diff --git a/homeassistant/components/husqvarna_automower/calendar.py b/homeassistant/components/husqvarna_automower/calendar.py
index b4d3d2176af..ac7447bc3c0 100644
--- a/homeassistant/components/husqvarna_automower/calendar.py
+++ b/homeassistant/components/husqvarna_automower/calendar.py
@@ -70,6 +70,8 @@ class AutomowerCalendarEntity(AutomowerBaseEntity, CalendarEntity):
     @property
     def event(self) -> CalendarEvent | None:
         """Return the current or next upcoming event."""
+        if not self.available:
+            return None
         schedule = self.mower_attributes.calendar
         cursor = schedule.timeline.active_after(dt_util.now())
         program_event = next(cursor, None)
@@ -94,6 +96,8 @@ class AutomowerCalendarEntity(AutomowerBaseEntity, CalendarEntity):
 
         This is only called when opening the calendar in the UI.
         """
+        if not self.available:
+            return []
         schedule = self.mower_attributes.calendar
         cursor = schedule.timeline.overlapping(
             start_date,
diff --git a/homeassistant/components/husqvarna_automower/entity.py b/homeassistant/components/husqvarna_automower/entity.py
index 150a3d18d87..3ccb098262f 100644
--- a/homeassistant/components/husqvarna_automower/entity.py
+++ b/homeassistant/components/husqvarna_automower/entity.py
@@ -114,6 +114,11 @@ class AutomowerBaseEntity(CoordinatorEntity[AutomowerDataUpdateCoordinator]):
         """Get the mower attributes of the current mower."""
         return self.coordinator.data[self.mower_id]
 
+    @property
+    def available(self) -> bool:
+        """Return True if the device is available."""
+        return super().available and self.mower_id in self.coordinator.data
+
 
 class AutomowerAvailableEntity(AutomowerBaseEntity):
     """Replies available when the mower is connected."""
diff --git a/tests/components/husqvarna_automower/test_init.py b/tests/components/husqvarna_automower/test_init.py
index f54250a3336..d4921bf661d 100644
--- a/tests/components/husqvarna_automower/test_init.py
+++ b/tests/components/husqvarna_automower/test_init.py
@@ -312,8 +312,9 @@ async def test_coordinator_automatic_registry_cleanup(
         dr.async_entries_for_config_entry(device_registry, entry.entry_id)
     )
     # Remove mower 2 and check if it worked
-    mower2 = values.pop("1234")
-    mock_automower_client.get_status.return_value = values
+    values_copy = deepcopy(values)
+    mower2 = values_copy.pop("1234")
+    mock_automower_client.get_status.return_value = values_copy
     freezer.tick(SCAN_INTERVAL)
     async_fire_time_changed(hass)
     await hass.async_block_till_done()
@@ -327,8 +328,9 @@ async def test_coordinator_automatic_registry_cleanup(
         == current_devices - 1
     )
     # Add mower 2 and check if it worked
-    values["1234"] = mower2
-    mock_automower_client.get_status.return_value = values
+    values_copy = deepcopy(values)
+    values_copy["1234"] = mower2
+    mock_automower_client.get_status.return_value = values_copy
     freezer.tick(SCAN_INTERVAL)
     async_fire_time_changed(hass)
     await hass.async_block_till_done()
@@ -342,8 +344,9 @@ async def test_coordinator_automatic_registry_cleanup(
     )
 
     # Remove mower 1 and check if it worked
-    mower1 = values.pop(TEST_MOWER_ID)
-    mock_automower_client.get_status.return_value = values
+    values_copy = deepcopy(values)
+    mower1 = values_copy.pop(TEST_MOWER_ID)
+    mock_automower_client.get_status.return_value = values_copy
     freezer.tick(SCAN_INTERVAL)
     async_fire_time_changed(hass)
     await hass.async_block_till_done()
@@ -357,11 +360,9 @@ async def test_coordinator_automatic_registry_cleanup(
         == current_devices - 1
     )
     # Add mower 1 and check if it worked
-    values[TEST_MOWER_ID] = mower1
-    mock_automower_client.get_status.return_value = values
-    freezer.tick(SCAN_INTERVAL)
-    async_fire_time_changed(hass)
-    await hass.async_block_till_done()
+    values_copy = deepcopy(values)
+    values_copy[TEST_MOWER_ID] = mower1
+    mock_automower_client.get_status.return_value = values_copy
     freezer.tick(SCAN_INTERVAL)
     async_fire_time_changed(hass)
     await hass.async_block_till_done()