diff --git a/wp-modules/pattern-data-handlers/pattern-data-handlers.php b/wp-modules/pattern-data-handlers/pattern-data-handlers.php
index b2bcd9d34..02cd1ac4b 100644
--- a/wp-modules/pattern-data-handlers/pattern-data-handlers.php
+++ b/wp-modules/pattern-data-handlers/pattern-data-handlers.php
@@ -12,6 +12,7 @@
 namespace PatternManager\PatternDataHandlers;
 
 use WP_Query;
+use function PatternManager\PatternPostType\get_pattern_post_type;
 
 // Exit if accessed directly.
 if ( ! defined( 'ABSPATH' ) ) {
@@ -158,7 +159,7 @@ function get_theme_patterns_with_editor_links() {
 		if ( $pattern ) {
 			$query = new WP_Query(
 				[
-					'post_type'      => 'pm_pattern',
+					'post_type'      => get_pattern_post_type(),
 					'post_title'     => $pattern['name'],
 					'posts_per_page' => 1,
 				]
@@ -169,7 +170,7 @@ function get_theme_patterns_with_editor_links() {
 				? get_edit_post_link( $post, 'localized_data' )
 				: add_query_arg(
 					[
-						'post_type' => 'pm_pattern',
+						'post_type' => get_pattern_post_type(),
 						'action'    => 'edit-pattern',
 						'name'      => $pattern['name'],
 					],
diff --git a/wp-modules/pattern-post-type/model.php b/wp-modules/pattern-post-type/model.php
index f216c1c3e..51b5d6d78 100644
--- a/wp-modules/pattern-post-type/model.php
+++ b/wp-modules/pattern-post-type/model.php
@@ -11,6 +11,7 @@
 namespace PatternManager\PatternPostType;
 
 use WP_Post;
+use WP_Query;
 use function PatternManager\PatternDataHandlers\get_pattern_by_name;
 use function PatternManager\PatternDataHandlers\get_theme_patterns;
 use function PatternManager\PatternDataHandlers\delete_pattern;
@@ -22,7 +23,7 @@
  * @param WP_Post $post The post to possibly add content to.
  */
 function get_pattern_content_from_file( $post ) {
-	if ( 'pm_pattern' !== $post->post_type ) {
+	if ( get_pattern_post_type() !== $post->post_type ) {
 		return;
 	}
 
@@ -41,7 +42,7 @@ function get_pattern_content_from_file( $post ) {
  * @param WP_Post $post The post.
  */
 function save_pattern_to_file( WP_Post $post ) {
-	if ( 'pm_pattern' !== $post->post_type ) {
+	if ( get_pattern_post_type() !== $post->post_type ) {
 		return;
 	}
 
@@ -60,7 +61,7 @@ function save_pattern_to_file( WP_Post $post ) {
 	);
 
 	// Prevent an infinite loop.
-	remove_action( 'rest_after_insert_pm_pattern', __NAMESPACE__ . '\save_pattern_to_file' );
+	remove_action( 'rest_after_insert_' . get_pattern_post_type(), __NAMESPACE__ . '\save_pattern_to_file' );
 
 	// Removes the post content, as it should be saved in the pattern .php file.
 	wp_update_post(
@@ -70,9 +71,9 @@ function save_pattern_to_file( WP_Post $post ) {
 		]
 	);
 
-	add_action( 'rest_after_insert_pm_pattern', __NAMESPACE__ . '\save_pattern_to_file' );
+	add_action( 'rest_after_insert_' . get_pattern_post_type(), __NAMESPACE__ . '\save_pattern_to_file' );
 }
-add_action( 'rest_after_insert_pm_pattern', __NAMESPACE__ . '\save_pattern_to_file' );
+add_action( 'rest_after_insert_' . get_pattern_post_type(), __NAMESPACE__ . '\save_pattern_to_file' );
 
 /**
  * Saves a meta value to the pattern file, instead of the DB.
@@ -86,7 +87,7 @@ function save_pattern_to_file( WP_Post $post ) {
  */
 function save_metadata_to_pattern_file( $override, $post_id, $meta_key, $meta_value, $previous_value ) {
 	$post = get_post( $post_id );
-	if ( 'pm_pattern' !== $post->post_type ) {
+	if ( get_pattern_post_type() !== $post->post_type ) {
 		return $override;
 	}
 
@@ -97,7 +98,7 @@ function save_metadata_to_pattern_file( $override, $post_id, $meta_key, $meta_va
 	}
 
 	// Only update the pattern if a registered meta key is being updated here (no need for core keys like _edit_lock).
-	$registered_meta_keys = array_keys( get_registered_meta_keys( 'post', 'pm_pattern' ) );
+	$registered_meta_keys = array_keys( get_registered_meta_keys( 'post', get_pattern_post_type() ) );
 	if ( ! in_array( $meta_key, $registered_meta_keys, true ) ) {
 		return $override;
 	}
@@ -141,7 +142,7 @@ function get_metadata_from_pattern_file( $override, $post_id, $meta_key, $is_sin
 		return $override;
 	}
 
-	if ( 'pm_pattern' !== $post->post_type ) {
+	if ( get_pattern_post_type() !== $post->post_type ) {
 		return $override;
 	}
 
@@ -164,7 +165,7 @@ function get_metadata_from_pattern_file( $override, $post_id, $meta_key, $is_sin
  * Redirects for pattern actions.
  */
 function redirect_pattern_actions() {
-	if ( 'pm_pattern' !== filter_input( INPUT_GET, 'post_type' ) ) {
+	if ( get_pattern_post_type() !== filter_input( INPUT_GET, 'post_type' ) ) {
 		return;
 	}
 
@@ -177,7 +178,7 @@ function redirect_pattern_actions() {
 		remove_action( 'rest_after_insert_pm_pattern', __NAMESPACE__ . '\save_pattern_to_file' );
 		$new_post = wp_insert_post(
 			[
-				'post_type'   => 'pm_pattern',
+				'post_type'   => get_pattern_post_type(),
 				'post_title'  => sanitize_text_field( filter_input( INPUT_GET, 'name' ) ),
 				'post_status' => 'publish',
 			]
@@ -195,7 +196,7 @@ function redirect_pattern_actions() {
 		update_pattern( $new_pattern );
 		$new_post = wp_insert_post(
 			[
-				'post_type'   => 'pm_pattern',
+				'post_type'   => get_pattern_post_type(),
 				'post_title'  => $new_pattern['name'],
 				'post_status' => 'publish',
 			]
@@ -224,7 +225,7 @@ function redirect_pattern_actions() {
 		remove_action( 'rest_after_insert_pm_pattern', __NAMESPACE__ . '\save_pattern_to_file' );
 		$new_post = wp_insert_post(
 			[
-				'post_type'    => 'pm_pattern',
+				'post_type'    => get_pattern_post_type(),
 				'post_title'   => $new_pattern['name'],
 				'post_status'  => 'publish',
 				'post_content' => '',
@@ -238,3 +239,35 @@ function redirect_pattern_actions() {
 	}
 }
 add_action( 'admin_init', __NAMESPACE__ . '\redirect_pattern_actions' );
+
+/**
+ * Gets the pm_pattern post IDs.
+ *
+ * @return int[]
+ */
+function get_pm_post_ids() {
+	return ( new WP_Query(
+		[
+			'post_type'      => get_pattern_post_type(),
+			'post_status'    => 'any',
+			'fields'         => 'ids',
+			'posts_per_page' => 10,
+		]
+	) )->posts;
+}
+
+/**
+ * Deletes all pm_pattern posts.
+ */
+function delete_pattern_posts() {
+	$post_ids = get_pm_post_ids();
+
+	while ( ! empty( $post_ids ) ) {
+		foreach ( $post_ids as $post_id ) {
+			wp_delete_post( $post_id, true );
+		}
+
+		$post_ids = get_pm_post_ids();
+	}
+}
+add_action( 'after_switch_theme', __NAMESPACE__ . '\delete_pattern_posts' );
diff --git a/wp-modules/pattern-post-type/pattern-post-type.php b/wp-modules/pattern-post-type/pattern-post-type.php
index 49bf60d67..1bc121090 100644
--- a/wp-modules/pattern-post-type/pattern-post-type.php
+++ b/wp-modules/pattern-post-type/pattern-post-type.php
@@ -19,14 +19,15 @@
 	exit;
 }
 
-require_once module_dir_path( __FILE__ ) . 'model.php';
 require_once module_dir_path( __FILE__ ) . 'utils.php';
+require_once module_dir_path( __FILE__ ) . 'model.php';
 
 /**
  * Create a custom post type to be used for our default post.
  */
-function pattern_post_type() {
-	$labels = array(
+function register_pattern_post_type() {
+	$post_type_key = get_pattern_post_type();
+	$labels        = array(
 		'name'          => __( 'Patterns', 'pattern-manager' ),
 		'singular_name' => __( 'Pattern', 'pattern-manager' ),
 		'add_new_item'  => __( 'Pattern Editor', 'pattern-manager' ),
@@ -34,7 +35,7 @@ function pattern_post_type() {
 	);
 
 	register_post_type(
-		'pm_pattern',
+		$post_type_key,
 		array(
 			'public'       => false,
 			'has_archive'  => false,
@@ -50,7 +51,7 @@ function pattern_post_type() {
 	);
 
 	register_post_meta(
-		'pm_pattern',
+		$post_type_key,
 		'type',
 		array(
 			'show_in_rest' => true,
@@ -60,7 +61,7 @@ function pattern_post_type() {
 	);
 
 	register_post_meta(
-		'pm_pattern',
+		$post_type_key,
 		'title',
 		array(
 			'show_in_rest' => true,
@@ -70,7 +71,7 @@ function pattern_post_type() {
 	);
 
 	register_post_meta(
-		'pm_pattern',
+		$post_type_key,
 		'name',
 		array(
 			'show_in_rest' => true,
@@ -80,7 +81,7 @@ function pattern_post_type() {
 	);
 
 	register_post_meta(
-		'pm_pattern',
+		$post_type_key,
 		'description',
 		array(
 			'show_in_rest' => true,
@@ -90,7 +91,7 @@ function pattern_post_type() {
 	);
 
 	register_post_meta(
-		'pm_pattern',
+		$post_type_key,
 		'inserter',
 		array(
 			'show_in_rest' => true,
@@ -106,7 +107,7 @@ function pattern_post_type() {
 	 * @see https://make.wordpress.org/core/2019/10/03/wp-5-3-supports-object-and-array-meta-types-in-the-rest-api/
 	 */
 	register_post_meta(
-		'pm_pattern',
+		$post_type_key,
 		'blockTypes',
 		array(
 			'show_in_rest' => array(
@@ -123,7 +124,7 @@ function pattern_post_type() {
 	);
 
 	register_post_meta(
-		'pm_pattern',
+		$post_type_key,
 		'postTypes',
 		array(
 			'show_in_rest' => array(
@@ -140,7 +141,7 @@ function pattern_post_type() {
 	);
 
 	register_post_meta(
-		'pm_pattern',
+		$post_type_key,
 		'categories',
 		array(
 			'show_in_rest' => array(
@@ -157,7 +158,7 @@ function pattern_post_type() {
 	);
 
 	register_post_meta(
-		'pm_pattern',
+		$post_type_key,
 		'keywords',
 		array(
 			'show_in_rest' => array(
@@ -173,7 +174,7 @@ function pattern_post_type() {
 		)
 	);
 }
-add_action( 'init', __NAMESPACE__ . '\pattern_post_type' );
+add_action( 'init', __NAMESPACE__ . '\register_pattern_post_type' );
 
 /**
  * Disable auto-save for this post type.
@@ -181,7 +182,7 @@ function pattern_post_type() {
  */
 function disable_autosave() {
 	global $post_type;
-	if ( 'pm_pattern' === $post_type ) {
+	if ( get_pattern_post_type() === $post_type ) {
 		wp_dequeue_script( 'autosave' );
 	}
 }
@@ -238,7 +239,7 @@ function do_the_content_things( $content ) {
  * Add style and metaboxes to pm_pattern posts when editing.
  */
 function enqueue_meta_fields_in_editor() {
-	if ( 'pm_pattern' !== get_post_type() ) {
+	if ( get_pattern_post_type() !== get_post_type() ) {
 		return;
 	}
 
@@ -284,7 +285,7 @@ function enqueue_meta_fields_in_editor() {
 function register_block_patterns() {
 	$current_screen = get_current_screen();
 
-	if ( 'pm_pattern' !== $current_screen->post_type ) {
+	if ( get_pattern_post_type() !== $current_screen->post_type ) {
 		return;
 	}
 
diff --git a/wp-modules/pattern-post-type/utils.php b/wp-modules/pattern-post-type/utils.php
index f04216c23..aa7c44fe9 100644
--- a/wp-modules/pattern-post-type/utils.php
+++ b/wp-modules/pattern-post-type/utils.php
@@ -10,6 +10,15 @@
 
 namespace PatternManager\PatternPostType;
 
+/**
+ * Gets the pattern post type.
+ *
+ * @return string
+ */
+function get_pattern_post_type(): string {
+	return 'pm_pattern';
+}
+
 /**
  * Gets the new pattern number.
  *