diff --git a/ndsl/initialization/allocator.py b/ndsl/initialization/allocator.py
index f421c712..66332ec8 100644
--- a/ndsl/initialization/allocator.py
+++ b/ndsl/initialization/allocator.py
@@ -47,18 +47,6 @@ def __init__(self, sizer: GridSizer, *, backend: str) -> None:
 
         self._allocator = _Allocator(self.backend)
 
-    def set_extra_dim_lengths(self, **kwargs: Any) -> None:
-        """
-        Set the length of extra (non-x/y/z) dimensions.
-        """
-        warnings.warn(
-            "`QuantityFactory.set_extra_dim_lengths` is deprecated. "
-            "Use `add_data_dimensions` or `update_data_dimensions`.",
-            DeprecationWarning,
-            2,
-        )
-        self.sizer.data_dimensions.update(kwargs)
-
     def update_data_dimensions(
         self,
         data_dimension_descriptions: dict[str, int],
diff --git a/ndsl/initialization/grid_sizer.py b/ndsl/initialization/grid_sizer.py
index 961ab793..f3347e27 100644
--- a/ndsl/initialization/grid_sizer.py
+++ b/ndsl/initialization/grid_sizer.py
@@ -1,4 +1,3 @@
-import warnings
 from collections.abc import Sequence
 from dataclasses import dataclass
 
@@ -16,15 +15,6 @@ class GridSizer:
     data_dimensions: dict[str, int]
     """Name/Lengths pair of any non-x/y/z dimensions, such as land or radiation dimensions."""
 
-    @property
-    def extra_dim_lengths(self) -> dict[str, int]:
-        warnings.warn(
-            "`GridSizer.extra_dim_lengths` is a deprecated API, use `GridSizer.data_dimensions`.",
-            DeprecationWarning,
-            2,
-        )
-        return self.data_dimensions
-
     def get_origin(self, dims: Sequence[str]) -> tuple[int, ...]:
         raise NotImplementedError()