diff --git a/client/src/components/Layout/NativeWidgetsSync.tsx b/client/src/components/Layout/NativeWidgetsSync.tsx
index 0252a2800..a1b6a6aba 100644
--- a/client/src/components/Layout/NativeWidgetsSync.tsx
+++ b/client/src/components/Layout/NativeWidgetsSync.tsx
@@ -20,6 +20,7 @@ import { widgetCover, widgetWeather } from '../../native/widgetMedia';
 import { atlasSummary, collabSummary, packingDetail, type WidgetAtlas } from '../../native/widgetOnline';
 import {
   buildSnapshot,
+  liveDayDue,
   pickTrip,
   publishWidgets,
   todayOf,
@@ -207,9 +208,10 @@ export default function NativeWidgetsSync(): null {
         });
       }
       if (cancelled) return;
-      const live = main.day
-        ? tripDayState(main.day, now.getHours() * 60 + now.getMinutes(), t('native.widget.dayDone'))
-        : null;
+      // The Live Activity from three hours before the day's first timed stop, not all day long.
+      const minutes = now.getHours() * 60 + now.getMinutes();
+      const live =
+        main.day && liveDayDue(main.day, minutes) ? tripDayState(main.day, minutes, t('native.widget.dayDone')) : null;
       await publishWidgets(main.snapshot, live, choices);
       await publishToWatch(hero, main, today);
     };
diff --git a/client/src/native/widgets.test.ts b/client/src/native/widgets.test.ts
index 18be985eb..f220ae68a 100644
--- a/client/src/native/widgets.test.ts
+++ b/client/src/native/widgets.test.ts
@@ -15,6 +15,7 @@ vi.mock('./trekShell', () => ({
 import { TrekShell } from './trekShell';
 import {
   buildSnapshot,
+  liveDayDue,
   pickTrip,
   publishWidgets,
   todayOf,
@@ -151,6 +152,40 @@ describe('todayOf and tripDayState', () => {
   });
 });
 
+describe('liveDayDue', () => {
+  const evening = {
+    tripTitle: 'T',
+    path: '/trips/1',
+    dayLabel: 'D',
+    stops: [
+      { name: 'Walk', time: null, minutes: null },
+      { name: 'Uber to the airport', time: '18:00', minutes: 18 * 60 },
+      { name: 'Flight', time: '21:00', minutes: 21 * 60 },
+    ],
+  };
+
+  it('keeps the lock screen free until three hours before the first timed stop', () => {
+    expect(liveDayDue(evening, 6 * 60 + 32)).toBe(false);
+    expect(liveDayDue(evening, 14 * 60 + 59)).toBe(false);
+    expect(liveDayDue(evening, 15 * 60)).toBe(true);
+  });
+
+  it('stays on through the day once it has started, until the day is done', () => {
+    expect(liveDayDue(evening, 19 * 60)).toBe(true);
+    expect(liveDayDue(evening, 23 * 60 + 30)).toBe(true);
+  });
+
+  it('starts from the earliest timed stop, wherever it stands in the list', () => {
+    const early = { ...evening, stops: [...evening.stops, { name: 'Breakfast', time: '08:00', minutes: 8 * 60 }] };
+    expect(liveDayDue(early, 5 * 60)).toBe(true);
+    expect(liveDayDue(early, 4 * 60 + 59)).toBe(false);
+  });
+
+  it('has nothing to show on a day without times', () => {
+    expect(liveDayDue({ ...evening, stops: [{ name: 'Walk', time: null, minutes: null }] }, 12 * 60)).toBe(false);
+  });
+});
+
 describe('publishWidgets', () => {
   it('writes the snapshot without the internal minutes and ends the activity on a day without times', async () => {
     const snapshot = buildSnapshot(
diff --git a/client/src/native/widgets.ts b/client/src/native/widgets.ts
index aebe46c82..4b4019eda 100644
--- a/client/src/native/widgets.ts
+++ b/client/src/native/widgets.ts
@@ -357,6 +357,23 @@ export function tripDayState(day: TripDay, nowMinutes: number, allDone: string):
   };
 }
 
+/** How long before the day's first timed stop its Live Activity appears. */
+export const LIVE_LEAD_MINUTES = 3 * 60;
+
+/**
+ * Whether the travel day's Live Activity belongs on the lock screen now: from
+ * three hours before the first stop with a time, then until the day is done. A
+ * day whose first stop is an evening flight does not hold the lock screen from
+ * the morning on.
+ */
+export function liveDayDue(day: TripDay, nowMinutes: number): boolean {
+  const first = day.stops.reduce<number | null>(
+    (min, s) => (s.minutes != null && (min === null || s.minutes < min) ? s.minutes : min),
+    null
+  );
+  return first !== null && nowMinutes >= first - LIVE_LEAD_MINUTES;
+}
+
 /** A trip a widget can be set to in Edit Widget, and its snapshot. */
 export interface TripWidgetSnapshot {
   id: number;