diff --git a/yt/frontends/boxlib/data_structures.py b/yt/frontends/boxlib/data_structures.py
index d7c8e087a71..2725275896f 100644
--- a/yt/frontends/boxlib/data_structures.py
+++ b/yt/frontends/boxlib/data_structures.py
@@ -739,6 +739,9 @@ def _parse_cparams(self):
                 param, vals = (s.strip() for s in line.split("="))
             except ValueError:
                 continue
+            # Castro and Maestro mark overridden defaults with a "[*]" before
+            # the parameter name
+            param = param.removeprefix("[*]").strip()
             if param == "amr.ref_ratio":
                 vals = self.refine_by = int(vals[0])
             elif param == "Prob.lo_bc":
@@ -1128,16 +1131,6 @@ def _parse_parameter_file(self):
                     self.parameters[fields[0]] = fields[1].strip()
                 line = next(f)
 
-            # runtime parameters that we overrode follow "Inputs File
-            # Parameters"
-            # skip the "====..." line
-            line = next(f)
-            for line in f:
-                if line.strip() == "" or "fortin parameters" in line:
-                    continue
-                p, v = line.strip().split("=")
-                self.parameters[p] = v.strip()
-
         # hydro method is set by the base class -- override it here
         self.parameters["HydroMethod"] = "Castro"
 
@@ -1199,21 +1192,8 @@ def _parse_parameter_file(self):
                     fields = line.split(":")
                     self.parameters[fields[0]] = fields[1].strip()
 
-        with open(jobinfo_filename) as f:
-            # get the runtime parameters
-            for line in f:
-                try:
-                    p, v = (_.strip() for _ in line[4:].split("=", 1))
-                    if len(v) == 0:
-                        self.parameters[p] = ""
-                    else:
-                        self.parameters[p] = _guess_pcast(v)
-                except ValueError:
-                    # not a parameter line
-                    pass
-
-            # hydro method is set by the base class -- override it here
-            self.parameters["HydroMethod"] = "Maestro"
+        # hydro method is set by the base class -- override it here
+        self.parameters["HydroMethod"] = "Maestro"
 
         # set the periodicity based on the integer BC runtime parameters
         periodicity = [False, False, False]
diff --git a/yt/frontends/boxlib/tests/test_outputs.py b/yt/frontends/boxlib/tests/test_outputs.py
index d3e9e5d91e5..f0d3bb2647d 100644
--- a/yt/frontends/boxlib/tests/test_outputs.py
+++ b/yt/frontends/boxlib/tests/test_outputs.py
@@ -443,3 +443,28 @@ def test_maestro_parameters():
     # Check an int parameter
     assert ds.parameters["s0_interp_type"] == 3
     assert type(ds.parameters["s0_interp_type"]) is int  # noqa: E721
+
+
+castro_1d_cyl = "castro_sedov_1d_cyl_plt00150"
+
+
+@requires_file(castro_1d_cyl)
+def test_castro_parameters():
+    ds = data_dir_load(castro_1d_cyl)
+    assert isinstance(ds, CastroDataset)
+
+    # Modified from default (leading [*])
+    assert ds.parameters["castro.do_hydro"] == 1
+    assert ds.parameters["castro.cfl"] == 0.5
+    assert ds.parameters["problem.p_ambient"] == float("1e-06")
+    # Leading [*] should be removed from the parameter name
+    assert "[*] castro.do_hydro" not in ds.parameters
+
+    # Not modified from default
+    assert ds.parameters["castro.pslope_cutoff_density"] == float("-1e+20")
+    assert ds.parameters["castro.do_sponge"] == 0
+    assert ds.parameters["problem.dens_ambient"] == 1
+    assert ds.parameters["eos.eos_assume_neutral"] == 1
+
+    # Empty string value
+    assert ds.parameters["castro.stopping_criterion_field"] is None