diff --git a/README.md b/README.md
index 1f6cc907..e2294f10 100644
--- a/README.md
+++ b/README.md
@@ -112,12 +112,13 @@ jobs:
 | Name          | Description                                  | Type   |
 | ------------- | -------------------------------------------- | ------ |
 | `ghc-path`    | The path of the ghc executable _directory_   | string |
-| `cabal-path`  | The path of the cabal executable _directory_ | string |
-| `stack-path`  | The path of the stack executable _directory_ | string |
-| `cabal-store` | The path to the cabal store                  | string |
 | `ghc-exe`     | The path of the ghc _executable_             | string |
+| `cabal-path`  | The path of the cabal executable _directory_ | string |
 | `cabal-exe`   | The path of the cabal _executable_           | string |
+| `cabal-store` | The path to the cabal store                  | string |
+| `stack-path`  | The path of the stack executable _directory_ | string |
 | `stack-exe`   | The path of the stack _executable_           | string |
+| `stack-root`  | The path to the stack root                   | string |
 
 ## Version Support
 
diff --git a/action.yml b/action.yml
index 6d51148a..bc8277e9 100644
--- a/action.yml
+++ b/action.yml
@@ -26,18 +26,20 @@ inputs:
 outputs:
   ghc-path:
     description: 'The path of the ghc executable _directory_'
-  cabal-path:
-    description: 'The path of the cabal executable _directory_'
-  stack-path:
-    description: 'The path of the stack executable _directory_'
-  cabal-store:
-    description: 'The path to the cabal store'
   ghc-exe:
     description: 'The path of the ghc _executable_'
+  cabal-path:
+    description: 'The path of the cabal executable _directory_'
   cabal-exe:
     description: 'The path of the cabal _executable_'
+  cabal-store:
+    description: 'The path to the cabal store'
+  stack-path:
+    description: 'The path of the stack executable _directory_'
   stack-exe:
     description: 'The path of the stack _executable_'
+  stack-root:
+    description: 'The path to the stack root'
 runs:
   using: 'node12'
   main: 'dist/index.js'
diff --git a/dist/action.yml b/dist/action.yml
index 6d51148a..bc8277e9 100644
--- a/dist/action.yml
+++ b/dist/action.yml
@@ -26,18 +26,20 @@ inputs:
 outputs:
   ghc-path:
     description: 'The path of the ghc executable _directory_'
-  cabal-path:
-    description: 'The path of the cabal executable _directory_'
-  stack-path:
-    description: 'The path of the stack executable _directory_'
-  cabal-store:
-    description: 'The path to the cabal store'
   ghc-exe:
     description: 'The path of the ghc _executable_'
+  cabal-path:
+    description: 'The path of the cabal executable _directory_'
   cabal-exe:
     description: 'The path of the cabal _executable_'
+  cabal-store:
+    description: 'The path to the cabal store'
+  stack-path:
+    description: 'The path of the stack executable _directory_'
   stack-exe:
     description: 'The path of the stack _executable_'
+  stack-root:
+    description: 'The path to the stack root'
 runs:
   using: 'node12'
   main: 'dist/index.js'
diff --git a/dist/index.js b/dist/index.js
index 4f015b2b..f4d6403c 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -8728,7 +8728,15 @@ async function cabalConfig() {
         for (const [t, { resolved }] of Object.entries(opts).filter(o => o[1].enable))
             await core.group(`Installing ${t} version ${resolved}`, async () => installer_1.installTool(t, resolved, process.platform));
         if (opts.stack.setup)
-            await core.group('Pre-installing GHC with stack', async () => exec_1.exec('stack', ['setup', opts.ghc.resolved]));
+            await core.group('Pre-installing GHC with stack', async () => {
+                await exec_1.exec('stack', ['setup', opts.ghc.resolved]);
+                if (process.platform === 'win32') {
+                    core.setOutput('stack-root', 'C:\\sr');
+                }
+                else {
+                    core.setOutput('stack-root', `${process.env.HOME}/.stack`);
+                }
+            });
         if (opts.cabal.enable)
             await core.group('Setting up cabal', async () => {
                 await exec_1.exec('cabal', ['user-config', 'update'], { silent: true });
diff --git a/src/setup-haskell.ts b/src/setup-haskell.ts
index 591ae586..e26e4fdf 100644
--- a/src/setup-haskell.ts
+++ b/src/setup-haskell.ts
@@ -26,9 +26,15 @@ async function cabalConfig(): Promise<string> {
       );
 
     if (opts.stack.setup)
-      await core.group('Pre-installing GHC with stack', async () =>
-        exec('stack', ['setup', opts.ghc.resolved])
-      );
+      await core.group('Pre-installing GHC with stack', async () => {
+        await exec('stack', ['setup', opts.ghc.resolved]);
+
+        if (process.platform === 'win32') {
+          core.setOutput('stack-root', 'C:\\sr');
+        } else {
+          core.setOutput('stack-root', `${process.env.HOME}/.stack`);
+        }
+      });
 
     if (opts.cabal.enable)
       await core.group('Setting up cabal', async () => {