Last Updated on 22 September 2023
| October | Events |
| 1 | 1890 – Kings Canyon National Park, CA created 1890 – Yosemite National Park, CA created 1974 – Boston National Historical Park, MA created |
| 2 | 1968 – Appalachian National Scenic Trail, ME created 1968 – Lake Chelan National Recreation Area, WA created 1968 – North Cascades National Park, WA created 1968 – Redwood National Park, CA created 1968 – Ross Lake National Recreation Area, WA created 1968 – Saint Croix National Scenic Riverway, WI created 1989 – Ulysses S. Grant National Historic Site, MO created |
| 3 | |
| 4 | 1915 – Dinosaur National Monument, CO created 1961 – Piscataway Park, MD created |
| 5 | |
| 6 | |
| 7 | 1988 – Natchez National Historical Park, MS created |
| 8 | 1964 – Lake Mead National Recreation Area, AZ & NV created 1975 – John Day Fossil Beds National Monument, OR created 2012 – Caesar Chavez National Monument, CA created |
| 9 | 1972 – Longfellow House–Washington’s Headquarters National Historic Site, MA created |
| 10 | 1792 – White House (Presidents Park), DC created 1980 – Boston African American National Historic Site, MA created 1980 – Martin Luther King, Junior, National Historic Site, GA created |
| 11 | 1974 – Big Cypress National Preserve, FL created 1974 – Big Thicket National Preserve, TX created 2000 – First Ladies National Historic Site, OH created |
| 12 | 1976 – Obed National Wild & Scenic River, TN created 1979 – Frederick Law Olmsted National Historic Site, MA created |
| 13 | |
| 14 | 1913 – Cabrillo National Monument, CA created 1922 – Timpanogos Cave, UT created |
| 15 | 1924 – Castillo de San Marcos National Monument, FL created 1924 – Fort Matanzas National Monument, FL created 1924 – Fort Pulaski, GA created 1966 – Bighorn Canyon National Recreation Area, MT & WY created 1966 – Guadalupe Mountains National Park, TX created 1966 – Horseshoe Bend National Military Park listed in National Register of Historic Places 1966 – Pictured Rocks National Lakeshore, MI created 1966 – Wolf Trap National Park for the Performing Arts, VA created |
| 16 | 1970 – Andersonville National Historic Site, GA created 1970 – Fort Point National Historic Site, CA created 1992 – Dayton Aviation Heritage National Historical Park, OH created |
| 17 | 1968 – Carl Sandburg Home National Historic Site, NC created |
| 18 | 1968 – Biscayne National Park, FL created 1976 – Congaree National Park, SC created 1976 – Eugene O’Neill National Historic Site, CA created |
| 19 | 1978 – Fort Scott National Historic Site, KS created |
| 20 | |
| 21 | 1970 – Sleeping Bear Dunes National Lakeshore, MI created 1972 – Hohokam Pima National Monument, AZ created 1972 – Thaddeus Kosciuszko National Memorial, PA created 1992 – Little River Canyon National Preserve, AL created |
| 22 | 1965 – Roger Williams National Memorial, RI created 2010 – River Raisin National Battlefield Park, MI created |
| 23 | 1972 – Cumberland Island National Seashore, GA created 1972 – Fossil Butte National Monument, WY created |
| 24 | 2000 – Rosie the Riveter WWII Home Front National Historical Park, CA created |
| 25 | 1923 – Carlsbad Caverns National Park, NM created 1949 – Effigy Mounds National Monument, IA created |
| 26 | 1974 – Clara Barton National Historic Site, MD created 1974 – Knife River Indian Villages National Historic Site, ND created 1974 – Martin Van Buren National Historic Site, NY created 1974 – Springfield Armory National Historic Site, MA created 1974 – Tuskegee Institute National Historic Site, AL created 1992 – Brown v. Board of Education National Historic Site, KS created 1992 – Dry Tortugas National Park, FL created 2018 – Camp Nelson National Monument, KY created |
| 27 | 1972 – Gateway National Recreation Area, NY created 1972 – Golden Gate National Recreation Area, CA created 1992 – Great Egg Harbor Scenic and Recreational River, NJ created 1992 – Keweenaw National Historical Park, MI created |
| 28 | 1986 – Korean War Veterans Memorial, DC created 2009 – Port Chicago Naval Magazine National Memorial, CA created |
| 29 | |
| 30 | 1986 – Steamtown National Historic Site, PA created 2020 – Ste. Genevieve National Historical Park, MO created |
| 31 | 1988 – National Park of American Samoa, AS created 1988 – Poverty Point National Monument, LA created 1990 – Weir Farm National Historical Park, CT created 1994 – Mojave National Preserve, CA created 1994 – New Orleans Jazz National Historical Park, LA created |
