diff --git a/CHANGELOG.md b/CHANGELOG.md
index f81f899f03..3d13b176ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ All notable changes to this project will be documented in this file.
 - [GUI] Installation history tab (#3834 by: HebaruSan; reviewed: techman83)
 - [GUI] Hide fake instance creation in GUI (#3839 by: HebaruSan; reviewed: techman83)
 - [GUI] Tooltip for auto-installed checkboxes (#3842 by: HebaruSan; reviewed: techman83)
+- [Core] Default `install_to` to GameData/Mods for KSP2 (#3861 by: HebaruSan; reviewed: techman83)
 
 ### Bugfixes
 
diff --git a/CKAN.schema b/CKAN.schema
index 83d90a0e9f..cef4795c06 100644
--- a/CKAN.schema
+++ b/CKAN.schema
@@ -445,10 +445,19 @@
                     "type"        : "string",
                     "pattern"     : "^Missions"
                 },
+                {
+                    "description" : "KSP2 default mods folder",
+                    "enum"        : [ "GameData/Mods" ]
+                },
+                {
+                    "description" : "KSP2 default mods folder with subfolder",
+                    "type"        : "string",
+                    "pattern"     : "^GameData/Mods/"
+                },
                 {
                     "description" : "KSP2 BepInEx plugins folder",
                     "type"        : "string",
-                    "pattern"     : "BepInEx/plugins"
+                    "pattern"     : "^BepInEx/plugins$"
                 }
             ]
         },
diff --git a/Core/Games/KerbalSpaceProgram2.cs b/Core/Games/KerbalSpaceProgram2.cs
index 511bb7507c..fe699f7423 100644
--- a/Core/Games/KerbalSpaceProgram2.cs
+++ b/Core/Games/KerbalSpaceProgram2.cs
@@ -96,7 +96,7 @@ public string MacPath()
             return null;
         }
 
-        public string PrimaryModDirectoryRelative => "BepInEx/plugins";
+        public string PrimaryModDirectoryRelative => "GameData/Mods";
 
         public string PrimaryModDirectory(GameInstance inst)
             => CKANPathUtils.NormalizePath(
@@ -115,6 +115,8 @@ public string PrimaryModDirectory(GameInstance inst)
 
         public string[] CreateableDirs => new string[]
         {
+            "GameData",
+            "GameData/Mods",
             "BepInEx",
             "BepInEx/plugins",
         };
@@ -200,6 +202,9 @@ private GameVersion VersionFromFile(string path)
 
         public Uri RepositoryListURL => new Uri("https://raw.githubusercontent.com/KSP-CKAN/KSP2-CKAN-meta/main/repositories.json");
 
+        // Key: Allowed value of install_to
+        // Value: Relative path
+        // (PrimaryModDirectoryRelative is allowed implicitly)
         private readonly Dictionary<string, string> allowedFolders = new Dictionary<string, string>
         {
             { "BepInEx",         "BepInEx"         },
diff --git a/Spec.md b/Spec.md
index c26ec17ac1..3e800e8586 100644
--- a/Spec.md
+++ b/Spec.md
@@ -295,7 +295,7 @@ In addition a destination directive *must* be provided:
 - `install_to`: The target location where the matched file or directory should be installed.
   -  Valid values for this entry for KSP1 mods are `GameData`, `Missions`(**v1.25**), `Ships`, `Ships/SPH`(**v1.12**), `Ships/VAB`(**v1.12**), `Ships/@thumbs/VAB`(**v1.16**), `Ships/@thumbs/SPH`(**v1.16**), `Ships/Script`(**v1.29**), `Tutorial`, `Scenarios` (**v1.14**),
   and `GameRoot` (which should be used sparingly, if at all).
-  -  Valid values for this entry for KSP2 mods are `GameRoot` and `BepInEx/plugins` (**v1.32**)
+  -  Valid values for this entry for KSP2 mods are `GameRoot`, `BepInEx/plugins` (**v1.32**), and `GameData/Mods` (**v1.33**)
   -  A path to a given subfolder location can be specified *only* under `GameData` (**v1.2**);
   for example: `GameData/MyMod/Plugins`. The client *must* check this path and abort the install
   if any attempts to traverse up directories are found (eg: `GameData/../Example`).