diff --git a/homeassistant/components/shelly/cover.py b/homeassistant/components/shelly/cover.py
index d7dafca90e68..a02045333502 100644
--- a/homeassistant/components/shelly/cover.py
+++ b/homeassistant/components/shelly/cover.py
@@ -120,13 +120,33 @@ class BlockShellyCover(ShellyBlockAttributeEntity, CoverEntity):
         self.control_result: dict[str, Any] | None = None
         self._attr_name = None  # Main device entity
         self._attr_unique_id: str = f"{coordinator.mac}-{block.description}"
-        if self.coordinator.device.settings["rollers"][0]["positioning"]:
+        self._positioning: bool = self.coordinator.device.settings["rollers"][0][
+            "positioning"
+        ]
+        # Without positioning the direction it last travelled in is all there is,
+        # and that says nothing about where it stopped
+        self._attr_assumed_state = not self._positioning
+        if self._positioning:
             self._attr_supported_features |= CoverEntityFeature.SET_POSITION
 
     @property
     @override
-    def is_closed(self) -> bool:
+    def is_closed(self) -> bool | None:
         """If cover is closed."""
+        if not self._positioning:
+            # An uncalibrated roller parks its position on 101, so the direction
+            # it last travelled in is all there is to go on
+            last_direction = self.coordinator.device.status["rollers"][0].get(
+                "last_direction"
+            )
+            if self.control_result:
+                last_direction = self.control_result.get(
+                    "last_direction", last_direction
+                )
+            if not last_direction:
+                return None
+            return cast(str, last_direction) == "close"
+
         if self.control_result:
             return cast(bool, self.control_result["current_pos"] == 0)
 
@@ -134,8 +154,11 @@ class BlockShellyCover(ShellyBlockAttributeEntity, CoverEntity):
 
     @property
     @override
-    def current_cover_position(self) -> int:
+    def current_cover_position(self) -> int | None:
         """Position of the cover."""
+        if not self._positioning:
+            return None
+
         if self.control_result:
             return cast(int, self.control_result["current_pos"])
 
diff --git a/tests/components/shelly/test_cover.py b/tests/components/shelly/test_cover.py
index d028bb04dd92..100a49506aab 100644
--- a/tests/components/shelly/test_cover.py
+++ b/tests/components/shelly/test_cover.py
@@ -1,7 +1,7 @@
 """Tests for Shelly cover platform."""
 
 from copy import deepcopy
-from unittest.mock import Mock
+from unittest.mock import AsyncMock, Mock
 
 from freezegun.api import FrozenDateTimeFactory
 import pytest
@@ -23,7 +23,13 @@ from homeassistant.components.cover import (
     CoverState,
 )
 from homeassistant.components.shelly.const import RPC_COVER_UPDATE_TIME_SEC
-from homeassistant.const import ATTR_ENTITY_ID, STATE_UNAVAILABLE, Platform
+from homeassistant.const import (
+    ATTR_ASSUMED_STATE,
+    ATTR_ENTITY_ID,
+    STATE_UNAVAILABLE,
+    STATE_UNKNOWN,
+    Platform,
+)
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_registry import EntityRegistry
 
@@ -111,6 +117,83 @@ async def test_block_device_update(
     state = hass.states.get("cover.test_name")
     assert state
     assert state.state == CoverState.OPEN
+    assert ATTR_ASSUMED_STATE not in state.attributes
+
+
+@pytest.mark.parametrize(
+    ("last_direction", "expected_state"),
+    [
+        ("close", CoverState.CLOSED),
+        ("open", CoverState.OPEN),
+        # Nothing has moved since the device booted
+        (None, STATE_UNKNOWN),
+    ],
+)
+async def test_block_device_roller_without_positioning(
+    hass: HomeAssistant,
+    mock_block_device: Mock,
+    monkeypatch: pytest.MonkeyPatch,
+    last_direction: str | None,
+    expected_state: str,
+) -> None:
+    """Test an uncalibrated roller reports the direction it last travelled in."""
+    settings = deepcopy(mock_block_device.settings)
+    settings["rollers"][0]["positioning"] = False
+    monkeypatch.setattr(mock_block_device, "settings", settings)
+
+    status = deepcopy(mock_block_device.status)
+    # An uncalibrated roller parks its position on 101
+    status["rollers"] = [{"current_pos": 101, "last_direction": last_direction}]
+    monkeypatch.setattr(mock_block_device, "status", status)
+
+    await init_integration(hass, 1)
+
+    assert (state := hass.states.get("cover.test_name"))
+    assert state.state == expected_state
+    assert state.attributes.get(ATTR_CURRENT_POSITION) is None
+    # Stopping mid travel leaves the direction saying more than it knows, so
+    # both buttons stay available
+    assert state.attributes[ATTR_ASSUMED_STATE] is True
+
+
+async def test_block_device_roller_without_positioning_stopped(
+    hass: HomeAssistant,
+    mock_block_device: Mock,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """Test stopping an uncalibrated roller keeps it on its last direction."""
+    settings = deepcopy(mock_block_device.settings)
+    settings["rollers"][0]["positioning"] = False
+    monkeypatch.setattr(mock_block_device, "settings", settings)
+
+    status = deepcopy(mock_block_device.status)
+    status["rollers"] = [{"current_pos": 101, "last_direction": "close"}]
+    monkeypatch.setattr(mock_block_device, "status", status)
+
+    # An uncalibrated roller answers a command with position 101 as well
+    monkeypatch.setattr(
+        mock_block_device.blocks[ROLLER_BLOCK_ID],
+        "set_state",
+        AsyncMock(
+            side_effect=lambda go, roller_pos=0: {"current_pos": 101, "state": go}
+        ),
+    )
+
+    await init_integration(hass, 1)
+
+    entity_id = "cover.test_name"
+    assert (state := hass.states.get(entity_id))
+    assert state.state == CoverState.CLOSED
+
+    await hass.services.async_call(
+        COVER_DOMAIN,
+        SERVICE_STOP_COVER,
+        {ATTR_ENTITY_ID: entity_id},
+        blocking=True,
+    )
+
+    assert (state := hass.states.get(entity_id))
+    assert state.state == CoverState.CLOSED
 
 
 async def test_block_device_no_roller_blocks(