diff --git a/extraconfig/post_deploy/undercloud_ctlplane_network.py b/extraconfig/post_deploy/undercloud_ctlplane_network.py
index 387a1d0adb..df29ed3482 100755
--- a/extraconfig/post_deploy/undercloud_ctlplane_network.py
+++ b/extraconfig/post_deploy/undercloud_ctlplane_network.py
@@ -205,6 +205,7 @@ def _local_neutron_segments_and_subnets(sdk, ctlplane_id, net_cidrs):
     segment = _get_segment(sdk, CONF['physical_network'], ctlplane_id)
     host_routes = [{'destination': '169.254.169.254/32',
                     'nexthop': CONF['local_ip']}]
+    host_routes += s['HostRoutes']
     if subnet:
         if CONF['enable_routed_networks'] and subnet.segment_id == None:
             # The subnet exists and does not have a segment association. Since
@@ -245,6 +246,7 @@ def _remote_neutron_segments_and_subnets(sdk, ctlplane_id, net_cidrs):
         metadata_nexthop = s['NetworkGateway']
         host_routes = [{'destination': '169.254.169.254/32',
                         'nexthop': metadata_nexthop}]
+        host_routes += s['HostRoutes']
         subnet = _get_subnet(sdk, s['NetworkCidr'], ctlplane_id)
         segment = _get_segment(sdk, phynet, ctlplane_id)
         if subnet:
diff --git a/releasenotes/notes/ctlplane-undercloud-conf-host-routes-00e981d1f00405d8.yaml b/releasenotes/notes/ctlplane-undercloud-conf-host-routes-00e981d1f00405d8.yaml
new file mode 100644
index 0000000000..ba5606b649
--- /dev/null
+++ b/releasenotes/notes/ctlplane-undercloud-conf-host-routes-00e981d1f00405d8.yaml
@@ -0,0 +1,12 @@
+---
+features:
+  - |
+    A new option ``host_routes`` are now available for subnet defenitions in
+    ``undercloud.conf``.
+
+    - Host routes specified for the *local_subnet* will be added to
+      the routing table on the Undercloud.
+    - Host routes for *all* subnets are passed to tripleo-heat-templates so
+      that the *host_routes* property of the ctlplane subnets are set
+      accordingly when installing the Undercloud.
+