diff --git a/src/ops-console/pages/CampaignAssignmentTab.test.tsx b/src/ops-console/pages/CampaignAssignmentTab.test.tsx
index 22b3c9e92..531df69bc 100644
--- a/src/ops-console/pages/CampaignAssignmentTab.test.tsx
+++ b/src/ops-console/pages/CampaignAssignmentTab.test.tsx
@@ -273,6 +273,22 @@ describe('CampaignAssignmentTab', () => {
     expect(screen.getByRole('progressbar')).toBeInTheDocument();
   });
 
+  it('keeps filters disabled until campaign grade metadata is loaded', async () => {
+    api.getAllGrades.mockResolvedValue(defaultGrades);
+    api.getCampaignAssignments.mockImplementation(
+      () => new Promise(() => undefined),
+    );
+
+    renderTab('campaign-1');
+
+    await waitFor(() => expect(api.getAllGrades).toHaveBeenCalled());
+    screen
+      .getAllByRole('combobox')
+      .forEach((combobox) =>
+        expect(combobox).toHaveAttribute('aria-disabled', 'true'),
+      );
+  });
+
   it('renders the default grade filter value', async () => {
     primeApi();
 
diff --git a/src/ops-console/pages/CampaignAssignmentTab.tsx b/src/ops-console/pages/CampaignAssignmentTab.tsx
index 8f3e000d1..8cb5b67b1 100644
--- a/src/ops-console/pages/CampaignAssignmentTab.tsx
+++ b/src/ops-console/pages/CampaignAssignmentTab.tsx
@@ -180,9 +180,7 @@ const CampaignAssignmentTab: React.FC<CampaignAssignmentTabProps> = ({
       subjects.flatMap((subject) => subject.gradeIds),
     );
 
-    return relevantGradeIds.size === 0
-      ? grades
-      : grades.filter((grade) => relevantGradeIds.has(grade.id));
+    return grades.filter((grade) => relevantGradeIds.has(grade.id));
   }, [grades, subjects]);
 
   useEffect(() => {
@@ -302,7 +300,10 @@ const CampaignAssignmentTab: React.FC<CampaignAssignmentTabProps> = ({
             <FormControl
               size="small"
               className="campaign-assignment-filter"
-              disabled={isLoadingFilters}
+              disabled={
+                isLoadingFilters ||
+                (isLoadingAssignments && subjects.length === 0)
+              }
             >
               <Select
                 multiple
@@ -362,7 +363,10 @@ const CampaignAssignmentTab: React.FC<CampaignAssignmentTabProps> = ({
             <FormControl
               size="small"
               className="campaign-assignment-filter campaign-assignment-filterField"
-              disabled={isLoadingFilters}
+              disabled={
+                isLoadingFilters ||
+                (isLoadingAssignments && subjects.length === 0)
+              }
             >
               <Select
                 multiple