diff --git a/tests/integration/test_climate_custom_modes.py b/tests/integration/test_climate_custom_modes.py
new file mode 100644
index 0000000000..bbb4dc3dfa
--- /dev/null
+++ b/tests/integration/test_climate_custom_modes.py
@@ -0,0 +1,62 @@
+"""Integration test for climate custom fan modes and presets."""
+
+from __future__ import annotations
+
+from aioesphomeapi import ClimateInfo
+import pytest
+
+from .types import APIClientConnectedFactory, RunCompiledFunction
+
+
+@pytest.mark.asyncio
+async def test_climate_custom_fan_modes_and_presets(
+    yaml_config: str,
+    run_compiled: RunCompiledFunction,
+    api_client_connected: APIClientConnectedFactory,
+) -> None:
+    """Test that custom fan modes and presets are properly exposed via API."""
+    async with run_compiled(yaml_config), api_client_connected() as client:
+        # Get entities and services
+        entities, services = await client.list_entities_services()
+        climate_infos = [e for e in entities if isinstance(e, ClimateInfo)]
+        assert len(climate_infos) == 1, "Expected exactly 1 climate entity"
+
+        test_climate = climate_infos[0]
+
+        # Verify custom fan modes are exposed
+        assert hasattr(test_climate, "supported_custom_fan_modes"), (
+            "Climate should have supported_custom_fan_modes"
+        )
+        custom_fan_modes = test_climate.supported_custom_fan_modes
+        assert len(custom_fan_modes) == 3, (
+            f"Expected 3 custom fan modes, got {len(custom_fan_modes)}"
+        )
+        assert "Turbo" in custom_fan_modes, "Expected 'Turbo' in custom fan modes"
+        assert "Silent" in custom_fan_modes, "Expected 'Silent' in custom fan modes"
+        assert "Sleep Mode" in custom_fan_modes, (
+            "Expected 'Sleep Mode' in custom fan modes"
+        )
+
+        # Verify enum presets are exposed (from preset: config map)
+        assert hasattr(test_climate, "supported_presets"), (
+            "Climate should have supported_presets"
+        )
+        from aioesphomeapi import ClimatePreset
+
+        assert ClimatePreset.AWAY in test_climate.supported_presets, (
+            "Expected AWAY in enum presets"
+        )
+
+        # Verify custom string presets are exposed (from custom_presets: config list)
+        assert hasattr(test_climate, "supported_custom_presets"), (
+            "Climate should have supported_custom_presets"
+        )
+        custom_presets = test_climate.supported_custom_presets
+        assert len(custom_presets) == 3, (
+            f"Expected 3 custom presets, got {len(custom_presets)}: {custom_presets}"
+        )
+        assert "Eco Plus" in custom_presets, "Expected 'Eco Plus' in custom presets"
+        assert "Comfort" in custom_presets, "Expected 'Comfort' in custom presets"
+        assert "Vacation Mode" in custom_presets, (
+            "Expected 'Vacation Mode' in custom presets"
+        )