diff --git a/reflex/config.py b/reflex/config.py
index 891911ca6..c51e0a25a 100644
--- a/reflex/config.py
+++ b/reflex/config.py
@@ -544,6 +544,12 @@ class EnvironmentVariables:
     # Whether to run the frontend only. Exclusive with REFLEX_BACKEND_ONLY.
     REFLEX_FRONTEND_ONLY: EnvVar[bool] = env_var(False)
 
+    # The port to run the frontend on.
+    REFLEX_FRONTEND_PORT: EnvVar[int] = env_var(None)
+
+    # The port to run the backend on.
+    REFLEX_BACKEND_PORT: EnvVar[int] = env_var(None)
+
     # Reflex internal env to reload the config.
     RELOAD_CONFIG: EnvVar[bool] = env_var(False, internal=True)
 
diff --git a/reflex/reflex.py b/reflex/reflex.py
index 340fdfd71..930261798 100644
--- a/reflex/reflex.py
+++ b/reflex/reflex.py
@@ -289,10 +289,14 @@ def run(
         envvar=environment.REFLEX_BACKEND_ONLY.name,
     ),
     frontend_port: int = typer.Option(
-        config.frontend_port, help="Specify a different frontend port."
+        config.frontend_port,
+        help="Specify a different frontend port.",
+        envvar=environment.REFLEX_FRONTEND_PORT.name,
     ),
     backend_port: int = typer.Option(
-        config.backend_port, help="Specify a different backend port."
+        config.backend_port,
+        help="Specify a different backend port.",
+        envvar=environment.REFLEX_BACKEND_PORT.name,
     ),
     backend_host: str = typer.Option(
         config.backend_host, help="Specify the backend host."