Since Thanksgiving is toward the end of the fall season, a lot of items you decorate with can be shared between both Halloween and Thanksgiving holidays. This means you won't want to spend a lot of money or time on new fall decor specifically for Turkey Day, especially since you'll be dying to decorate for Christmas before the leftovers are even put away. Because of this, it's recommended to add traditional fall decor to your front porch at the start of the fall season and take away and add as you go (via Houzz).
For example, begin the fall season by adding pumpkins, a simple wreath, lights, corn stalks, and/or potted plants to your porch. Strategically place a few pumpkins by the front door or down the entryway. Then, add smaller accessories like hay bales, gourds, and dried corn stalks nearby (via Food52). You can also string some lights or place some lanterns for a cozy feel.
Once October is over, it's important to remove any spooky Halloween-related decorations and replace them with a Thanksgiving-related doormat, pillows, and throw blankets for your front porch swing or other furniture. While turkey decor tends to look tacky, per Homes & Gardens, adding a small turkey figurine on your front porch won't hurt if you simply can't help yourself. Remember, a little goes a long way!