diff --git a/client/src/store/authStore.ts b/client/src/store/authStore.ts
index 4a3f8a84..74fe01e1 100644
--- a/client/src/store/authStore.ts
+++ b/client/src/store/authStore.ts
@@ -151,6 +151,7 @@ export const useAuthStore = create<AuthState>()(
 
   logout: () => {
     disconnect()
+    useSystemNoticeStore.getState().reset()
     // Tell server to clear the httpOnly cookie
     fetch('/api/auth/logout', { method: 'POST', credentials: 'include' }).catch(() => {})
     // Clear service worker caches containing sensitive data
diff --git a/client/src/store/systemNoticeStore.ts b/client/src/store/systemNoticeStore.ts
index 249b0b6b..e3a979ef 100644
--- a/client/src/store/systemNoticeStore.ts
+++ b/client/src/store/systemNoticeStore.ts
@@ -31,6 +31,7 @@ interface SystemNoticeState {
   fetching: boolean;
   fetch: () => Promise<void>;
   dismiss: (id: string) => void;
+  reset: () => void;
 }
 
 export const useSystemNoticeStore = create<SystemNoticeState>()((set, get) => ({
@@ -51,6 +52,10 @@ export const useSystemNoticeStore = create<SystemNoticeState>()((set, get) => ({
     }
   },
 
+  reset() {
+    set({ notices: [], loaded: false, fetching: false });
+  },
+
   dismiss(id: string) {
     // Optimistic: remove immediately
     const prev = get().notices;