nov · 3.1M visits/yr
• Katmai
  AK · best Jun, May, and Sep · 33K visits/yr
• Kenai Fjords
  AK · best May, Sep, and Jun · 407K visits/yr
• Kings Canyon
  CA · best Oct, Sep, and Nov · 665K visits/yr
• Kobuk Valley
  AK · best Jun, Aug, and Jul · 14K visits/yr
• Lake Clark
  AK · best Sep, May, and Jun · 18K visits/yr
• Lassen Volcanic
  CA · best May, Apr, and Oct · 417K visits/yr
• Mammoth Cave
  KY · best Feb, Nov, and Jan · 648K visits/yr
• Mesa Verde
  CO · best Apr, May, and Mar · 499K visits/yr
• Mount Rainier
  WA · best May, Jun, and Sep · 1.6M visits/yr
• New River Gorge
  WV · best Mar, Apr, and Nov · 1.8M visits/yr
• North Cascades
  WA · best May, Jun, and Apr · 30K visits/yr
• Olympic
  WA · best Apr, May, and Jun · 3.1M visits/yr
• Petrified Forest
  AZ · best Feb, Nov, and Apr · 498K visits/yr
• Pinnacles
  CA · best Jan, Dec, and Nov · 332K visits/yr
• Redwood
  CA · best Apr, Feb, and Mar · 626K visits/yr
• Rocky Mountain
  CO · best May, Jun, and Sep · 4.2M visits/yr
• Saguaro
  AZ · best Nov, Dec, and Oct · 959K visits/yr
• Sequoia
  CA · best Jun, Oct, and Sep · 1.2M visits/yr
• Shenandoah
  VA · best Apr, May, and Jun · 1.6M visits/yr
• Theodore Roosevelt
  ND · best Apr, May, and Oct · 735K visits/yr
• Virgin Islands
  VI · best Sep, Oct, and Aug · 352K visits/yr
• Voyageurs
  MN · best May, Sep, and Oct · 218K visits/yr
• White Sands
  NM · best Feb, Jan, and Nov · 716K visits/yr
• Wind Cave
  SD · best Oct, Apr, and May · 601K visits/yr
• Wrangell–St. Elias
  AK · best May, Sep, and Jun · 77K visits/yr
• Yellowstone
  WY, MT, ID · best May, Jun, and Aug · 4.4M visits/yr
• Yosemite
  CA · best Mar, Apr, and Nov · 3.9M visits/yr
• Zion
  UT · best Feb, Jan, and Nov · 4.9M visits/yr

Shortcut lists

Least crowded in summer · Warmest in winter · At their best in winter · Cool all summer