diff --git a/db/migrate/20221006193737_backfill_procedures_zones.rb b/db/migrate/20221006193737_backfill_procedures_zones.rb
new file mode 100644
index 000000000..9564cb51b
--- /dev/null
+++ b/db/migrate/20221006193737_backfill_procedures_zones.rb
@@ -0,0 +1,17 @@
+class BackfillProceduresZones < ActiveRecord::Migration[6.1]
+  def up
+    # rubocop:disable DS/Unscoped
+    Procedure.unscoped.each do |procedure|
+      procedure.zones << procedure.zone if procedure.zone
+    end
+    # rubocop:enable DS/Unscoped
+  end
+
+  def down
+    # rubocop:disable DS/Unscoped
+    Procedure.unscoped.each do |procedure|
+      procedure.zones.destroy_all
+    end
+    # rubocop:enable DS/Unscoped
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index c1f5852cc..1374cdb79 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2022_10_06_190110) do
+ActiveRecord::Schema.define(version: 2022_10_06_193737) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"