Preheat the oven to 350 degrees. Spray a 9 inch pie plate with non-stick cooking spray and set it aside.
Place the graham crackers in a large Ziploc bag and seal it. Using a rolling pin, crush the graham crackers into fine crumbs. You can also use a food processor if you prefer. (See Tips, Tricks, and FAQs for a no-bake crust tip).
Add the grahham cracker crumbs into a medium-sized bowl with the melted butter, cinnamon, and brown sugar. Combine the ingredients together. Press the crust mixture into the pie plate.
Bake the crust in the oven for about 8 to 10 minutes, or until lightly browned. Remove from oven allow to cool before filling it with the lemonade mixture.
In a large mixing bowl, combine the whipped topping, vanilla extract, ice cream, lemonade concentrate, lemon extract, and mix everything together.
Spread into the prepared pie crust. An offset spatula helps to smooth out the filling.
Place into the freezer and allow the pie to chill and set. This will about take at least 6 hours. To serve, remove from freezer and allow the pie to sit out for 10 minutes. Using a sharp knife that has been soaking in hot water will help slice the pie easier. Top with whipped cream if desired.