diff --git a/.github/actions/test-par-win/action.yml b/.github/actions/test-par-win/action.yml
index 27e5e274223..2cfd04858be 100644
--- a/.github/actions/test-par-win/action.yml
+++ b/.github/actions/test-par-win/action.yml
@@ -22,7 +22,8 @@ runs:
     - name: Convert unix2dos
       shell: cmd
       run: |
-        unix2dos -n "%GITHUB_WORKSPACE%\modflow6\.github\common\test_modflow6.bat" "%TEMP%\test_modflow6.bat"
+        unix2dos -n "%GITHUB_WORKSPACE%\modflow6\.github\common\test_modflow6_parallel.bat" "%TEMP%\test_modflow6_parallel.bat"
+        unix2dos -n "%GITHUB_WORKSPACE%\modflow6\.github\common\test_modflow6_serial.bat" "%TEMP%\test_modflow6_serial.bat"
 
     - name: Test programs
       if: github.ref_name != 'master'
@@ -30,7 +31,7 @@ runs:
       env:
         REPOS_PATH: ${{ github.workspace }}
       run: |
-        "%ONEAPI_ROOT%\setvars.bat" intel64 vs2022 && "%TEMP%\test_modflow6.bat"
+        "%ONEAPI_ROOT%\setvars.bat" intel64 vs2022 && "%TEMP%\test_modflow6_parallel.bat"
 
     - name: Test programs
       if: github.ref_name == 'master'
@@ -39,4 +40,21 @@ runs:
         REPOS_PATH: ${{ github.workspace }}
         MARKERS: not developmode
       run: |
-        "%ONEAPI_ROOT%\setvars.bat" intel64 vs2022 && "%TEMP%\test_modflow6.bat"
+        "%ONEAPI_ROOT%\setvars.bat" intel64 vs2022 && "%TEMP%\test_modflow6_parallel.bat"
+
+    - name: Test programs (serial)
+      if: github.ref_name != 'master'
+      shell: cmd
+      env:
+        REPOS_PATH: ${{ github.workspace }}
+      run: |
+        "%ONEAPI_ROOT%\setvars.bat" intel64 vs2022 && "%TEMP%\test_modflow6_serial.bat"
+
+    - name: Test programs (serial)
+      if: github.ref_name == 'master'
+      shell: cmd
+      env:
+        REPOS_PATH: ${{ github.workspace }}
+        MARKERS: not developmode
+      run: |
+        "%ONEAPI_ROOT%\setvars.bat" intel64 vs2022 && "%TEMP%\test_modflow6_serial.bat"
diff --git a/.github/actions/test-par/action.yml b/.github/actions/test-par/action.yml
index b14c8e78397..5b96a2835a6 100644
--- a/.github/actions/test-par/action.yml
+++ b/.github/actions/test-par/action.yml
@@ -80,3 +80,10 @@ runs:
       env:
         REPOS_PATH: ${{ github.workspace }}
       run: pixi run autotest --parallel -k "test_par"
+
+    - name: Test programs (serial)
+      shell: bash
+      working-directory: modflow6
+      env:
+        REPOS_PATH: ${{ github.workspace }}
+      run: pixi run autotest
diff --git a/.github/common/test_modflow6.bat b/.github/common/test_modflow6_parallel.bat
similarity index 100%
rename from .github/common/test_modflow6.bat
rename to .github/common/test_modflow6_parallel.bat
diff --git a/.github/common/test_modflow6_serial.bat b/.github/common/test_modflow6_serial.bat
new file mode 100644
index 00000000000..928045bf1ae
--- /dev/null
+++ b/.github/common/test_modflow6_serial.bat
@@ -0,0 +1,4 @@
+cd "%GITHUB_WORKSPACE%\modflow6\autotest"
+where libpetsc.dll
+ldd ..\bin\mf6
+pixi run autotest -m "%MARKERS%"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ce42d365270..1e3100dd83f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -486,6 +486,12 @@ jobs:
         with:
           path: modflow6
 
+      - name: Checkout test models
+        uses: actions/checkout@v4
+        with:
+          repository: MODFLOW-USGS/modflow6-testmodels
+          path: modflow6-testmodels
+
       - name: Setup pixi
         uses: prefix-dev/setup-pixi@v0.8.1
         with: