Idaho
National parks in Idaho
Idaho has no national park, but 3 other busy National Park System sites in this guide. The best months below balance mild weather and crowds.
| Park | Best months | Busiest | July high / January low °F | Visitors a year |
|---|---|---|---|---|
| Nez Perce National Historical Park | Sep | Jun | 82° / 25° | 355,000 |
| Craters of the Moon National Monument | Aug and Sep | Sep | 82° / 7° | 277,000 |
| City of Rocks National Reserve | Apr, Sep and Oct | Jun | 86° / 21° | 91,000 |
Idaho parks by month
| Month | Visitors, all 3 sites | Sites with mild weather |
|---|---|---|
| January | 26,000 | none |
| February | 28,000 | none |
| March | 35,000 | none |
| April | 47,000 | none |
| May | 79,000 | none |
| June | 104,000 | none |
| July | 96,000 | none |
| August | 87,000 | Craters of the Moon National Monument |
| September | 95,000 | Nez Perce National Historical Park, Craters of the Moon National Monument |
| October | 65,000 | none |
| November | 35,000 | none |
| December | 27,000 | none |
Weather 1991–2020 NOAA normals at each park's nearest station. Visitors National Park Service recreation visits, 2023–2025 average. Mild means an average high of 55–80°F without above-normal rain.