diff --git a/providers/openlineage/src/airflow/providers/openlineage/plugins/listener.py b/providers/openlineage/src/airflow/providers/openlineage/plugins/listener.py
index c49880237b8a7..4b500157d3a64 100644
--- a/providers/openlineage/src/airflow/providers/openlineage/plugins/listener.py
+++ b/providers/openlineage/src/airflow/providers/openlineage/plugins/listener.py
@@ -104,7 +104,7 @@ def on_task_instance_running(
                 assert task
             dagrun = context["dag_run"]
             dag = context["dag"]
-            start_date = context["start_date"]
+            start_date = task_instance.start_date
             self._on_task_instance_running(task_instance, dag, dagrun, task, start_date)
     else:
 
diff --git a/providers/standard/src/airflow/providers/standard/operators/python.py b/providers/standard/src/airflow/providers/standard/operators/python.py
index 1eecd736f998c..56ed7306c6919 100644
--- a/providers/standard/src/airflow/providers/standard/operators/python.py
+++ b/providers/standard/src/airflow/providers/standard/operators/python.py
@@ -394,8 +394,6 @@ class _BasePythonVirtualenvOperator(PythonOperator, metaclass=ABCMeta):
         "prev_execution_date",
         "prev_execution_date_success",
     }
-    if AIRFLOW_V_3_0_PLUS:
-        PENDULUM_SERIALIZABLE_CONTEXT_KEYS.add("start_date")
 
     AIRFLOW_SERIALIZABLE_CONTEXT_KEYS = {
         "macros",
diff --git a/task_sdk/src/airflow/sdk/execution_time/task_runner.py b/task_sdk/src/airflow/sdk/execution_time/task_runner.py
index 99967579bb493..61a4f7f25bf98 100644
--- a/task_sdk/src/airflow/sdk/execution_time/task_runner.py
+++ b/task_sdk/src/airflow/sdk/execution_time/task_runner.py
@@ -139,7 +139,6 @@ def get_template_context(self) -> Context:
             # TODO: Ensure that ti.log_url and such are available to use in context
             #   especially after removal of `conf` from Context.
             "ti": self,
-            "start_date": self.start_date,
             "outlet_events": OutletEventAccessors(),
             # "inlet_events": InletEventsAccessors(task.inlets, session=session),
             "macros": MacrosAccessor(),
diff --git a/task_sdk/src/airflow/sdk/types.py b/task_sdk/src/airflow/sdk/types.py
index 795130bf37462..cdbdc225b9cf7 100644
--- a/task_sdk/src/airflow/sdk/types.py
+++ b/task_sdk/src/airflow/sdk/types.py
@@ -63,6 +63,7 @@ class RuntimeTaskInstanceProtocol(Protocol):
     map_index: int | None
     max_tries: int
     hostname: str | None = None
+    start_date: datetime
 
     def xcom_pull(
         self,
diff --git a/task_sdk/tests/execution_time/test_task_runner.py b/task_sdk/tests/execution_time/test_task_runner.py
index 5e4405165e235..0db74681f3f1a 100644
--- a/task_sdk/tests/execution_time/test_task_runner.py
+++ b/task_sdk/tests/execution_time/test_task_runner.py
@@ -823,7 +823,6 @@ def test_get_context_without_ti_context_from_server(self, mocked_parse, make_ti_
             "outlet_events": OutletEventAccessors(),
             "outlets": task.outlets,
             "run_id": "test_run",
-            "start_date": start_date,
             "task": task,
             "task_instance": runtime_ti,
             "ti": runtime_ti,
@@ -869,7 +868,6 @@ def test_get_context_with_ti_context_from_server(self, create_runtime_ti, mock_s
             "prev_end_date_success": timezone.datetime(2024, 12, 1, 1, 0, 0),
             "prev_start_date_success": timezone.datetime(2024, 12, 1, 0, 0, 0),
             "run_id": "test_run",
-            "start_date": timezone.datetime(2024, 12, 1, 1, 0),
             "task": task,
             "task_instance": runtime_ti,
             "ti": runtime_ti,