diff --git a/pandas/tests/plotting/frame/test_frame_subplots.py b/pandas/tests/plotting/frame/test_frame_subplots.py
index 16853114d93cd..511266d5786c5 100644
--- a/pandas/tests/plotting/frame/test_frame_subplots.py
+++ b/pandas/tests/plotting/frame/test_frame_subplots.py
@@ -187,9 +187,9 @@ def test_subplots_timeseries_y_axis_not_supported(self):
         data = {
             "numeric": np.array([1, 2, 5]),
             "period": [
-                pd.Period("2017-08-01 00:00:00", freq="H"),
-                pd.Period("2017-08-01 02:00", freq="H"),
-                pd.Period("2017-08-02 00:00:00", freq="H"),
+                pd.Period("2017-08-01 00:00:00", freq="h"),
+                pd.Period("2017-08-01 02:00", freq="h"),
+                pd.Period("2017-08-02 00:00:00", freq="h"),
             ],
             "categorical": pd.Categorical(
                 ["c", "b", "a"], categories=["a", "b", "c"], ordered=False
diff --git a/pandas/tests/plotting/test_datetimelike.py b/pandas/tests/plotting/test_datetimelike.py
index 7164b7a046ff2..6b709522bab70 100644
--- a/pandas/tests/plotting/test_datetimelike.py
+++ b/pandas/tests/plotting/test_datetimelike.py
@@ -927,7 +927,7 @@ def test_mixed_freq_shared_ax_twin_x(self):
     @pytest.mark.xfail(reason="TODO (GH14330, GH14322)")
     def test_mixed_freq_shared_ax_twin_x_irregular_first(self):
         # GH13341, using sharex=True
-        idx1 = date_range("2015-01-01", periods=3, freq="M")
+        idx1 = date_range("2015-01-01", periods=3, freq="ME")
         idx2 = idx1[:1].union(idx1[2:])
         s1 = Series(range(len(idx1)), idx1)
         s2 = Series(range(len(idx2)), idx2)