diff --git a/lib/enkf/hook_workflow.cpp b/lib/enkf/hook_workflow.cpp
index 7463c1c4ad..461269499c 100644
--- a/lib/enkf/hook_workflow.cpp
+++ b/lib/enkf/hook_workflow.cpp
@@ -27,6 +27,7 @@
 #include <ert/enkf/config_keys.hpp>
 #include <ert/enkf/hook_workflow.hpp>
 
+#define RUN_MODE_PRE_FIRST_UPDATE_NAME   "PRE_FIRST_UPDATE"
 #define RUN_MODE_PRE_SIMULATION_NAME     "PRE_SIMULATION"
 #define RUN_MODE_POST_SIMULATION_NAME    "POST_SIMULATION"
 #define RUN_MODE_PRE_UPDATE_NAME         "PRE_UPDATE"
@@ -88,6 +89,8 @@ hook_run_mode_enum hook_workflow_run_mode_from_name( const char * run_mode ) {
     mode = PRE_UPDATE;
   else if (strcmp( run_mode , RUN_MODE_POST_UPDATE_NAME) == 0)
     mode = POST_UPDATE;
+  else if (strcmp( run_mode , RUN_MODE_PRE_FIRST_UPDATE_NAME) == 0)
+    mode = PRE_FIRST_UPDATE;
   else {
     util_abort("%s: unrecognized run mode :%s \n",__func__ , run_mode);
     mode = POST_UPDATE; /* Dummy */
diff --git a/lib/enkf/site_config.cpp b/lib/enkf/site_config.cpp
index 9be42ec689..e03fa4c5f9 100644
--- a/lib/enkf/site_config.cpp
+++ b/lib/enkf/site_config.cpp
@@ -425,6 +425,7 @@ void site_config_add_config_items(config_parser_type * config, bool site_mode) {
     stringlist_append_copy(argv, RUN_MODE_POST_SIMULATION_NAME);
     stringlist_append_copy(argv, RUN_MODE_PRE_UPDATE_NAME);
     stringlist_append_copy(argv, RUN_MODE_POST_UPDATE_NAME);
+    stringlist_append_copy(argv, RUN_MODE_PRE_FIRST_UPDATE_NAME);
     config_schema_item_set_indexed_selection_set(item, 1, argv);
     stringlist_free( argv );
   }
diff --git a/lib/include/ert/enkf/config_keys.hpp b/lib/include/ert/enkf/config_keys.hpp
index 3ce9782fdb..1ed204fefc 100644
--- a/lib/include/ert/enkf/config_keys.hpp
+++ b/lib/include/ert/enkf/config_keys.hpp
@@ -117,6 +117,7 @@ extern "C" {
 #define  RUN_MODE_POST_SIMULATION_NAME     "POST_SIMULATION"
 #define  RUN_MODE_PRE_UPDATE_NAME          "PRE_UPDATE"
 #define  RUN_MODE_POST_UPDATE_NAME         "POST_UPDATE"
+#define  RUN_MODE_PRE_FIRST_UPDATE_NAME    "PRE_FIRST_UPDATE"
 #define  STOP_LONG_RUNNING_KEY             "STOP_LONG_RUNNING"
 #define  MAX_RUNTIME_KEY                   "MAX_RUNTIME"
 #define  TIME_MAP_KEY                      "TIME_MAP"
diff --git a/lib/include/ert/enkf/hook_workflow.hpp b/lib/include/ert/enkf/hook_workflow.hpp
index dc0c6ae944..9462b88dfe 100644
--- a/lib/include/ert/enkf/hook_workflow.hpp
+++ b/lib/include/ert/enkf/hook_workflow.hpp
@@ -29,10 +29,11 @@ extern "C" {
 #include <ert/enkf/ert_workflow_list.hpp>
 
 
-  typedef enum {PRE_SIMULATION  = 0,
-                POST_SIMULATION = 1,
-                PRE_UPDATE      = 2,
-                POST_UPDATE     = 3} hook_run_mode_enum;
+  typedef enum {PRE_SIMULATION   = 0,
+                POST_SIMULATION  = 1,
+                PRE_UPDATE       = 2,
+                POST_UPDATE      = 3,
+                PRE_FIRST_UPDATE = 4} hook_run_mode_enum;
 
   typedef struct hook_workflow_struct hook_workflow_type;
 
diff --git a/python/res/enkf/enums/hook_runtime_enum.py b/python/res/enkf/enums/hook_runtime_enum.py
index 034553c5ed..17c00a73e8 100644
--- a/python/res/enkf/enums/hook_runtime_enum.py
+++ b/python/res/enkf/enums/hook_runtime_enum.py
@@ -21,9 +21,11 @@ class HookRuntime(BaseCEnum):
     POST_SIMULATION = None
     PRE_UPDATE      = None
     POST_UPDATE     = None
+    PRE_FIRST_UPDATE = None
 
 
 HookRuntime.addEnum("PRE_SIMULATION"  , 0)
 HookRuntime.addEnum("POST_SIMULATION" , 1)
 HookRuntime.addEnum("PRE_UPDATE"      , 2)
 HookRuntime.addEnum("POST_UPDATE"     , 3)
+HookRuntime.addEnum("PRE_FIRST_UPDATE", 4)