diff --git a/openmc/mesh.py b/openmc/mesh.py
index f0c0d7414fe..215c9192336 100644
--- a/openmc/mesh.py
+++ b/openmc/mesh.py
@@ -1388,6 +1388,8 @@ def r_grid(self):
     @r_grid.setter
     def r_grid(self, grid):
         cv.check_type('mesh r_grid', grid, Iterable, Real)
+        cv.check_length('mesh r_grid', grid, 2)
+        cv.check_increasing('mesh r_grid', grid)
         self._r_grid = np.asarray(grid, dtype=float)
 
     @property
@@ -1397,7 +1399,12 @@ def phi_grid(self):
     @phi_grid.setter
     def phi_grid(self, grid):
         cv.check_type('mesh phi_grid', grid, Iterable, Real)
-        self._phi_grid = np.asarray(grid, dtype=float)
+        cv.check_length('mesh phi_grid', grid, 2)
+        cv.check_increasing('mesh phi_grid', grid)
+        grid = np.asarray(grid, dtype=float)
+        if np.any((grid < 0.0) | (grid > 2*pi)):
+            raise ValueError("phi_grid values must be in [0, 2π].")
+        self._phi_grid = grid
 
     @property
     def z_grid(self):
@@ -1406,6 +1413,8 @@ def z_grid(self):
     @z_grid.setter
     def z_grid(self, grid):
         cv.check_type('mesh z_grid', grid, Iterable, Real)
+        cv.check_length('mesh z_grid', grid, 2)
+        cv.check_increasing('mesh z_grid', grid)
         self._z_grid = np.asarray(grid, dtype=float)
 
     @property
@@ -1840,7 +1849,10 @@ def theta_grid(self, grid):
         cv.check_type('mesh theta_grid', grid, Iterable, Real)
         cv.check_length('mesh theta_grid', grid, 2)
         cv.check_increasing('mesh theta_grid', grid)
-        self._theta_grid = np.asarray(grid, dtype=float)
+        grid = np.asarray(grid, dtype=float)
+        if np.any((grid < 0.0) | (grid > pi)):
+            raise ValueError("theta_grid values must be in [0, π].")
+        self._theta_grid = grid
 
     @property
     def phi_grid(self):
@@ -1851,7 +1863,10 @@ def phi_grid(self, grid):
         cv.check_type('mesh phi_grid', grid, Iterable, Real)
         cv.check_length('mesh phi_grid', grid, 2)
         cv.check_increasing('mesh phi_grid', grid)
-        self._phi_grid = np.asarray(grid, dtype=float)
+        grid = np.asarray(grid, dtype=float)
+        if np.any((grid < 0.0) | (grid > 2*pi)):
+            raise ValueError("phi_grid values must be in [0, 2π].")
+        self._phi_grid = grid
 
     @property
     def _grids(self):
diff --git a/tests/unit_tests/mesh_to_vtk/test_vtk_dims.py b/tests/unit_tests/mesh_to_vtk/test_vtk_dims.py
index baa54498438..0b6acf5aabf 100644
--- a/tests/unit_tests/mesh_to_vtk/test_vtk_dims.py
+++ b/tests/unit_tests/mesh_to_vtk/test_vtk_dims.py
@@ -153,7 +153,7 @@ def test_write_data_to_vtk_round_trip(run_in_tmpdir):
 
     smesh = openmc.SphericalMesh(
         r_grid=(0.0, 1.0, 2.0),
-        theta_grid=(0.0, 2.0, 4.0, 5.0),
+        theta_grid=(0.0, 0.5, 1.0, 2.0),
         phi_grid=(0.0, 3.0, 6.0),
     )
     rmesh = openmc.RegularMesh()
diff --git a/tests/unit_tests/test_mesh.py b/tests/unit_tests/test_mesh.py
index 0f7f71ceae1..ed08be816f5 100644
--- a/tests/unit_tests/test_mesh.py
+++ b/tests/unit_tests/test_mesh.py
@@ -189,6 +189,42 @@ def test_CylindricalMesh_initiation():
         openmc.SphericalMesh(('🧇', '🥞'))
 
 
+def test_invalid_cylindrical_mesh_errors():
+    # Test invalid r_grid values
+    with pytest.raises(ValueError):
+        openmc.CylindricalMesh(r_grid=[5, 1], phi_grid=[0, pi], z_grid=[0, 10])
+
+    with pytest.raises(ValueError):
+        openmc.CylindricalMesh(r_grid=[1, 2, 4, 3], phi_grid=[0, pi], z_grid=[0, 10])
+
+    with pytest.raises(ValueError):
+        openmc.CylindricalMesh(r_grid=[1], phi_grid=[0, pi], z_grid=[0, 10])
+
+    # Test invalid phi_grid values
+    with pytest.raises(ValueError):
+        openmc.CylindricalMesh(r_grid=[0, 1, 2], phi_grid=[-1, 3], z_grid=[0, 10])
+
+    with pytest.raises(ValueError):
+        openmc.CylindricalMesh(
+            r_grid=[0, 1, 2],
+            phi_grid=[0, 2*pi + 0.1],
+            z_grid=[0, 10]
+        )
+
+    with pytest.raises(ValueError):
+        openmc.CylindricalMesh(r_grid=[0, 1, 2], phi_grid=[pi], z_grid=[0, 10])
+
+    # Test invalid z_grid values
+    with pytest.raises(ValueError):
+        openmc.CylindricalMesh(r_grid=[0, 1, 2], phi_grid=[0, pi], z_grid=[5])
+
+    with pytest.raises(ValueError):
+        openmc.CylindricalMesh(r_grid=[0, 1, 2], phi_grid=[0, pi], z_grid=[5, 1])
+
+    with pytest.raises(ValueError):
+        openmc.CylindricalMesh(r_grid=[1, 2, 4, 3], phi_grid=[0, pi], z_grid=[0, 10, 5])
+
+
 def test_centroids():
     # regular mesh
     mesh = openmc.RegularMesh()