diff --git a/test/cpp/interop/interop_server.cc b/test/cpp/interop/interop_server.cc
index a24cdc7d2d4..30bd8bfef8b 100644
--- a/test/cpp/interop/interop_server.cc
+++ b/test/cpp/interop/interop_server.cc
@@ -317,9 +317,15 @@ class TestServiceImpl : public TestService::Service {
 
 void grpc::testing::interop::RunServer(
     std::shared_ptr<ServerCredentials> creds) {
-  GPR_ASSERT(FLAGS_port != 0);
+  RunServer(creds, FLAGS_port, nullptr);
+}
+
+void grpc::testing::interop::RunServer(
+    std::shared_ptr<ServerCredentials> creds, const int port,
+    ServerStartedCondition* server_started_condition) {
+  GPR_ASSERT(port != 0);
   std::ostringstream server_address;
-  server_address << "0.0.0.0:" << FLAGS_port;
+  server_address << "0.0.0.0:" << port;
   TestServiceImpl service;
 
   SimpleRequest request;
@@ -333,6 +339,14 @@ void grpc::testing::interop::RunServer(
   }
   std::unique_ptr<Server> server(builder.BuildAndStart());
   gpr_log(GPR_INFO, "Server listening on %s", server_address.str().c_str());
+
+  // Signal that the server has started.
+  if (server_started_condition) {
+    std::unique_lock<std::mutex> lock(server_started_condition->mutex);
+    server_started_condition->server_started = true;
+    server_started_condition->condition.notify_all();
+  }
+
   while (!gpr_atm_no_barrier_load(&g_got_sigint)) {
     gpr_sleep_until(gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
                                  gpr_time_from_seconds(5, GPR_TIMESPAN)));
diff --git a/test/cpp/interop/server_helper.h b/test/cpp/interop/server_helper.h
index 6af003fe93f..1bf7db1e147 100644
--- a/test/cpp/interop/server_helper.h
+++ b/test/cpp/interop/server_helper.h
@@ -19,6 +19,7 @@
 #ifndef GRPC_TEST_CPP_INTEROP_SERVER_HELPER_H
 #define GRPC_TEST_CPP_INTEROP_SERVER_HELPER_H
 
+#include <condition_variable>
 #include <memory>
 
 #include <grpc/compression.h>
@@ -50,8 +51,27 @@ class InteropServerContextInspector {
 namespace interop {
 
 extern gpr_atm g_got_sigint;
+
+struct ServerStartedCondition {
+  std::mutex mutex;
+  std::condition_variable condition;
+  bool server_started = false;
+};
+
+/// Run gRPC interop server using port FLAGS_port.
+///
+/// \param creds The credentials associated with the server.
 void RunServer(std::shared_ptr<ServerCredentials> creds);
 
+/// Run gRPC interop server.
+///
+/// \param creds The credentials associated with the server.
+/// \param port Port to use for the server.
+/// \param server_started_condition (optional) Struct holding mutex, condition
+///     variable, and condition used to notify when the server has started.
+void RunServer(std::shared_ptr<ServerCredentials> creds, int port,
+               ServerStartedCondition* server_started_condition);
+
 }  // namespace interop
 }  // namespace testing
 }  // namespace grpc