diff --git a/stac_geoparquet/stac_geoparquet.py b/stac_geoparquet/stac_geoparquet.py
index 0974547..2efc299 100644
--- a/stac_geoparquet/stac_geoparquet.py
+++ b/stac_geoparquet/stac_geoparquet.py
@@ -38,6 +38,7 @@ def to_geodataframe(
     items: Sequence[dict[str, Any]],
     add_self_link: bool = False,
     dtype_backend: DTYPE_BACKEND | None = None,
+    datetime_precision: str = "us",
 ) -> geopandas.GeoDataFrame:
     """
     Convert a sequence of STAC items to a :class:`geopandas.GeoDataFrame`.
@@ -86,6 +87,10 @@ def to_geodataframe(
         with fields ``{"href": "a.tif", "title", None}``. pyarrow will
         infer that the struct field ``asset.title`` is nullable.
 
+    datetime_precision: str, default "us"
+        The precision to use for the datetime columns. For example,
+        "us" is microsecond and "ns" is nanosecond.
+
     Returns
     -------
     The converted GeoDataFrame.
@@ -150,9 +155,8 @@ def to_geodataframe(
     if dtype_backend == "pyarrow":
         for k, v in items2.items():
             if k in DATETIME_COLUMNS:
-                items2[k] = pd.arrays.ArrowExtensionArray(
-                    pa.array(pd.to_datetime(v, format="ISO8601"))
-                )
+                dt = pd.to_datetime(v, format="ISO8601").as_unit(datetime_precision)
+                items2[k] = pd.arrays.ArrowExtensionArray(pa.array(dt))
 
             elif k != "geometry":
                 items2[k] = pd.arrays.ArrowExtensionArray(pa.array(v))
@@ -160,7 +164,9 @@ def to_geodataframe(
     elif dtype_backend == "numpy_nullable":
         for k, v in items2.items():
             if k in DATETIME_COLUMNS:
-                items2[k] = pd.to_datetime(v, format="ISO8601")
+                items2[k] = pd.to_datetime(v, format="ISO8601").as_unit(
+                    datetime_precision
+                )
 
             if k in {"type", "stac_version", "id", "collection", SELF_LINK_COLUMN}:
                 items2[k] = pd.array(v, dtype="string")
diff --git a/tests/test_stac_geoparquet.py b/tests/test_stac_geoparquet.py
index 3ddca61..b9e18b7 100644
--- a/tests/test_stac_geoparquet.py
+++ b/tests/test_stac_geoparquet.py
@@ -227,7 +227,7 @@ def test_assert_equal():
         ],
         "collection": ["naip"],
         "gsd": [0.6],
-        "datetime": pd.to_datetime(["2019-08-28 00:00:00+0000"]),
+        "datetime": pd.to_datetime(["2019-08-28 00:00:00+0000"]).as_unit("us"),
         "naip:year": ["2019"],
         "proj:bbox": [[592596.0, 4663966.8, 598495.8, 4671633.0]],
         "proj:epsg": [26915],