diff --git a/homeassistant/components/google_assistant/trait.py b/homeassistant/components/google_assistant/trait.py
index 8790c3c7402..b5dc2afd3e2 100644
--- a/homeassistant/components/google_assistant/trait.py
+++ b/homeassistant/components/google_assistant/trait.py
@@ -648,7 +648,14 @@ class StartStopTrait(_Trait):
         """Execute a StartStop command."""
         if command == COMMAND_STARTSTOP:
             if params["start"] is False:
-                if self.state.state in (cover.STATE_CLOSING, cover.STATE_OPENING):
+                if (
+                    self.state.state
+                    in (
+                        cover.STATE_CLOSING,
+                        cover.STATE_OPENING,
+                    )
+                    or self.state.attributes.get(ATTR_ASSUMED_STATE)
+                ):
                     await self.hass.services.async_call(
                         self.state.domain,
                         cover.SERVICE_STOP_COVER,
diff --git a/tests/components/google_assistant/test_trait.py b/tests/components/google_assistant/test_trait.py
index b7034f927b4..9b573f1cf71 100644
--- a/tests/components/google_assistant/test_trait.py
+++ b/tests/components/google_assistant/test_trait.py
@@ -384,8 +384,8 @@ async def test_startstop_vacuum(hass):
     assert unpause_calls[0].data == {ATTR_ENTITY_ID: "vacuum.bla"}
 
 
-async def test_startstop_covert(hass):
-    """Test startStop trait support for vacuum domain."""
+async def test_startstop_cover(hass):
+    """Test startStop trait support for cover domain."""
     assert helpers.get_google_type(cover.DOMAIN, None) is not None
     assert trait.StartStopTrait.supported(cover.DOMAIN, cover.SUPPORT_STOP, None)
 
@@ -429,6 +429,24 @@ async def test_startstop_covert(hass):
         await trt.execute(trait.COMMAND_PAUSEUNPAUSE, BASIC_DATA, {"start": True}, {})
 
 
+async def test_startstop_cover_assumed(hass):
+    """Test startStop trait support for cover domain of assumed state."""
+    trt = trait.StartStopTrait(
+        hass,
+        State(
+            "cover.bla",
+            cover.STATE_CLOSED,
+            {ATTR_SUPPORTED_FEATURES: cover.SUPPORT_STOP, ATTR_ASSUMED_STATE: True},
+        ),
+        BASIC_CONFIG,
+    )
+
+    stop_calls = async_mock_service(hass, cover.DOMAIN, cover.SERVICE_STOP_COVER)
+    await trt.execute(trait.COMMAND_STARTSTOP, BASIC_DATA, {"start": False}, {})
+    assert len(stop_calls) == 1
+    assert stop_calls[0].data == {ATTR_ENTITY_ID: "cover.bla"}
+
+
 async def test_color_setting_color_light(hass):
     """Test ColorSpectrum trait support for light domain."""
     assert helpers.get_google_type(light.DOMAIN, None) is not None