diff --git a/.github/workflows/cloud-dispatch-build.yaml b/.github/workflows/cloud-dispatch-build.yaml
index 16bb04c768..a681efa8b0 100644
--- a/.github/workflows/cloud-dispatch-build.yaml
+++ b/.github/workflows/cloud-dispatch-build.yaml
@@ -46,18 +46,35 @@ jobs:
           EVENT_NAME: ${{ github.event_name }}
           PR_HEAD_SHA: ${{ github.event.pull_request.head.sha }}
           PR_HEAD_REF: ${{ github.event.pull_request.head.ref }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          ACTION: ${{ github.event.action }}
+          LABEL_NAME: ${{ github.event.label.name }}
+          PR_LABELS: ${{ toJson(github.event.pull_request.labels.*.name) }}
         run: |
           if [ "${EVENT_NAME}" = "pull_request" ]; then
             REF="${PR_HEAD_SHA}"
             BRANCH="${PR_HEAD_REF}"
+
+            # Derive variant from labels
+            VARIANT="gpu"
+            if [ "${ACTION}" = "labeled" ]; then
+              [ "${LABEL_NAME}" = "preview-cpu" ] && VARIANT="cpu"
+            else
+              # synchronize — check existing labels on the PR
+              echo "${PR_LABELS}" | grep -q '"preview-cpu"' && VARIANT="cpu"
+            fi
           else
             REF="${GITHUB_SHA}"
             BRANCH="${GITHUB_REF_NAME}"
+            PR_NUMBER=""
+            VARIANT=""
           fi
           payload="$(jq -nc \
             --arg ref "${REF}" \
             --arg branch "${BRANCH}" \
-            '{ref: $ref, branch: $branch}')"
+            --arg pr_number "${PR_NUMBER}" \
+            --arg variant "${VARIANT}" \
+            '{ref: $ref, branch: $branch, pr_number: $pr_number, variant: $variant}')"
           echo "json=${payload}" >> "${GITHUB_OUTPUT}"
 
       - name: Dispatch to cloud repo
diff --git a/.github/workflows/cloud-dispatch-cleanup.yaml b/.github/workflows/cloud-dispatch-cleanup.yaml
new file mode 100644
index 0000000000..764abffbd6
--- /dev/null
+++ b/.github/workflows/cloud-dispatch-cleanup.yaml
@@ -0,0 +1,39 @@
+---
+# Dispatches a frontend-preview-cleanup event to the cloud repo when a
+# frontend PR with a preview label is closed or has its preview label
+# removed. The cloud repo handles the actual environment teardown.
+#
+# This is fire-and-forget — it does NOT wait for the cloud workflow to
+# complete. Status is visible in the cloud repo's Actions tab.
+
+name: Cloud Frontend Preview Cleanup Dispatch
+
+on:
+  pull_request:
+    types: [closed, unlabeled]
+
+permissions: {}
+
+jobs:
+  dispatch:
+    # Only dispatch when:
+    # - PR closed AND had a preview label
+    # - Preview label specifically removed
+    if: >
+      github.repository == 'Comfy-Org/ComfyUI_frontend' &&
+      ((github.event.action == 'closed' &&
+        (contains(github.event.pull_request.labels.*.name, 'preview') ||
+         contains(github.event.pull_request.labels.*.name, 'preview-cpu') ||
+         contains(github.event.pull_request.labels.*.name, 'preview-gpu'))) ||
+       (github.event.action == 'unlabeled' &&
+        contains(fromJSON('["preview","preview-cpu","preview-gpu"]'), github.event.label.name)))
+    runs-on: ubuntu-latest
+    steps:
+      - name: Dispatch to cloud repo
+        uses: peter-evans/repository-dispatch@28959ce8df70de7be546dd1250a005dd32156697 # v4.0.1
+        with:
+          token: ${{ secrets.CLOUD_DISPATCH_TOKEN }}
+          repository: Comfy-Org/cloud
+          event-type: frontend-preview-cleanup
+          client-payload: >-
+            {"pr_number": "${{ github.event.pull_request.number }}"}