Last Updated on 22 September 2023
| March | Events |
| 1 | 1872 – Yellowstone National Park, ID, MT, & WY created 1933 – Saguaro National Park, AZ created 1972 – Buffalo National River, AR created |
| 2 | 1889 – Casa Grande Ruins National Monument, AZ created 1899 – Mount Rainier National Park, WA created 1909 – Olympic National Park, WA created 1917 – Guilford Courthouse National Military Park, NC created 1923 – Hopewell Culture National Historical Park, OH created 1923 – Hovenweep National Monument, UT created 1927 – Wright Brothers National Memorial, NC created 1933 – Black Canyon of the Gunnison National Park, CO created 1933 – Morristown National Historical Park, NJ created 1936 – Richmond National Battlefield Park, VA created |
| 3 | 1877 – Statue of Liberty, NY accepted 1925 – Fort McHenry National Monument and Historic Shrine, MD created 1925 – Mount Rushmore National Memorial, SD created 1927 – Stones River National Battlefield, TN created 1931 – Isle Royale National Park, MI created 1992 – Manzanar National Historic Site, CA created |
| 4 | 1907 – Jean Lafitte National Historical Park and Preserve, LA created 1925 – Arlington House, The Robert E. Lee Memorial, VA created 1929 – Cowpens National Battlefield, SC created 1931 – Fort Necessity National Battlefield, PA created 1952 – Christiansted National Historic Site, VI created |
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| 7 | 1974 – Big South Fork National River and Recreation Area, TN created |
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| 10 | 1966 – Cape Lookout National Seashore, NC created |
| 11 | 1907 – Chaco Culture National Historical Park, NM created 1948 – De Soto National Memorial, FL created |
| 12 | 2019 – Pearl Harbor National Memorial, HI created 2019 – Tule Lake National Monument, CA created |
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| 15 | 1965 – Lake Meredith National Recreation Area, TX created |
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| 17 | 1932 – Great Sand Dunes National Park and Preserve, CO created 1938 – Salem Maritime National Historic Site, MA created |
| 18 | |
| 19 | 1936 – Homestead National Monument of America, NE created |
| 20 | 1909 – Navajo National Monument, AZ created |
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| 23 | 1910 – Sitka National Historical Park, AK created |
| 24 | |
| 25 | 2013 – Charles Young Buffalo Soldiers National Monument, OH created 2013 – First State National Historical Park, DE created 2013 – Harriet Tubman Underground Railroad National Historical Park, MD created |
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| 28 | 1983 – Natchez Trace National Scenic Trail, MS created 1983 – Potomac Heritage National Scenic Trail, DC, MD, PA, & VA created |
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