diff --git a/sklearn/grid_search.py b/sklearn/grid_search.py
index 236ef6f411492..65902c526540d 100644
--- a/sklearn/grid_search.py
+++ b/sklearn/grid_search.py
@@ -386,6 +386,10 @@ def __init__(self, estimator, scoring=None,
     def _estimator_type(self):
         return self.estimator._estimator_type
 
+    @property
+    def classes_(self):
+        return self.best_estimator_.classes_
+
     def score(self, X, y=None):
         """Returns the score on the given data, if the estimator has been refit.