diff --git a/lms/djangoapps/course_home_api/progress/api.py b/lms/djangoapps/course_home_api/progress/api.py
index 53895d83232c..6f219be9f269 100644
--- a/lms/djangoapps/course_home_api/progress/api.py
+++ b/lms/djangoapps/course_home_api/progress/api.py
@@ -40,7 +40,7 @@ class _AssignmentBucket:
     """
     assignment_type: str
     num_total: int
-    last_grade_publish_date: datetime
+    last_grade_publish_date: datetime | None
     scores: list[float] = field(default_factory=list)
     visibilities: list[bool | None] = field(default_factory=list)
     included: list[bool | None] = field(default_factory=list)
@@ -52,7 +52,7 @@ def with_placeholders(cls, assignment_type: str, num_total: int, now: datetime):
         return cls(
             assignment_type=assignment_type,
             num_total=num_total,
-            last_grade_publish_date=now,
+            last_grade_publish_date=None,
             scores=[0] * num_total,
             visibilities=[None] * num_total,
             included=[None] * num_total,
@@ -168,8 +168,13 @@ def collect(self):
                 bucket.add_subsection(score, is_visible, is_included)
                 visibilities_with_due_dates = [ShowCorrectness.PAST_DUE, ShowCorrectness.NEVER_BUT_INCLUDE_GRADE]
                 if subsection_grade.show_correctness in visibilities_with_due_dates:
-                    if subsection_grade.due and subsection_grade.due > bucket.last_grade_publish_date:
-                        bucket.last_grade_publish_date = subsection_grade.due
+                    if subsection_grade.due:
+                        should_update = (
+                            bucket.last_grade_publish_date is None or
+                            subsection_grade.due > bucket.last_grade_publish_date
+                        )
+                        if should_update:
+                            bucket.last_grade_publish_date = subsection_grade.due
 
     def build_results(self) -> dict:
         """Apply drops, compute averages, and return aggregated results and total grade."""
diff --git a/lms/djangoapps/course_home_api/progress/tests/test_api.py b/lms/djangoapps/course_home_api/progress/tests/test_api.py
index 963dd419a2d2..c91b226a0e9d 100644
--- a/lms/djangoapps/course_home_api/progress/tests/test_api.py
+++ b/lms/djangoapps/course_home_api/progress/tests/test_api.py
@@ -15,7 +15,7 @@
 from types import SimpleNamespace
 
 
-def _make_subsection(fmt, earned, possible, show_corr, *, due_delta_days=None):
+def _make_subsection(fmt, earned, possible, show_corr, *, due_delta_days=None, is_included=True):
     """Build a lightweight subsection object for testing aggregation scenarios."""
     graded_total = SimpleNamespace(earned=earned, possible=possible)
     due = None
@@ -27,7 +27,7 @@ def _make_subsection(fmt, earned, possible, show_corr, *, due_delta_days=None):
         graded_total=graded_total,
         show_correctness=show_corr,
         due=due,
-        show_grades=lambda staff: True,
+        show_grades=lambda staff: is_included,
     )
 
 
@@ -63,10 +63,10 @@ def _make_subsection(fmt, earned, possible, show_corr, *, due_delta_days=None):
         'past_due_mixed_visibility',
         {'type': 'Lab', 'weight': 1.0, 'drop_count': 0, 'min_count': 2, 'short_label': 'LB'},
         [
-            _make_subsection('Lab', 0.8, 1, ShowCorrectness.PAST_DUE, due_delta_days=-1),
-            _make_subsection('Lab', 0.2, 1, ShowCorrectness.PAST_DUE, due_delta_days=+3),
+            _make_subsection('Lab', 0.8, 1, ShowCorrectness.PAST_DUE, due_delta_days=-1, is_included=True),
+            _make_subsection('Lab', 0.2, 1, ShowCorrectness.PAST_DUE, due_delta_days=+3, is_included=True),
         ],
-        {'avg': 0.4, 'weighted': 0.4, 'hidden': 'some', 'final': 0.5},
+        {'avg': 0.4, 'weighted': 0.4, 'hidden': 'some', 'final': 0.5, 'last_grade_publish_date_days': 3},
     ),
     (
         'drop_lowest_keeps_high_scores',
@@ -79,6 +79,14 @@ def _make_subsection(fmt, earned, possible, show_corr, *, due_delta_days=None):
         ],
         {'avg': 1.0, 'weighted': 1.0, 'hidden': 'none', 'final': 1.0},
     ),
+    (
+        'unreleased_with_future_due_date',
+        {'type': 'Midterm', 'weight': 1.0, 'drop_count': 0, 'min_count': 1, 'short_label': 'MT'},
+        [
+            _make_subsection('Midterm', 0.5, 1, ShowCorrectness.PAST_DUE, due_delta_days=7, is_included=False),
+        ],
+        {'avg': 0.0, 'weighted': 0.0, 'hidden': 'all', 'final': 0.0, 'last_grade_publish_date_days': 7},
+    ),
 ]
 
 
@@ -180,3 +188,6 @@ def test_aggregate_assignment_type_grade_summary_scenarios(self):
                 assert row['weighted_grade'] == expected['weighted']
                 assert row['has_hidden_contribution'] == expected['hidden']
                 assert row['num_droppable'] == policy['drop_count']
+                assert (row['last_grade_publish_date'] is not None) == (
+                    'last_grade_publish_date_days' in expected
+                )