diff --git a/src/registrar/tests/test_reports.py b/src/registrar/tests/test_reports.py
index 6b24da906..a1cbf1a18 100644
--- a/src/registrar/tests/test_reports.py
+++ b/src/registrar/tests/test_reports.py
@@ -233,7 +233,7 @@ class ExportDataTest(TestCase):
         )
 
         self.domain_1, _ = Domain.objects.get_or_create(
-            name="cdomain1.gov", state=Domain.State.READY, ready_at=timezone.now()
+            name="cdomain1.gov", state=Domain.State.READY, first_ready_at=timezone.now()
         )
         self.domain_2, _ = Domain.objects.get_or_create(name="adomain2.gov", state=Domain.State.DNS_NEEDED)
         self.domain_3, _ = Domain.objects.get_or_create(name="ddomain3.gov", state=Domain.State.ON_HOLD)
@@ -263,7 +263,7 @@ class ExportDataTest(TestCase):
         self.domain_10, _ = Domain.objects.get_or_create(
             name="adomain10.gov",
             state=Domain.State.READY,
-            ready_at=timezone.make_aware(datetime.combine(date.today() + timedelta(days=1), datetime.min.time())),
+            first_ready_at=timezone.make_aware(datetime.combine(date.today() + timedelta(days=1), datetime.min.time())),
         )
 
         self.domain_information_1, _ = DomainInformation.objects.get_or_create(
@@ -450,10 +450,10 @@ class ExportDataTest(TestCase):
 
     def test_export_domains_to_writer_with_date_filter_pulls_domains_in_range(self):
         """Test that domains that are
-            1. READY and their ready_at dates are in range
+            1. READY and their first_ready_at dates are in range
             2. DELETED and their deleted_at dates are in range
         are pulled when the growth report conditions are applied to export_domains_to_writed.
-        Test that ready domains are sorted by ready_at/deleted_at dates first, names second.
+        Test that ready domains are sorted by first_ready_at/deleted_at dates first, names second.
 
         We considered testing export_data_growth_to_csv which calls export_domains_to_writer
         and would have been easy to set up, but expected_content would contain created_at dates
@@ -492,8 +492,8 @@ class ExportDataTest(TestCase):
             "domain__state__in": [
                 Domain.State.READY,
             ],
-            "domain__ready_at__lt": end_date,
-            "domain__ready_at__gt": start_date,
+            "domain__first_ready_at__lt": end_date,
+            "domain__first_ready_at__gt": start_date,
         }
         filter_conditions_for_additional_domains = {
             "domain__state__in": [
diff --git a/src/registrar/utility/csv_export.py b/src/registrar/utility/csv_export.py
index fd220b891..7f078362c 100644
--- a/src/registrar/utility/csv_export.py
+++ b/src/registrar/utility/csv_export.py
@@ -41,7 +41,7 @@ def write_row(writer, columns, domain_info):
         "Status": domain_info.domain.state,
         "Expiration date": domain_info.domain.expiration_date,
         "Created at": domain_info.domain.created_at,
-        "Ready at": domain_info.domain.ready_at,
+        "Ready at": domain_info.domain.first_ready_at,
         "Deleted at": domain_info.domain.deleted_at,
     }
     writer.writerow([FIELDS.get(column, "") for column in columns])
@@ -232,8 +232,8 @@ def export_data_growth_to_csv(csv_file, start_date, end_date):
     ]
     filter_condition = {
         "domain__state__in": [Domain.State.READY],
-        "domain__ready_at__lt": end_date_formatted,
-        "domain__ready_at__gt": start_date_formatted,
+        "domain__first_ready_at__lt": end_date_formatted,
+        "domain__first_ready_at__gt": start_date_formatted,
     }
 
     # We also want domains deleted between sar and end dates, sorted