Preheat the oven to 400 degrees F. Line a sheet pan with parchment paper.
Mix the blueberries, 1/2 cup of sugar, the flour, lemon zest, and lemon juice in a large bowl.
Carefully ease pie crust into a 9-inch pie plate, making sure not to stretch the dough at all, or it will shrink as the pie bakes. With a sharp knife, cut the excess dough off at the edge of the pie plate.
Spoon the blueberry mixture into the pie shell, scraping the bowl with a rubber spatula to be sure you have all the juices.
Crimp the edges of the pie crust with your fingers.
Spoon half of the crumb topping mixture on top of the blueberries, covering the entire pan.
Set the pie pan on the parchment-lined baking pan.
Bake at 400 degrees F. for 45 minutes on the middle rack until the filling is very bubbly and the crust is nicely browned. (I like to check my pie 10 minutes or so prior to make sure the crust isn't too brown. If it is, cover the top loosely with foil for the rest of the baking time.)