diff --git a/zuul.d/project-templates.yaml b/zuul.d/project-templates.yaml
index 73ffa95c..d0f57b32 100644
--- a/zuul.d/project-templates.yaml
+++ b/zuul.d/project-templates.yaml
@@ -1871,12 +1871,22 @@
       repositories in the integrated gate.
     check:
       jobs:
-        - grenade
+        - grenade:
+            # NOTE(gmann): Do not run the grenade job for
+            # Extended Maintainance or oldest stable branch.
+            # We need to upate this list when any stable
+            # is moved to Extended Maintainance state.
+            branches: ^(?!(stable/(ocata|pike|queens|rocky|stein))).*$
         - tempest-full-py3:
             branches: ^(?!(stable/(newton|ocata|pike)|driverfixes)).*$
     gate:
       jobs:
-        - grenade
+        - grenade:
+            # NOTE(gmann): Do not run the grenade job for
+            # Extended Maintainance or oldest stable branch.
+            # We need to upate this list when any stable
+            # is moved to Extended Maintainance state.
+            branches: ^(?!(stable/(ocata|pike|queens|rocky|stein))).*$
         - tempest-full-py3:
             branches: ^(?!(stable/(newton|ocata|pike)|driverfixes)).*$
 
diff --git a/zuul.d/zuul-legacy-project-templates.yaml b/zuul.d/zuul-legacy-project-templates.yaml
index 613d2b87..c07fb461 100644
--- a/zuul.d/zuul-legacy-project-templates.yaml
+++ b/zuul.d/zuul-legacy-project-templates.yaml
@@ -18,14 +18,22 @@
             branches: ^stable/(newton|ocata)$
         - tempest-full
         - neutron-grenade:
-            branches: ^stable/(pike|queens|rocky|stein|train).*$
+            # NOTE(gmann): Do not run the grenade job for
+            # Extended Maintainance or oldest stable branch.
+            # Now this is only needed for stable/train as
+            # stable/ussuri onwards we use integrated-gate-py3.
+            branches: stable/train
     gate:
       jobs:
         - legacy-tempest-dsvm-neutron-full:
             branches: ^stable/(newton|ocata)$
         - tempest-full
         - neutron-grenade:
-            branches: ^stable/(pike|queens|rocky|stein|train).*$
+            # NOTE(gmann): Do not run the grenade job for
+            # Extended Maintainance or oldest stable branch.
+            # Now this is only needed for stable/train as
+            # stable/ussuri onwards we use integrated-gate-py3.
+            branches: stable/train
 
 - project-template:
     name: puppet-module-unit-jobs