diff --git a/dbt/adapters/duckdb/connections.py b/dbt/adapters/duckdb/connections.py
index cbd68dc9..359e153e 100644
--- a/dbt/adapters/duckdb/connections.py
+++ b/dbt/adapters/duckdb/connections.py
@@ -3,6 +3,7 @@
 from contextlib import contextmanager
 from multiprocessing.context import SpawnContext
 from typing import Optional
+from typing import Set
 from typing import Tuple
 from typing import TYPE_CHECKING
 
@@ -25,6 +26,7 @@ class DuckDBConnectionManager(SQLConnectionManager):
     TYPE = "duckdb"
     _LOCK = threading.RLock()
     _ENV = None
+    _LOGGED_MESSAGES: Set[str] = set()
 
     def __init__(self, config: AdapterRequiredConfig, mp_context: SpawnContext) -> None:
         super().__init__(config, mp_context)
@@ -68,6 +70,15 @@ def close(cls, connection: Connection) -> Connection:
         connection = super(SQLConnectionManager, cls).close(connection)
         return connection
 
+    @classmethod
+    def warn_once(cls, msg: str):
+        """Post a warning message once per dbt execution."""
+        with cls._LOCK:
+            if msg in cls._LOGGED_MESSAGES:
+                return
+            cls._LOGGED_MESSAGES.add(msg)
+            logger.warning(msg)
+
     def cancel(self, connection: Connection):
         if self._ENV is not None:
             logger.debug(
diff --git a/dbt/adapters/duckdb/impl.py b/dbt/adapters/duckdb/impl.py
index 89de7873..b24c01db 100644
--- a/dbt/adapters/duckdb/impl.py
+++ b/dbt/adapters/duckdb/impl.py
@@ -22,6 +22,7 @@
 from dbt.adapters.duckdb.relation import DuckDBRelation
 from dbt.adapters.duckdb.utils import TargetConfig
 from dbt.adapters.duckdb.utils import TargetLocation
+from dbt.adapters.events.logging import AdapterLogger
 from dbt.adapters.sql import SQLAdapter
 
 
@@ -31,6 +32,8 @@
 if TYPE_CHECKING:
     import agate
 
+logger = AdapterLogger("DuckDB")
+
 
 class DuckDBAdapter(SQLAdapter):
     ConnectionManager = DuckDBConnectionManager
@@ -171,6 +174,11 @@ def external_read_location(self, write_location: str, rendered_options: dict) ->
             return ".".join(["/".join(globs), str(rendered_options.get("format", "parquet"))])
         return write_location
 
+    @available
+    def warn_once(self, msg: str):
+        """Post a warning message once per dbt execution."""
+        DuckDBConnectionManager.warn_once(msg)
+
     def valid_incremental_strategies(self) -> Sequence[str]:
         """DuckDB does not currently support MERGE statement."""
         return ["append", "delete+insert"]
@@ -255,7 +263,8 @@ def _clean_up_temp_relation_for_incremental(self, config):
         if self.is_motherduck() and hasattr(config, "model"):
             if "incremental" == config.model.get_materialization():
                 temp_relation = self.Relation(
-                    path=self.get_temp_relation_path(config.model), type=RelationType.Table
+                    path=self.get_temp_relation_path(config.model),
+                    type=RelationType.Table,
                 )
                 self.drop_relation(temp_relation)
 
@@ -278,7 +287,9 @@ def get_temp_relation_path(self, model: Any):
         table that is dropped at the end of the incremental macro or post-model hook.
         """
         return Path(
-            schema=self._temp_schema_name, database=model.database, identifier=model.identifier
+            schema=self._temp_schema_name,
+            database=model.database,
+            identifier=model.identifier,
         )
 
     def post_model_hook(self, config: Any, context: Any) -> None:
diff --git a/dbt/include/duckdb/macros/adapters.sql b/dbt/include/duckdb/macros/adapters.sql
index 84f2ac0b..29d2d570 100644
--- a/dbt/include/duckdb/macros/adapters.sql
+++ b/dbt/include/duckdb/macros/adapters.sql
@@ -237,3 +237,10 @@ def materialize(df, con):
 
   {% do return(options) %}
 {%- endmacro %}
+
+{% macro duckdb__apply_grants(relation, grant_config, should_revoke=True) %}
+    {#-- If grant_config is {} or None, this is a no-op --#}
+    {% if grant_config %}
+      {{ adapter.warn_once('Grants for relations are not supported by DuckDB') }}
+    {% endif %}
+{% endmacro %}