diff --git a/flopy/utils/rasters.py b/flopy/utils/rasters.py
index 1c8989d89..c2c72a596 100644
--- a/flopy/utils/rasters.py
+++ b/flopy/utils/rasters.py
@@ -996,6 +996,11 @@ def plot(self, ax=None, contour=False, **kwargs):
         import_optional_dependency("rasterio")
         from rasterio.plot import show
 
+        # rasterio >= 1.5 defaults to adjusting data to [0, 1], which
+        # can clash with user-supplied vmin/vmax. don't adjust unless
+        # the caller explicitly asks for it
+        kwargs.setdefault("adjust", False)
+
         if self._dataset is not None:
             ax = show(self._dataset, ax=ax, contour=contour, **kwargs)