diff --git a/homeassistant/components/remote_calendar/calendar.py b/homeassistant/components/remote_calendar/calendar.py
index 10e1bb44295b9..94928bbdde038 100644
--- a/homeassistant/components/remote_calendar/calendar.py
+++ b/homeassistant/components/remote_calendar/calendar.py
@@ -7,7 +7,7 @@
 from ical.timeline import Timeline, materialize_timeline
 
 from homeassistant.components.calendar import CalendarEntity, CalendarEvent
-from homeassistant.core import HomeAssistant
+from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
 from homeassistant.util import dt as dt_util
@@ -58,6 +58,7 @@ def __init__(
         self._attr_name = entry.data[CONF_CALENDAR_NAME]
         self._attr_unique_id = entry.entry_id
         self._timeline: Timeline | None = None
+        self._manual_update_in_progress = False
 
     @property
     def event(self) -> CalendarEvent | None:
@@ -85,14 +86,8 @@ def events_in_range() -> list[CalendarEvent]:
 
         return await self.hass.async_add_executor_job(events_in_range)
 
-    async def async_update(self) -> None:
-        """Refresh the timeline.
-
-        This is called when the coordinator updates. Creating the timeline may
-        require walking through the entire calendar and handling recurring
-        events, so it is done as a separate task without blocking the event loop.
-        """
-        await super().async_update()
+    async def _async_update_timeline(self) -> None:
+        """Refresh the materialized timeline."""
 
         def _get_timeline() -> Timeline | None:
             """Return a materialized timeline with upcoming events."""
@@ -107,6 +102,39 @@ def _get_timeline() -> Timeline | None:
 
         self._timeline = await self.hass.async_add_executor_job(_get_timeline)
 
+    @callback
+    def _handle_coordinator_update(self) -> None:
+        """Handle updated data from the coordinator."""
+        if not self.coordinator.last_update_success:
+            self.async_write_ha_state()
+            return
+
+        if self._manual_update_in_progress:
+            return
+
+        self.coordinator.config_entry.async_create_task(
+            self.hass,
+            self._async_handle_coordinator_update(),
+            name="remote calendar timeline update",
+        )
+
+    async def _async_handle_coordinator_update(self) -> None:
+        """Refresh the timeline and write state."""
+        await self._async_update_timeline()
+        self.async_write_ha_state()
+
+    async def async_update(self) -> None:
+        """Refresh the coordinator and materialized timeline."""
+        self._manual_update_in_progress = True
+        try:
+            await super().async_update()
+        finally:
+            self._manual_update_in_progress = False
+        if self.coordinator.last_update_success:
+            await self._async_update_timeline()
+            if self.entity_id is not None:
+                self.async_write_ha_state()
+
 
 def _get_calendar_event(event: Event) -> CalendarEvent:
     """Return a CalendarEvent from an API event."""
diff --git a/tests/components/remote_calendar/test_calendar.py b/tests/components/remote_calendar/test_calendar.py
index ea52d961414ba..20d6595d4ef5e 100644
--- a/tests/components/remote_calendar/test_calendar.py
+++ b/tests/components/remote_calendar/test_calendar.py
@@ -296,6 +296,58 @@ async def test_upcoming_event(
     }
 
 
+@pytest.mark.freeze_time("2026-05-18 06:00:00+00:00")
+@respx.mock
+async def test_coordinator_refresh_updates_upcoming_event_state(
+    hass: HomeAssistant,
+    config_entry: MockConfigEntry,
+) -> None:
+    """Test a coordinator refresh updates the materialized upcoming event."""
+    original_calendar = textwrap.dedent(
+        """\
+        BEGIN:VCALENDAR
+        VERSION:2.0
+        BEGIN:VEVENT
+        SUMMARY:Wake up
+        DTSTART:20260518T064000
+        DTEND:20260518T065500
+        END:VEVENT
+        END:VCALENDAR
+        """
+    )
+    updated_calendar = textwrap.dedent(
+        """\
+        BEGIN:VCALENDAR
+        VERSION:2.0
+        BEGIN:VEVENT
+        SUMMARY:Wake up
+        DTSTART:20260518T080000
+        DTEND:20260518T081500
+        END:VEVENT
+        END:VCALENDAR
+        """
+    )
+    respx.get(CALENDER_URL).mock(
+        side_effect=[
+            Response(status_code=200, text=original_calendar),
+            Response(status_code=200, text=original_calendar),
+            Response(status_code=200, text=updated_calendar),
+        ]
+    )
+    await setup_integration(hass, config_entry)
+
+    state = hass.states.get(TEST_ENTITY)
+    assert state
+    assert state.attributes["start_time"] == "2026-05-18 06:40:00"
+
+    await config_entry.runtime_data.async_refresh()
+    await hass.async_block_till_done()
+
+    state = hass.states.get(TEST_ENTITY)
+    assert state
+    assert state.attributes["start_time"] == "2026-05-18 08:00:00"
+
+
 @respx.mock
 async def test_recurring_event(
     get_events: GetEventsFn,