diff --git a/docs/resources/google_compute_node_group.md b/docs/resources/google_compute_node_group.md
index d223c74c8..0cc0727c5 100644
--- a/docs/resources/google_compute_node_group.md
+++ b/docs/resources/google_compute_node_group.md
@@ -40,6 +40,10 @@ Properties that can be accessed from the `google_compute_node_group` resource:
 
   * `maintenance_policy`: Specifies how to handle instances when a node in the group undergoes maintenance. Set to one of: DEFAULT, RESTART_IN_PLACE, or MIGRATE_WITHIN_NODE_GROUP. The default value is DEFAULT.
 
+  * `maintenance_window`: contains properties for the timeframe of maintenance
+
+    * `start_time`: instances.start time of the window. This must be in UTC format that resolves to one of 00:00, 04:00, 08:00, 12:00, 16:00, or 20:00. For example, both 13:00-5 and 08:00 are valid.
+
   * `autoscaling_policy`: If you use sole-tenant nodes for your workloads, you can use the node group autoscaler to automatically manage the sizes of your node groups.
 
     * `mode`: The autoscaling mode. Set to one of the following:   - OFF: Disables the autoscaler.   - ON: Enables scaling in and scaling out.   - ONLY_SCALE_OUT: Enables only scaling out.   You must use this mode if your node groups are configured to   restart their hosted VMs on minimal servers.
diff --git a/docs/resources/google_compute_node_groups.md b/docs/resources/google_compute_node_groups.md
index 56e61c30d..ddedf9bd2 100644
--- a/docs/resources/google_compute_node_groups.md
+++ b/docs/resources/google_compute_node_groups.md
@@ -31,6 +31,7 @@ See [google_compute_node_group.md](google_compute_node_group.md) for more detail
   * `node_templates`: an array of `google_compute_node_group` node_template
   * `sizes`: an array of `google_compute_node_group` size
   * `maintenance_policies`: an array of `google_compute_node_group` maintenance_policy
+  * `maintenance_windows`: an array of `google_compute_node_group` maintenance_window
   * `autoscaling_policies`: an array of `google_compute_node_group` autoscaling_policy
   * `zones`: an array of `google_compute_node_group` zone
 
diff --git a/libraries/google/compute/property/nodegroup_maintenance_window.rb b/libraries/google/compute/property/nodegroup_maintenance_window.rb
new file mode 100644
index 000000000..b776546d5
--- /dev/null
+++ b/libraries/google/compute/property/nodegroup_maintenance_window.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: false
+
+# ----------------------------------------------------------------------------
+#
+#     ***     AUTO GENERATED CODE    ***    AUTO GENERATED CODE     ***
+#
+# ----------------------------------------------------------------------------
+#
+#     This file is automatically generated by Magic Modules and manual
+#     changes will be clobbered when the file is regenerated.
+#
+#     Please read more about how to change this file in README.md and
+#     CONTRIBUTING.md located at the root of this package.
+#
+# ----------------------------------------------------------------------------
+module GoogleInSpec
+  module Compute
+    module Property
+      class NodeGroupMaintenanceWindow
+        attr_reader :start_time
+
+        def initialize(args = nil, parent_identifier = nil)
+          return if args.nil?
+          @parent_identifier = parent_identifier
+          @start_time = args['startTime']
+        end
+
+        def to_s
+          "#{@parent_identifier} NodeGroupMaintenanceWindow"
+        end
+      end
+    end
+  end
+end
diff --git a/libraries/google_compute_node_group.rb b/libraries/google_compute_node_group.rb
index a9f9cf5cc..65d9bcdde 100644
--- a/libraries/google_compute_node_group.rb
+++ b/libraries/google_compute_node_group.rb
@@ -15,6 +15,7 @@
 # ----------------------------------------------------------------------------
 require 'gcp_backend'
 require 'google/compute/property/nodegroup_autoscaling_policy'
+require 'google/compute/property/nodegroup_maintenance_window'
 
 # A provider to manage Compute Engine resources.
 class ComputeNodeGroup < GcpResourceBase
@@ -29,6 +30,7 @@ class ComputeNodeGroup < GcpResourceBase
   attr_reader :node_template
   attr_reader :size
   attr_reader :maintenance_policy
+  attr_reader :maintenance_window
   attr_reader :autoscaling_policy
   attr_reader :zone
 
@@ -46,6 +48,7 @@ def parse
     @node_template = @fetched['nodeTemplate']
     @size = @fetched['size']
     @maintenance_policy = @fetched['maintenancePolicy']
+    @maintenance_window = GoogleInSpec::Compute::Property::NodeGroupMaintenanceWindow.new(@fetched['maintenanceWindow'], to_s)
     @autoscaling_policy = GoogleInSpec::Compute::Property::NodeGroupAutoscalingPolicy.new(@fetched['autoscalingPolicy'], to_s)
     @zone = @fetched['zone']
   end
diff --git a/libraries/google_compute_node_groups.rb b/libraries/google_compute_node_groups.rb
index 682505e59..ff2739c56 100644
--- a/libraries/google_compute_node_groups.rb
+++ b/libraries/google_compute_node_groups.rb
@@ -29,6 +29,7 @@ class ComputeNodeGroups < GcpResourceBase
   filter_table_config.add(:node_templates, field: :node_template)
   filter_table_config.add(:sizes, field: :size)
   filter_table_config.add(:maintenance_policies, field: :maintenance_policy)
+  filter_table_config.add(:maintenance_windows, field: :maintenance_window)
   filter_table_config.add(:autoscaling_policies, field: :autoscaling_policy)
   filter_table_config.add(:zones, field: :zone)
 
@@ -76,6 +77,7 @@ def transformers
       'nodeTemplate' => ->(obj) { return :node_template, obj['nodeTemplate'] },
       'size' => ->(obj) { return :size, obj['size'] },
       'maintenancePolicy' => ->(obj) { return :maintenance_policy, obj['maintenancePolicy'] },
+      'maintenanceWindow' => ->(obj) { return :maintenance_window, GoogleInSpec::Compute::Property::NodeGroupMaintenanceWindow.new(obj['maintenanceWindow'], to_s) },
       'autoscalingPolicy' => ->(obj) { return :autoscaling_policy, GoogleInSpec::Compute::Property::NodeGroupAutoscalingPolicy.new(obj['autoscalingPolicy'], to_s) },
       'zone' => ->(obj) { return :zone, obj['zone'] },
     }