diff --git a/scripts/build_cloud_run_env_sync_plan.py b/scripts/build_cloud_run_env_sync_plan.py
index acbe19b..2a1c3da 100644
--- a/scripts/build_cloud_run_env_sync_plan.py
+++ b/scripts/build_cloud_run_env_sync_plan.py
@@ -134,6 +134,15 @@ def _should_add_local_src(candidate: Path) -> bool:
     "probe_time": "CLOUD_SCHEDULER_PROBE_TIME",
     "precheck_time": "CLOUD_SCHEDULER_PRECHECK_TIME",
 }
+NEAR_RUN_WARMUP_SCHEDULE = "43 9,15 * * 1-5"
+NEAR_RUN_WARMUP_SERVICES = frozenset(
+    {
+        "interactive-brokers-quant-live-u15998061-service",
+        "interactive-brokers-quant-live-u16608560-service",
+        "interactive-brokers-quant-live-u18336562-service",
+        "interactive-brokers-quant-live-u18308207-service",
+    }
+)
 
 # Strategy-derived vars: auto-populated from platform-config.json defaults.
 def _derive_strategy_env_defaults(strategy_config: dict) -> dict[str, str]:
@@ -450,18 +459,21 @@ def _build_target_plan(
             + "\n".join(f"  - {item}" for item in missing)
         )
 
+    scheduler = _build_scheduler_plan(
+        runtime_target=runtime_target,
+        target=target,
+        defaults=defaults,
+        env=env,
+        env_values=env_values,
+        per_service_mode=per_service_mode,
+    )
+    _validate_near_run_warmup_schedule(service_name, scheduler)
+
     return {
         "service_name": service_name,
         "strategy_profile": canonical_profile,
         "env": env_values,
-        "scheduler": _build_scheduler_plan(
-            runtime_target=runtime_target,
-            target=target,
-            defaults=defaults,
-            env=env,
-            env_values=env_values,
-            per_service_mode=per_service_mode,
-        ),
+        "scheduler": scheduler,
         "remove_env_vars": sorted(set(remove_env_vars) - set(env_values)),
     }
 
@@ -497,6 +509,20 @@ def _build_scheduler_plan(
     return scheduler
 
 
+def _validate_near_run_warmup_schedule(
+    service_name: str,
+    scheduler: Mapping[str, str],
+) -> None:
+    if service_name not in NEAR_RUN_WARMUP_SERVICES:
+        return
+    if scheduler.get("timezone") != "America/New_York":
+        raise ValueError(f"{service_name} warmup timezone must be America/New_York")
+    if scheduler.get("probe_time") != NEAR_RUN_WARMUP_SCHEDULE:
+        raise ValueError(
+            f"{service_name} warmup schedule must be {NEAR_RUN_WARMUP_SCHEDULE!r}"
+        )
+
+
 def _validate_profile_inputs(
     *,
     service_name: str,
diff --git a/tests/test_runtime_config_support.py b/tests/test_runtime_config_support.py
index a42551f..49c5d95 100644
--- a/tests/test_runtime_config_support.py
+++ b/tests/test_runtime_config_support.py
@@ -1164,6 +1164,139 @@ def test_build_cloud_run_env_sync_plan_supports_per_service_targets():
     assert u7654_mega["env"]["DCA_BASE_INVESTMENT_USD"] == "500"
 
 
+def _four_gateway_warmup_payload(probe_time: str) -> dict[str, object]:
+    gateway_targets = (
+        (
+            "interactive-brokers-quant-live-u15998061-service",
+            "live-u15998061",
+            "soxl_soxx_trend_income",
+            True,
+        ),
+        (
+            "interactive-brokers-quant-live-u16608560-service",
+            "live-u16608560",
+            "tqqq_growth_income",
+            True,
+        ),
+        (
+            "interactive-brokers-quant-live-u18336562-service",
+            "live-u18336562",
+            "russell_top50_leader_rotation",
+            False,
+        ),
+        (
+            "interactive-brokers-quant-live-u18308207-service",
+            "live-u18308207",
+            "global_etf_rotation",
+            False,
+        ),
+    )
+    targets = []
+    for service_name, account_group, strategy_profile, enabled in gateway_targets:
+        targets.append(
+            {
+                "service": service_name,
+                "account_group": account_group,
+                "runtime_target_enabled": enabled,
+                "runtime_target": {
+                    **json.loads(
+                        runtime_target_json(
+                            strategy_profile,
+                            deployment_selector=account_group,
+                            account_scope=account_group,
+                            service_name=service_name,
+                        )
+                    ),
+                    "scheduler": {
+                        "timezone": "America/New_York",
+                        "main_time": "45 15 * * 1-5",
+                        "probe_time": probe_time,
+                        "precheck_time": "45 9 * * 1-5",
+                    },
+                },
+            }
+        )
+
+    targets.append(
+        {
+            "service": "interactive-brokers-us-combo-shadow-service",
+            "account_group": "us-combo-shadow",
+            "runtime_target_enabled": False,
+            "runtime_target": {
+                **json.loads(
+                    runtime_target_json(
+                        "us_equity_combo_leveraged",
+                        dry_run_only=True,
+                        deployment_selector="us-combo-shadow",
+                        account_scope="us-combo-shadow",
+                        service_name="interactive-brokers-us-combo-shadow-service",
+                    )
+                ),
+                "scheduler": {
+                    "timezone": "America/New_York",
+                    "main_time": "45 15 * * 1-5",
+                    "probe_time": "35 9,15 * * *",
+                    "precheck_time": "45 9 * * *",
+                },
+            },
+        }
+    )
+    return {
+        "defaults": {
+            "GLOBAL_TELEGRAM_CHAT_ID": "test-chat",
+            "NOTIFY_LANG": "zh",
+            "IB_ACCOUNT_GROUP_CONFIG_SECRET_NAME": "ibkr-account-groups",
+            "EXECUTION_REPORT_GCS_URI": "gs://runtime/execution-reports",
+        },
+        "targets": targets,
+    }
+
+
+def test_build_cloud_run_env_sync_plan_generates_four_gateway_near_run_warmups() -> None:
+    payload = _four_gateway_warmup_payload("43 9,15 * * 1-5")
+    result = subprocess.run(
+        [sys.executable, str(SYNC_PLAN_SCRIPT_PATH), "--json"],
+        check=True,
+        capture_output=True,
+        text=True,
+        env={**os.environ, "CLOUD_RUN_SERVICE_TARGETS_JSON": json.dumps(payload)},
+    )
+
+    plan = json.loads(result.stdout)
+    by_service = {target["service_name"]: target for target in plan["targets"]}
+    gateway_accounts = ("u15998061", "u16608560", "u18336562", "u18308207")
+    for account in gateway_accounts:
+        service_name = f"interactive-brokers-quant-live-{account}-service"
+        assert by_service[service_name]["scheduler"] == {
+            "timezone": "America/New_York",
+            "main_time": "45 15 * * 1-5",
+            "probe_time": "43 9,15 * * 1-5",
+            "precheck_time": "45 9 * * 1-5",
+        }
+        assert f"{service_name.removesuffix('-service')}-warmup-scheduler" == (
+            f"interactive-brokers-quant-live-{account}-warmup-scheduler"
+        )
+
+    assert by_service["interactive-brokers-us-combo-shadow-service"]["scheduler"]["probe_time"] == (
+        "35 9,15 * * *"
+    )
+
+
+def test_build_cloud_run_env_sync_plan_rejects_stale_gateway_warmup_schedule() -> None:
+    payload = _four_gateway_warmup_payload("35 9,15 * * 1-5")
+    result = subprocess.run(
+        [sys.executable, str(SYNC_PLAN_SCRIPT_PATH), "--json"],
+        check=False,
+        capture_output=True,
+        text=True,
+        env={**os.environ, "CLOUD_RUN_SERVICE_TARGETS_JSON": json.dumps(payload)},
+    )
+
+    assert result.returncode != 0
+    assert "interactive-brokers-quant-live-u15998061-service" in result.stderr
+    assert "43 9,15 * * 1-5" in result.stderr
+
+
 def test_build_cloud_run_env_sync_plan_requires_target_snapshot_in_per_service_mode():
     payload = {
         "defaults": {