diff --git a/homeassistant/components/matter/lock.py b/homeassistant/components/matter/lock.py
index e5067efd482..f58ded01013 100644
--- a/homeassistant/components/matter/lock.py
+++ b/homeassistant/components/matter/lock.py
@@ -168,6 +168,9 @@ class MatterLock(MatterEntity, LockEntity):
             self._attr_is_jammed = (
                 door_state is clusters.DoorLock.Enums.DoorStateEnum.kDoorJammed
             )
+            self._attr_is_open = (
+                door_state is clusters.DoorLock.Enums.DoorStateEnum.kDoorOpen
+            )
 
 
 DISCOVERY_SCHEMAS = [
diff --git a/tests/components/matter/test_door_lock.py b/tests/components/matter/test_door_lock.py
index 7f6abeff62b..6e0e0846ad5 100644
--- a/tests/components/matter/test_door_lock.py
+++ b/tests/components/matter/test_door_lock.py
@@ -9,6 +9,7 @@ import pytest
 from homeassistant.components.lock import (
     STATE_LOCKED,
     STATE_LOCKING,
+    STATE_OPEN,
     STATE_UNLOCKED,
     STATE_UNLOCKING,
     LockEntityFeature,
@@ -208,3 +209,10 @@ async def test_lock_with_unbolt(
         command=clusters.DoorLock.Commands.UnlockDoor(),
         timed_request_timeout_ms=1000,
     )
+
+    set_node_attribute(door_lock_with_unbolt, 1, 257, 3, 0)
+    await trigger_subscription_callback(hass, matter_client)
+
+    state = hass.states.get("lock.mock_door_lock")
+    assert state
+    assert state.state == STATE_OPEN