Preheat oven to 400℉.
Prepare the crust: Roll out one pie crust and place it into a 9-inch pie dish. Trim edges to fit and refrigerate while you make the filling.
Make the filling: In a large bowl, stir together blueberries, sugar, cornstarch, lemon juice, lemon zest, cinnamon, and salt until evenly coated.
Assemble the pie: Pour the filling into the chilled crust and dot the top with butter.
Add the lattice: Roll out the second crust, cut into strips, and weave over the filling. Trim, tuck, and crimp the edges. Bake: Place pie on a baking sheet (to catch drips) and bake 45-55 minutes, or until the crust is golden and the filling bubbling in the center.
Cool: Let the pie cool for at least 2 hours before slicing so the filling can set.