diff --git a/octavia/controller/worker/v2/flows/listener_flows.py b/octavia/controller/worker/v2/flows/listener_flows.py
index ae22835a96..cc80d8484b 100644
--- a/octavia/controller/worker/v2/flows/listener_flows.py
+++ b/octavia/controller/worker/v2/flows/listener_flows.py
@@ -60,6 +60,9 @@ class ListenerFlows(object):
             requires=constants.LOADBALANCER_ID))
         create_all_listeners_flow.add(network_tasks.UpdateVIP(
             requires=constants.LISTENERS))
+        create_all_listeners_flow.add(
+            database_tasks.MarkHealthMonitorsOnlineInDB(
+                requires=constants.LOADBALANCER))
         return create_all_listeners_flow
 
     def get_delete_listener_flow(self):
diff --git a/octavia/controller/worker/v2/tasks/database_tasks.py b/octavia/controller/worker/v2/tasks/database_tasks.py
index 76cc30c988..4e78a04ba3 100644
--- a/octavia/controller/worker/v2/tasks/database_tasks.py
+++ b/octavia/controller/worker/v2/tasks/database_tasks.py
@@ -1915,6 +1915,39 @@ class MarkHealthMonitorPendingUpdateInDB(BaseDatabaseTask):
             health_mon[constants.HEALTHMONITOR_ID])
 
 
+class MarkHealthMonitorsOnlineInDB(BaseDatabaseTask):
+    """Mark all enabled health monitors Online
+
+    :param loadbalancer: Dictionary of a Load Balancer that has associated
+           health monitors
+    :returns: None
+    """
+
+    def execute(self, loadbalancer: dict):
+        db_lb = self.loadbalancer_repo.get(
+            db_apis.get_session(),
+            id=loadbalancer[constants.LOADBALANCER_ID])
+
+        # Update the healthmonitors of either attached listeners or l7policies
+        hms_to_update = []
+
+        for listener in db_lb.listeners:
+            if listener.default_pool and listener.default_pool.health_monitor:
+                hm = listener.default_pool.health_monitor
+                if hm.enabled:
+                    hms_to_update.append(hm.id)
+            for l7policy in listener.l7policies:
+                if l7policy.redirect_pool and (
+                        l7policy.redirect_pool.health_monitor):
+                    hm = l7policy.redirect_pool.health_monitor
+                    if hm.enabled:
+                        hms_to_update.append(hm.id)
+
+        for hm_id in hms_to_update:
+            self.health_mon_repo.update(db_apis.get_session(), hm_id,
+                                        operating_status=constants.ONLINE)
+
+
 class MarkL7PolicyActiveInDB(BaseDatabaseTask):
     """Mark the l7policy ACTIVE in the DB.
 
diff --git a/octavia/tests/unit/controller/worker/v2/tasks/test_database_tasks.py b/octavia/tests/unit/controller/worker/v2/tasks/test_database_tasks.py
index 99faa6a69f..0a47e55f97 100644
--- a/octavia/tests/unit/controller/worker/v2/tasks/test_database_tasks.py
+++ b/octavia/tests/unit/controller/worker/v2/tasks/test_database_tasks.py
@@ -2140,6 +2140,53 @@ class TestDatabaseTasks(base.TestCase):
             id=HM_ID,
             provisioning_status=constants.ERROR)
 
+    @mock.patch('octavia.db.repositories.LoadBalancerRepository.get')
+    @mock.patch('octavia.db.repositories.HealthMonitorRepository.update')
+    def test_mark_health_monitors_online_in_db(self,
+                                               mock_health_mon_repo_update,
+                                               mock_loadbalancer_repo_get,
+                                               mock_generate_uuid,
+                                               mock_LOG,
+                                               mock_get_session,
+                                               mock_loadbalancer_repo_update,
+                                               mock_listener_repo_update,
+                                               mock_amphora_repo_update,
+                                               mock_amphora_repo_delete):
+        # Creating a mock hm for a default pool
+        mock_lb = mock.MagicMock()
+        mock_listener = mock.MagicMock()
+        mock_default_pool = mock_listener.default_pool
+        mock_hm_def_pool = mock_default_pool.health_monitor
+        mock_hm_def_pool.id = uuidutils.generate_uuid()
+        mock_lb.listeners = [mock_listener]
+
+        # Creating a mock hm for a redirect pool of an l7policy
+        mock_l7policy = mock.MagicMock()
+        mock_redirect_pool = mock_l7policy.redirect_pool
+        mock_hm_l7_policy = mock_redirect_pool.health_monitor
+        mock_hm_l7_policy.id = uuidutils.generate_uuid()
+        mock_listener.l7policies = [mock_l7policy]
+
+        # Creating a mock hm for a non default pool - we check its health
+        # monitor won't be updated
+        mock_pool = mock.MagicMock()
+        mock_hm_non_def_pool = mock_pool.health_monitor
+        mock_hm_non_def_pool.id = uuidutils.generate_uuid()
+        mock_lb.pools = [mock_pool]
+
+        mock_loadbalancer_repo_get.return_value = mock_lb
+        mark_health_mon_online = (database_tasks.
+                                  MarkHealthMonitorsOnlineInDB())
+        mark_health_mon_online.execute(mock_lb)
+
+        mock_session = 'TEST'
+        for mock_id in [mock_hm_def_pool.id, mock_hm_l7_policy.id]:
+            mock_health_mon_repo_update.assert_called_with(
+                mock_session,
+                mock_id,
+                operating_status=constants.ONLINE)
+        self.assertEqual(2, mock_health_mon_repo_update.call_count)
+
     @mock.patch('octavia.db.repositories.L7PolicyRepository.update')
     @mock.patch('octavia.db.repositories.L7PolicyRepository.get')
     def test_mark_l7policy_active_in_db(self,
diff --git a/releasenotes/notes/fix-hm-operating-status-online-in-single-lb-call-214a7ca22937a877.yaml b/releasenotes/notes/fix-hm-operating-status-online-in-single-lb-call-214a7ca22937a877.yaml
new file mode 100644
index 0000000000..5e5a892514
--- /dev/null
+++ b/releasenotes/notes/fix-hm-operating-status-online-in-single-lb-call-214a7ca22937a877.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixed a bug that didn't set all the active load balancer Health Monitors
+    ONLINE in populated LB single-create calls.