diff --git a/esphome/dashboard/core.py b/esphome/dashboard/core.py
index 563ca1506d..f53cb7ffb1 100644
--- a/esphome/dashboard/core.py
+++ b/esphome/dashboard/core.py
@@ -103,7 +103,7 @@ class ESPHomeDashboard:
         self.loop = asyncio.get_running_loop()
         self.ping_request = asyncio.Event()
         self.entries = DashboardEntries(self)
-        self.load_ignored_devices()
+        await self.loop.run_in_executor(None, self.load_ignored_devices)
 
     def load_ignored_devices(self) -> None:
         storage_path = Path(ignored_devices_storage_path())
diff --git a/esphome/dashboard/web_server.py b/esphome/dashboard/web_server.py
index 07f7f019f8..0fed8e9c53 100644
--- a/esphome/dashboard/web_server.py
+++ b/esphome/dashboard/web_server.py
@@ -544,7 +544,7 @@ class ImportRequestHandler(BaseHandler):
 
 class IgnoreDeviceRequestHandler(BaseHandler):
     @authenticated
-    def post(self) -> None:
+    async def post(self) -> None:
         dashboard = DASHBOARD
         try:
             args = json.loads(self.request.body.decode())
@@ -576,7 +576,8 @@ class IgnoreDeviceRequestHandler(BaseHandler):
         else:
             dashboard.ignored_devices.discard(ignored_device.device_name)
 
-        dashboard.save_ignored_devices()
+        loop = asyncio.get_running_loop()
+        await loop.run_in_executor(None, dashboard.save_ignored_devices)
 
         self.set_status(204)
         self.finish()