diff --git a/src/config/parse_config.h b/src/config/parse_config.h
index f70a17d6..36905e5b 100644
--- a/src/config/parse_config.h
+++ b/src/config/parse_config.h
@@ -78,6 +78,7 @@ typedef struct {
 	int32_t ignore_maximize;
 	int32_t ignore_minimize;
 	int32_t isnosizehint;
+	int32_t atstartup;
 	int32_t indleinhibit_when_focus;
 	char *monitor;
 	int32_t offsetx;
@@ -2086,6 +2087,7 @@ bool parse_option(Config *config, char *key, char *value) {
 		rule->isnosizehint = -1;
 		rule->indleinhibit_when_focus = -1;
 		rule->isterm = -1;
+		rule->atstartup = -1;
 		rule->allow_csd = -1;
 		rule->force_fakemaximize = -1;
 		rule->force_tiled_state = -1;
@@ -2217,6 +2219,8 @@ bool parse_option(Config *config, char *key, char *value) {
 					rule->isfullscreen = atoi(val);
 				} else if (strcmp(key, "isfakefullscreen") == 0) {
 					rule->isfakefullscreen = atoi(val);
+				} else if (strcmp(key, "atstartup") == 0) {
+					rule->atstartup = atoi(val);
 				} else if (strcmp(key, "globalkeybinding") == 0) {
 					char mod_str[256], keysym_str[256];
 					sscanf(val, "%255[^-]-%255[a-zA-Z]", mod_str, keysym_str);
diff --git a/src/mango.c b/src/mango.c
index 36deda3c..48fe99c1 100644
--- a/src/mango.c
+++ b/src/mango.c
@@ -823,6 +823,7 @@ static void scroller_insert_stack(Client *c, Client *target_client,
 /* variables */
 static const char broken[] = "broken";
 static pid_t child_pid = -1;
+static uint32_t startup_time;
 static int32_t locked;
 static uint32_t locked_mods = 0;
 static void *exclusive_focus;
@@ -1496,10 +1497,14 @@ void applyrules(Client *c) {
 		if (!is_window_rule_matches(r, appid, title))
 			continue;
 
+		// rule is after 60s of startup, do not apply
+		if (r->atstartup && get_now_in_ms() - startup_time > 60 * 1000)
+			continue;
+
 		// set general properties
 		apply_rule_properties(c, r);
 
-		// // set tags
+		// set tags
 		if (r->tags > 0) {
 			newtags |= r->tags;
 		} else if (parent) {
@@ -6036,6 +6041,9 @@ void setup(void) {
 	}
 	sync_keymap = wl_event_loop_add_timer(wl_display_get_event_loop(dpy),
 										  synckeymap, NULL);
+
+	// store the startup time for at-startup rules to check against
+	startup_time = get_now_in_ms();
 #endif
 }