diff --git a/openstack_releases/cmds/validate.py b/openstack_releases/cmds/validate.py
index 3d5de8ef29..c9dbb49076 100644
--- a/openstack_releases/cmds/validate.py
+++ b/openstack_releases/cmds/validate.py
@@ -251,6 +251,40 @@ def validate_series_final(deliv, context):
             print('OK')
 
 
+@applies_to_current
+@applies_to_released
+@applies_to_cycle
+def validate_series_post_final(deliv, context):
+    "After a final release, releases should not use pre-release versions."
+
+    releases = deliv.releases
+    if len(releases) < 2:
+        # We only have to check this when the first release is being
+        # applied in the file.
+        print('this rule only applies if a series has multiple releases')
+        return
+
+    current_release = releases[-1]
+
+    if not current_release.is_pre_release_version:
+        print('this rule only applies if the new '
+              'release has a pre-release version')
+        return
+
+    # If there is a final release version in any of the previous
+    # releases, report the error.
+    for previous_release in releases[-2::-1]:
+        if not previous_release.is_pre_release_version:
+            context.error(
+                '{} uses a pre-release version number '
+                'after a final release version was tagged as {}'.format(
+                    current_release.version, previous_release.version)
+            )
+            return
+
+    print('OK')
+
+
 def validate_bugtracker(deliv, context):
     "Does the bug tracker info link to something that exists?"
     lp_name = deliv.launchpad_id
@@ -1443,6 +1477,7 @@ def main():
             validate_series_open,
             validate_series_first,
             validate_series_final,
+            validate_series_post_final,
             validate_branch_prefixes,
             validate_stable_branches,
             validate_feature_branches,
diff --git a/openstack_releases/deliverable.py b/openstack_releases/deliverable.py
index 2b47e560ce..5956d686b3 100644
--- a/openstack_releases/deliverable.py
+++ b/openstack_releases/deliverable.py
@@ -284,6 +284,14 @@ class Release(object):
     def is_release_candidate(self):
         return 'rc' in self.version
 
+    @property
+    def is_pre_release_version(self):
+        return (
+            'rc' in self.version
+            or 'a' in self.version
+            or 'b' in self.version
+        )
+
     def __eq__(self, other):
         return self.version == other.version
 
diff --git a/openstack_releases/tests/test_validate.py b/openstack_releases/tests/test_validate.py
index 4df3727dbd..6190cdda4a 100644
--- a/openstack_releases/tests/test_validate.py
+++ b/openstack_releases/tests/test_validate.py
@@ -2790,6 +2790,173 @@ class TestValidateSeriesFinal(base.BaseTestCase):
         self.assertEqual(1, len(self.ctx.errors))
 
 
+class TestValidatePostSeriesFinal(base.BaseTestCase):
+
+    def setUp(self):
+        super().setUp()
+        self.tmpdir = self.useFixture(fixtures.TempDir()).path
+        self.ctx = validate.ValidationContext()
+
+    def test_no_releases(self):
+        deliverable_data = yamlutils.loads(textwrap.dedent('''
+        ---
+        team: Release Management
+        '''))
+        deliv = deliverable.Deliverable(
+            None,
+            defaults.RELEASE,
+            'test',
+            deliverable_data,
+        )
+        validate.validate_series_post_final(
+            deliv,
+            self.ctx,
+        )
+        self.ctx.show_summary()
+        self.assertEqual(0, len(self.ctx.warnings))
+        self.assertEqual(0, len(self.ctx.errors))
+
+    def test_only_rc(self):
+        deliverable_data = yamlutils.loads(textwrap.dedent('''
+        ---
+        team: Release Management
+        releases:
+          - version: 1.5.1.0rc1
+            projects:
+              - repo: openstack/automaton
+                hash: be2885f544637e6ee6139df7dc7bf937925804dd
+        '''))
+        deliv = deliverable.Deliverable(
+            None,
+            defaults.RELEASE,
+            'test',
+            deliverable_data,
+        )
+        validate.validate_series_post_final(
+            deliv,
+            self.ctx,
+        )
+        self.ctx.show_summary()
+        self.assertEqual(0, len(self.ctx.warnings))
+        self.assertEqual(0, len(self.ctx.errors))
+
+    def test_no_rc(self):
+        deliverable_data = yamlutils.loads(textwrap.dedent('''
+        ---
+        team: Release Management
+        releases:
+          - version: 1.5.1
+            projects:
+              - repo: openstack/automaton
+                hash: be2885f544637e6ee6139df7dc7bf937925804dd
+          - version: 1.5.2
+            projects:
+              - repo: openstack/automaton
+                hash: ce2885f544637e6ee6139df7dc7bf937925804dd
+        '''))
+        deliv = deliverable.Deliverable(
+            None,
+            defaults.RELEASE,
+            'test',
+            deliverable_data,
+        )
+        validate.validate_series_post_final(
+            deliv,
+            self.ctx,
+        )
+        self.ctx.show_summary()
+        self.assertEqual(0, len(self.ctx.warnings))
+        self.assertEqual(0, len(self.ctx.errors))
+
+    def test_final_follows_rc(self):
+        deliverable_data = yamlutils.loads(textwrap.dedent('''
+        ---
+        team: Release Management
+        releases:
+          - version: 1.5.0.0rc1
+            projects:
+              - repo: openstack/automaton
+                hash: be2885f544637e6ee6139df7dc7bf937925804dd
+          - version: 1.5.0
+            projects:
+              - repo: openstack/automaton
+                hash: ce2885f544637e6ee6139df7dc7bf937925804dd
+        '''))
+        deliv = deliverable.Deliverable(
+            None,
+            defaults.RELEASE,
+            'test',
+            deliverable_data,
+        )
+        validate.validate_series_post_final(
+            deliv,
+            self.ctx,
+        )
+        self.ctx.show_summary()
+        self.assertEqual(0, len(self.ctx.warnings))
+        self.assertEqual(0, len(self.ctx.errors))
+
+    def test_final_follows_multiple_rc(self):
+        deliverable_data = yamlutils.loads(textwrap.dedent('''
+        ---
+        team: Release Management
+        releases:
+          - version: 1.5.0.0rc1
+            projects:
+              - repo: openstack/automaton
+                hash: be2885f544637e6ee6139df7dc7bf937925804dd
+          - version: 1.5.0.0rc2
+            projects:
+              - repo: openstack/automaton
+                hash: be2885f544637e6ee6139df7dc7bf937925804dd
+          - version: 1.5.0
+            projects:
+              - repo: openstack/automaton
+                hash: ce2885f544637e6ee6139df7dc7bf937925804dd
+        '''))
+        deliv = deliverable.Deliverable(
+            None,
+            defaults.RELEASE,
+            'test',
+            deliverable_data,
+        )
+        validate.validate_series_post_final(
+            deliv,
+            self.ctx,
+        )
+        self.ctx.show_summary()
+        self.assertEqual(0, len(self.ctx.warnings))
+        self.assertEqual(0, len(self.ctx.errors))
+
+    def test_rc_follows_final(self):
+        deliverable_data = yamlutils.loads(textwrap.dedent('''
+        ---
+        team: Release Management
+        releases:
+          - version: 1.5.0
+            projects:
+              - repo: openstack/automaton
+                hash: be2885f544637e6ee6139df7dc7bf937925804dd
+          - version: 1.5.0.0rc1
+            projects:
+              - repo: openstack/automaton
+                hash: ce2885f544637e6ee6139df7dc7bf937925804dd
+        '''))
+        deliv = deliverable.Deliverable(
+            None,
+            defaults.RELEASE,
+            'test',
+            deliverable_data,
+        )
+        validate.validate_series_post_final(
+            deliv,
+            self.ctx,
+        )
+        self.ctx.show_summary()
+        self.assertEqual(0, len(self.ctx.warnings))
+        self.assertEqual(1, len(self.ctx.errors))
+
+
 class TestValidateBranchPoints(base.BaseTestCase):
 
     def setUp(self):