diff --git a/pipelines/concourse-workers/pipeline.yml b/pipelines/concourse-workers/pipeline.yml
index aa9a485c3..e5671467e 100644
--- a/pipelines/concourse-workers/pipeline.yml
+++ b/pipelines/concourse-workers/pipeline.yml
@@ -23,6 +23,7 @@ meta:
 
   # GKE account info and which zone the clusters should be created in and deleted from.
   gke_account_params: &gke_account_params
+    CLUSTER_REGION: us-west1
     CLUSTER_ZONE: us-west1-c
     GCP_PROJECT: ((gcp-project-name))
     GCP_SERVICE_ACCOUNT: ((gke-test-pool-manager-username))
diff --git a/pipelines/main/pipeline.yml b/pipelines/main/pipeline.yml
index 580768e4d..b744a1878 100644
--- a/pipelines/main/pipeline.yml
+++ b/pipelines/main/pipeline.yml
@@ -85,7 +85,8 @@ meta:
 
   # GKE account info and which zone the clusters should be created in and deleted from.
   gke_account_params: &gke_account_params
-    CLUSTER_ZONE: us-west1-c
+    # CLUSTER_ZONE: us-west1-c
+    CLUSTER_REGION: us-west1
     GCP_PROJECT: ((gcp-project-name))
     GCP_SERVICE_ACCOUNT: ((gke-test-pool-manager-username))
     GCP_JSON_KEY: ((gke-test-pool-manager-json-key))
diff --git a/pipelines/pull-requests/pipeline.yml b/pipelines/pull-requests/pipeline.yml
index 5c85b171f..4b201e034 100644
--- a/pipelines/pull-requests/pipeline.yml
+++ b/pipelines/pull-requests/pipeline.yml
@@ -73,7 +73,8 @@ meta:
 
   # GKE account info and which zone the clusters should be created in and deleted from.
   gke_account_params: &gke_account_params
-    CLUSTER_ZONE: us-west1-c
+    # CLUSTER_ZONE: us-west1-c
+    CLUSTER_REGION: us-west1
     GCP_PROJECT: ((gcp-project-name))
     GCP_SERVICE_ACCOUNT: ((gke-test-pool-manager-username))
     GCP_JSON_KEY: ((gke-test-pool-manager-json-key))
diff --git a/pipelines/shared-tasks/deploy-gke-cluster/task.sh b/pipelines/shared-tasks/deploy-gke-cluster/task.sh
index 84c671ba2..5be721119 100755
--- a/pipelines/shared-tasks/deploy-gke-cluster/task.sh
+++ b/pipelines/shared-tasks/deploy-gke-cluster/task.sh
@@ -13,13 +13,21 @@ export USE_GKE_GCLOUD_AUTH_PLUGIN=True
 cd deploy-gke-cluster-output
 gcloud auth activate-service-account "$GCP_SERVICE_ACCOUNT" --key-file <(echo "$GCP_JSON_KEY") --project "$GCP_PROJECT"
 
+# Decide if we want a regional or zonal cluster.
+if [[ -n "$CLUSTER_REGION" ]]; then
+  region_or_zone_flag="--region=$CLUSTER_REGION"
+  region_or_zone_suffix="region-$CLUSTER_REGION"
+else
+  region_or_zone_flag="--zone=$CLUSTER_ZONE"
+  region_or_zone_suffix="zone-$CLUSTER_ZONE"
+fi
 
 if [ -n "$KUBE_VERSION" ]; then
   echo
   echo "Trying to use Kubernetes version $KUBE_VERSION"
 
   # Look up the latest GKE version for KUBE_VERSION.
-  GKE_VERSIONS="$(gcloud container get-server-config --zone "$CLUSTER_ZONE" --format json \
+  GKE_VERSIONS="$(gcloud container get-server-config "$region_or_zone_flag" --format json \
     | jq -r '.validMasterVersions[]')"
   echo
   echo "Found all versions of Kubernetes supported by GKE:"
@@ -36,18 +44,18 @@ else
   export VERSION_FLAG="--release-channel=${GKE_CHANNEL:-"regular"}"
 fi
 
-# Include the zone of the cluster in its name. This will allow us to change our preferred zone for new
-# clusters anytime we want, and the existing clusters can still be deleted because the old zone can
+# Include the region or zone of the cluster in its name. This will allow us to change our preferred region/zone for new
+# clusters anytime we want, and the existing clusters can still be deleted because the old region/zone can
 # be parsed out from the cluster name at deletion time.
-CLUSTER_NAME="gke-$(openssl rand -hex 4)-zone-${CLUSTER_ZONE}"
+CLUSTER_NAME="gke-$(openssl rand -hex 4)-${region_or_zone_suffix}"
 
 # The cluster name becomes the name of the lock in the pool.
-echo "$CLUSTER_NAME" > name
+echo "$CLUSTER_NAME" >name
 
 # Start the cluster
 # Note that --enable-network-policy is required to enable NetworkPolicy resources. Otherwise they are ignored.
 gcloud container clusters create "$CLUSTER_NAME" \
-  --zone "$CLUSTER_ZONE" \
+  "$region_or_zone_flag" \
   "$VERSION_FLAG" \
   --num-nodes 1 \
   --machine-type e2-standard-8 \
@@ -67,7 +75,7 @@ gcloud container clusters create "$CLUSTER_NAME" \
   --services-secondary-range-name "pods"
 
 # Get the cluster details back, including the admin certificate:
-gcloud container clusters describe "$CLUSTER_NAME" --zone "$CLUSTER_ZONE" --format json \
+gcloud container clusters describe "$CLUSTER_NAME" "$region_or_zone_flag" --format json \
   > /tmp/cluster.json
 
 # Make a new kubeconfig user "cluster-admin" using the admin cert.
diff --git a/pipelines/shared-tasks/deploy-gke-cluster/task.yml b/pipelines/shared-tasks/deploy-gke-cluster/task.yml
index 63dd39634..5af7cd880 100644
--- a/pipelines/shared-tasks/deploy-gke-cluster/task.yml
+++ b/pipelines/shared-tasks/deploy-gke-cluster/task.yml
@@ -10,6 +10,7 @@ outputs:
 params:
   KUBE_VERSION:
   CLUSTER_ZONE:
+  CLUSTER_REGION:
   GCP_PROJECT:
   GCP_SERVICE_ACCOUNT:
   GCP_JSON_KEY:
diff --git a/pipelines/shared-tasks/remove-gke-cluster/task.sh b/pipelines/shared-tasks/remove-gke-cluster/task.sh
index 8b21b94d7..a62edd102 100755
--- a/pipelines/shared-tasks/remove-gke-cluster/task.sh
+++ b/pipelines/shared-tasks/remove-gke-cluster/task.sh
@@ -9,28 +9,41 @@ CLUSTER_NAME="$(cat gke-cluster-pool/name)"
 export CLUSTER_NAME
 export KUBECONFIG="gke-cluster-pool/metadata"
 
-# Parse the zone name from the cluster name, in case it was created in a different zone
-# compared to the zone in which we are currently creating new clusters.
+# Parse the region or zone name from the cluster name, in case it was created in a different region/zone
+# compared to the region/zone in which we are currently creating new clusters.
 zone=${CLUSTER_NAME##*-zone-}
-# If the zone name was empty, or if there was no zone delimiter in the cluster name to start with...
-if [[ -z $zone || "$CLUSTER_NAME" != *"-zone-"* ]]; then
-  echo "Umm... the cluster name did not contain a zone name."
+region=${CLUSTER_NAME##*-region-}
+
+# If the region/zone name was empty, or if there was no region/zone delimiter in the cluster name to start with...
+if [[ (-z $zone || "$CLUSTER_NAME" != *"-zone-"*) && (-z $region || "$CLUSTER_NAME" != *"-region-"*) ]]; then
+  echo "Umm... the cluster name $CLUSTER_NAME did not contain either region or zone name."
   exit 1
 fi
 
+# Decide if we have a regional or zonal cluster.
+if [[ -n "$region" ]]; then
+  region_or_zone_flag="--region=$region"
+else
+  region_or_zone_flag="--zone=$zone"
+fi
+
 gcloud auth activate-service-account "$GCP_SERVICE_ACCOUNT" --key-file <(echo "$GCP_JSON_KEY") --project "$GCP_PROJECT"
 
 for i in $(seq 1 10); do
   echo "Checking $CLUSTER_NAME for ongoing operations (iteration $i)...."
-  running_ops=$(gcloud container operations list --filter="targetLink:$CLUSTER_NAME AND status != done" --project "$GCP_PROJECT" --zone "$zone" --format yaml)
+  running_ops=$(gcloud container operations list \
+    --filter="targetLink:$CLUSTER_NAME AND status != done" \
+    --project "$GCP_PROJECT" "$region_or_zone_flag" --format yaml)
   if [[ -z "$running_ops" ]]; then
+    echo
     break
   fi
   echo "Found a running cluster operation:"
   echo "$running_ops"
+  echo
   # Give some time for the operation to finsh before checking again.
   sleep 30
 done
 
 echo "Removing $CLUSTER_NAME..."
-gcloud container clusters delete "$CLUSTER_NAME" --zone "$zone" --quiet
+gcloud container clusters delete "$CLUSTER_NAME" "$region_or_zone_flag" --quiet
diff --git a/pipelines/shared-tasks/remove-orphaned-gke-clusters/task.sh b/pipelines/shared-tasks/remove-orphaned-gke-clusters/task.sh
index 0cb05ec50..fbd1d84c5 100755
--- a/pipelines/shared-tasks/remove-orphaned-gke-clusters/task.sh
+++ b/pipelines/shared-tasks/remove-orphaned-gke-clusters/task.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright 2024 the Pinniped contributors. All Rights Reserved.
+# Copyright 2024-2025 the Pinniped contributors. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 # Sometimes something goes wrong with a GKE test job's cleanup and a
@@ -11,7 +11,8 @@
 # 1. Are running in GCP with a name that indicates that it was auto-created for testing,
 # 2. And are older than some number of hours since their creation time.
 #
-# Params are CLUSTER_ZONE, GCP_PROJECT, GCP_SERVICE_ACCOUNT, and GCP_JSON_KEY.
+# Params are CLUSTER_REGION, CLUSTER_ZONE, GCP_PROJECT, GCP_SERVICE_ACCOUNT, and GCP_JSON_KEY.
+# Search for both zonal and regional orphaned clusters.
 
 set -euo pipefail
 
@@ -20,17 +21,23 @@ gcloud auth activate-service-account \
   --key-file <(echo "$GCP_JSON_KEY") \
   --project "$GCP_PROJECT"
 
-all_cloud=($(gcloud container clusters list \
+all_zonal=($(gcloud container clusters list \
   --zone "$CLUSTER_ZONE" --project "$GCP_PROJECT" \
   --filter "name~gke-[a-f0-9]+-zone-${CLUSTER_ZONE}" --format 'table[no-heading](name)' | sort))
 
+all_regional=($(gcloud container clusters list \
+  --region "$CLUSTER_REGION" --project "$GCP_PROJECT" \
+  --filter "name~gke-[a-f0-9]+-region-${CLUSTER_REGION}" --format 'table[no-heading](name)' | sort))
+
 now_in_seconds_since_epoch=$(date +"%s")
 hours_ago_to_delete=2
-clusters_to_remove=()
+regional_clusters_to_remove=()
+zonal_clusters_to_remove=()
 
 echo
 echo "All auto-created GKE clusters (with creation time in UTC):"
-for i in "${all_cloud[@]}"; do
+
+for i in "${all_zonal[@]}"; do
   creation_time=$(gcloud container clusters describe "$i" \
     --zone "$CLUSTER_ZONE" --project "$GCP_PROJECT" \
     --format 'table[no-heading](createTime.date(tz=UTC))')
@@ -39,7 +46,7 @@ for i in "${all_cloud[@]}"; do
     # Note: on MacOS this date command would be: date -ju -f '%Y-%m-%dT%H:%M:%S' "$creation_time" '+%s'
     creation_time_seconds_since_epoch=$(date -u -d "$creation_time" '+%s')
     if (($((now_in_seconds_since_epoch - creation_time_seconds_since_epoch)) > $((hours_ago_to_delete * 60 * 60)))); then
-      clusters_to_remove+=("$i")
+      zonal_clusters_to_remove+=("$i")
       echo "$i $creation_time (older than $hours_ago_to_delete hours)"
     else
       echo "$i $creation_time (less than $hours_ago_to_delete hours old)"
@@ -49,16 +56,45 @@ for i in "${all_cloud[@]}"; do
     exit 1
   fi
 done
-if [[ ${#all_cloud[@]} -eq 0 ]]; then
+
+for i in "${all_regional[@]}"; do
+  creation_time=$(gcloud container clusters describe "$i" \
+    --region "$CLUSTER_REGION" --project "$GCP_PROJECT" \
+    --format 'table[no-heading](createTime.date(tz=UTC))')
+  # UTC date format example: 2022-04-01T17:01:59
+  if [[ "$creation_time" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}$ ]]; then
+    # Note: on MacOS this date command would be: date -ju -f '%Y-%m-%dT%H:%M:%S' "$creation_time" '+%s'
+    creation_time_seconds_since_epoch=$(date -u -d "$creation_time" '+%s')
+    if (($((now_in_seconds_since_epoch - creation_time_seconds_since_epoch)) > $((hours_ago_to_delete * 60 * 60)))); then
+      regional_clusters_to_remove+=("$i")
+      echo "$i $creation_time (older than $hours_ago_to_delete hours)"
+    else
+      echo "$i $creation_time (less than $hours_ago_to_delete hours old)"
+    fi
+  else
+    echo "GKE cluster creation time not in expected time format: $creation_time"
+    exit 1
+  fi
+done
+
+if [[ ${#all_zonal[@]} -eq 0 && ${#all_regional[@]} -eq 0 ]]; then
   echo "none"
 fi
 
 echo
-if [[ ${#clusters_to_remove[@]} -eq 0 ]]; then
-  echo "No old orphaned GKE clusters found to remove."
+if [[ ${#zonal_clusters_to_remove[@]} -eq 0 ]]; then
+  echo "No old orphaned zonal GKE clusters found to remove."
 else
-  echo "Removing ${#clusters_to_remove[@]} GKE clusters(s) which are older than $hours_ago_to_delete hours in $CLUSTER_ZONE: ${clusters_to_remove[*]} ..."
-  gcloud container clusters delete --zone "${CLUSTER_ZONE}" --quiet ${clusters_to_remove[*]}
+  echo "Removing ${#zonal_clusters_to_remove[@]} GKE clusters(s) which are older than $hours_ago_to_delete hours in $CLUSTER_ZONE: ${zonal_clusters_to_remove[*]} ..."
+  gcloud container clusters delete --zone "${CLUSTER_ZONE}" --quiet ${zonal_clusters_to_remove[*]}
+fi
+
+echo
+if [[ ${#regional_clusters_to_remove[@]} -eq 0 ]]; then
+  echo "No old orphaned regional GKE clusters found to remove."
+else
+  echo "Removing ${#regional_clusters_to_remove[@]} GKE clusters(s) which are older than $hours_ago_to_delete hours in $CLUSTER_REGION: ${regional_clusters_to_remove[*]} ..."
+  gcloud container clusters delete --region "${CLUSTER_REGION}" --quiet ${regional_clusters_to_remove[*]}
 fi
 
 echo
diff --git a/pipelines/shared-tasks/remove-orphaned-gke-clusters/task.yml b/pipelines/shared-tasks/remove-orphaned-gke-clusters/task.yml
index dd28a386f..e7d03968e 100644
--- a/pipelines/shared-tasks/remove-orphaned-gke-clusters/task.yml
+++ b/pipelines/shared-tasks/remove-orphaned-gke-clusters/task.yml
@@ -1,4 +1,4 @@
-# Copyright 2020-2024 the Pinniped contributors. All Rights Reserved.
+# Copyright 2020-2025 the Pinniped contributors. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 ---
@@ -7,6 +7,7 @@ inputs:
   - name: pinniped-ci
 outputs:
 params:
+  CLUSTER_REGION:
   CLUSTER_ZONE:
   GCP_PROJECT:
   GCP_SERVICE_ACCOUNT: