diff --git a/packages/runtime/src/runClientApp.tsx b/packages/runtime/src/runClientApp.tsx
index d354be4210..f268cb0d2e 100644
--- a/packages/runtime/src/runClientApp.tsx
+++ b/packages/runtime/src/runClientApp.tsx
@@ -120,6 +120,9 @@ export default async function runClientApp(options: RunClientAppOptions) {
           reportRecoverableError(error, errorInfo, { ignoreRuntimeWarning: revalidate });
         }),
       };
+      if (appConfig?.app?.onBeforeHydrate) {
+        appConfig?.app?.onBeforeHydrate();
+      }
       return ReactDOM.hydrateRoot(container, element, hydrateOptions);
     });
   }
diff --git a/packages/runtime/src/types.ts b/packages/runtime/src/types.ts
index 08e659e063..80f2adeeee 100644
--- a/packages/runtime/src/types.ts
+++ b/packages/runtime/src/types.ts
@@ -17,6 +17,7 @@ type App = Partial<{
   strict: boolean;
   errorBoundary: boolean;
   onRecoverableError: (error: unknown, errorInfo: ErrorStack) => void;
+  onBeforeHydrate: () => void;
 } & Record<AppLifecycle, VoidFunction>>;
 
 export interface ErrorStack {