diff --git a/uptimerobot/api/monitor.go b/uptimerobot/api/monitor.go
index ce324fa..6fbcc15 100644
--- a/uptimerobot/api/monitor.go
+++ b/uptimerobot/api/monitor.go
@@ -140,6 +140,7 @@ func (client UptimeRobotApiClient) CreateMonitor(req MonitorCreateRequest) (m Mo
 	data.Add("friendly_name", req.FriendlyName)
 	data.Add("url", req.URL)
 	data.Add("type", fmt.Sprintf("%d", monitorType[req.Type]))
+	data.Add("interval", fmt.Sprintf("%d", req.Interval))
 	switch req.Type {
 	case "port":
 		data.Add("sub_type", fmt.Sprintf("%d", monitorSubType[req.SubType]))
@@ -202,6 +203,7 @@ func (client UptimeRobotApiClient) UpdateMonitor(req MonitorUpdateRequest) (m Mo
 	data.Add("friendly_name", req.FriendlyName)
 	data.Add("url", req.URL)
 	data.Add("type", fmt.Sprintf("%d", monitorType[req.Type]))
+	data.Add("interval", fmt.Sprintf("%d", req.Interval))
 	switch req.Type {
 	case "port":
 		data.Add("sub_type", fmt.Sprintf("%d", monitorSubType[req.SubType]))
diff --git a/uptimerobot/resource_uptimerobot_monitor.go b/uptimerobot/resource_uptimerobot_monitor.go
index 838914a..bb2a64f 100644
--- a/uptimerobot/resource_uptimerobot_monitor.go
+++ b/uptimerobot/resource_uptimerobot_monitor.go
@@ -126,6 +126,10 @@ func resourceMonitorCreate(d *schema.ResourceData, m interface{}) error {
 		req.HTTPPassword = d.Get("http_password").(string)
 		break
 	}
+
+	// Add optional attributes
+	req.Interval = d.Get("interval").(int)
+
 	req.AlertContacts = make([]uptimerobotapi.MonitorRequestAlertContact, len(d.Get("alert_contact").([]interface{})))
 	for k, v := range d.Get("alert_contact").([]interface{}) {
 		req.AlertContacts[k] = uptimerobotapi.MonitorRequestAlertContact{
@@ -188,6 +192,10 @@ func resourceMonitorUpdate(d *schema.ResourceData, m interface{}) error {
 		req.HTTPPassword = d.Get("http_password").(string)
 		break
 	}
+
+	// Add optional attributes
+	req.Interval = d.Get("interval").(int)
+
 	req.AlertContacts = make([]uptimerobotapi.MonitorRequestAlertContact, len(d.Get("alert_contact").([]interface{})))
 	for k, v := range d.Get("alert_contact").([]interface{}) {
 		req.AlertContacts[k] = uptimerobotapi.MonitorRequestAlertContact{
diff --git a/uptimerobot/resource_uptimerobot_monitor_test.go b/uptimerobot/resource_uptimerobot_monitor_test.go
index 0f76811..5917158 100644
--- a/uptimerobot/resource_uptimerobot_monitor_test.go
+++ b/uptimerobot/resource_uptimerobot_monitor_test.go
@@ -12,6 +12,38 @@ import (
 )
 
 func TestUptimeRobotDataResourceMonitor_http_monitor(t *testing.T) {
+	var FriendlyName = "TF Test: http monitor"
+	var Type = "http"
+	var URL = "https://google.com"
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckMonitorDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: fmt.Sprintf(`
+				resource "uptimerobot_monitor" "test" {
+					friendly_name = "%s"
+					type          = "%s"
+					url           = "%s"
+				}
+				`, FriendlyName, Type, URL),
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "friendly_name", FriendlyName),
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "type", Type),
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "url", URL),
+				),
+			},
+			resource.TestStep{
+				ResourceName:      "uptimerobot_monitor.test",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+		},
+	})
+}
+
+func TestUptimeRobotDataResourceMonitor_change_url(t *testing.T) {
 	var FriendlyName = "TF Test: http monitor"
 	var Type = "http"
 	var URL = "https://google.com"
@@ -23,7 +55,8 @@ func TestUptimeRobotDataResourceMonitor_http_monitor(t *testing.T) {
 		Steps: []resource.TestStep{
 			resource.TestStep{
 				Config: fmt.Sprintf(`
-				resource "uptimerobot_monitor" "test" { friendly_name = "%s"
+				resource "uptimerobot_monitor" "test" {
+					friendly_name = "%s"
 					type          = "%s"
 					url           = "%s"
 				}
@@ -42,7 +75,8 @@ func TestUptimeRobotDataResourceMonitor_http_monitor(t *testing.T) {
 			// Change url
 			resource.TestStep{
 				Config: fmt.Sprintf(`
-				resource "uptimerobot_monitor" "test" { friendly_name = "%s"
+				resource "uptimerobot_monitor" "test" {
+					friendly_name = "%s"
 					type          = "%s"
 					url           = "%s"
 				}
@@ -94,6 +128,63 @@ func TestUptimeRobotDataResourceMonitor_ping_monitor(t *testing.T) {
 	})
 }
 
+func TestUptimeRobotDataResourceMonitor_custom_interval(t *testing.T) {
+	var FriendlyName = "TF Test: ping monitor"
+	var Type = "ping"
+	var URL = "1.1.1.1"
+	var Interval = 300
+	var Interval2 = 360
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckMonitorDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: fmt.Sprintf(`
+				resource "uptimerobot_monitor" "test" {
+					friendly_name = "%s"
+					type          = "%s"
+					url           = "%s"
+					interval      = %d
+				}
+				`, FriendlyName, Type, URL, Interval),
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "friendly_name", FriendlyName),
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "type", Type),
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "url", URL),
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "interval", fmt.Sprintf(`%d`, Interval)),
+				),
+			},
+			resource.TestStep{
+				ResourceName:      "uptimerobot_monitor.test",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+			resource.TestStep{
+				Config: fmt.Sprintf(`
+				resource "uptimerobot_monitor" "test" {
+					friendly_name = "%s"
+					type          = "%s"
+					url           = "%s"
+					interval      = %d
+				}
+				`, FriendlyName, Type, URL, Interval2),
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "friendly_name", FriendlyName),
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "type", Type),
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "url", URL),
+					resource.TestCheckResourceAttr("uptimerobot_monitor.test", "interval", fmt.Sprintf(`%d`, Interval2)),
+				),
+			},
+			resource.TestStep{
+				ResourceName:      "uptimerobot_monitor.test",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+		},
+	})
+}
+
 func TestUptimeRobotDataResourceMonitor_http_auth_monitor(t *testing.T) {
 	var FriendlyName = "TF Test: http auth monitor"
 	var Type = "http"