Iowa
National parks in Iowa
Iowa has no national park, but 2 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 |
|---|---|---|---|---|
| Herbert Hoover National Historic Site | Oct | Aug | 84° / 12° | 121,000 |
| Effigy Mounds National Monument | Oct | Jul | 83° / 10° | 60,000 |
Iowa parks by month
| Month | Visitors, all 2 sites | Sites with mild weather |
|---|---|---|
| January | 7,900 | none |
| February | 9,900 | none |
| March | 13,000 | none |
| April | 12,000 | none |
| May | 16,000 | none |
| June | 20,000 | none |
| July | 23,000 | none |
| August | 24,000 | none |
| September | 20,000 | none |
| October | 16,000 | Herbert Hoover National Historic Site, Effigy Mounds National Monument |
| November | 11,000 | none |
| December | 8,700 | 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.