Halloween is celebrated not only on October 31st, but also as a holiday "season". Usually the entire month of October is set aside to celebrate and St. Louis puts out the orange and black decorations.
The many pumpkin patches in the area provides Halloween family fun during October. Thies Farm has a "Pumpkin Land" at their North and West locations which feature corn mazes, the Pumpkin Land play area, pony rides, face painting and more! Rombach Farms in Chesterfield is known for its pumpkin patch and offers hay rides, their "Great Pumpkin Pyramid", the Country Store and more. For more Halloween fun, in the month of October, Six Flags turns the entire park into one big Halloween party called "Fright Fest." The park is only open on weekends, Friday night through Sunday night, and encourages parents to bring younger children during the day to experience the "Thrills by Day" and teens and adults to stay after 6pm for the "Fright by Night." The St. Louis Zoo celebrates Halloween, too with their "Boo at the Zoo" which is held nightly for about a week before October 31st.
And what would Halloween be without ghosts and haunted houses? For those who enjoy the thrills of the paranormal of the historical type, Historic Alton Illinois is recognized as one of the most haunted small towns in the nation. Several haunted tours are offered throughout the year, but Halloween makes it a perfect fun thing to do! The Lemp Mansion in Downtown St. Louis was home to the wealthy Lemp family who owned the Lemp Brewery. Today it is a Bed & Breakfast and restaurant and is reported to be haunted! "Paranormal Tours" are given at the mansion as well as other spooky events throughout October. The Payne-Gentry House in Bridgeton Missouri is also known to be haunted. The Bridgeton Parks and Rec Department gives tours of the historical home of Elbridge Payne and his family, but you will have to find your own ghosts! Thornhill Mansion at Thornhill Farm, home to Missouri's second governor, Frederick Bates, is located in Faust Park and is said to be haunted by the Governor himself!