diff --git a/.github/workflows/test-windows-trampolines.yml b/.github/workflows/test-windows-trampolines.yml
index b84640531f..20029f1daf 100644
--- a/.github/workflows/test-windows-trampolines.yml
+++ b/.github/workflows/test-windows-trampolines.yml
@@ -10,6 +10,21 @@ env:
   RUSTUP_MAX_RETRIES: 10
 
 jobs:
+  # Verify windows crate version matches between workspaces
+  windows-version-check:
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    name: "check windows crate version"
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          persist-credentials: false
+
+      - uses: astral-sh/setup-uv@681c641aba71e4a1c380be3ab5e12ad51f415867 # v7.1.6
+
+      - name: "Check windows crate versions match"
+        run: uv run scripts/check-trampoline-version-consistency.py
+
   # Separate jobs for the nightly crate
   windows-trampoline-check:
     timeout-minutes: 15
diff --git a/scripts/check-trampoline-version-consistency.py b/scripts/check-trampoline-version-consistency.py
new file mode 100644
index 0000000000..1b1bc83657
--- /dev/null
+++ b/scripts/check-trampoline-version-consistency.py
@@ -0,0 +1,56 @@
+"""Check that the `windows` crate version matches between workspaces.
+
+The uv-trampoline crate is excluded from the main workspace (it requires nightly),
+so this script verifies that the `windows` crate version is kept in sync by
+comparing the locked versions in both Cargo.lock files.
+"""
+
+# /// script
+# requires-python = ">=3.12"
+# ///
+
+from __future__ import annotations
+
+import sys
+import tomllib
+from pathlib import Path
+
+ROOT = Path(__file__).parent.parent
+
+
+def get_locked_windows_version(lockfile_path: Path) -> str | None:
+    """Get the windows crate version from a Cargo.lock file."""
+    with open(lockfile_path, "rb") as f:
+        lockfile = tomllib.load(f)
+
+    for package in lockfile.get("package", []):
+        if package.get("name") == "windows":
+            return package.get("version")
+
+    return None
+
+
+def main() -> int:
+    main_lockfile = ROOT / "Cargo.lock"
+    trampoline_lockfile = ROOT / "crates" / "uv-trampoline" / "Cargo.lock"
+
+    main_version = get_locked_windows_version(main_lockfile)
+    trampoline_version = get_locked_windows_version(trampoline_lockfile)
+
+    print(f"workspace:       windows {main_version}")
+    print(f"uv-trampoline:   windows {trampoline_version}")
+
+    if main_version != trampoline_version:
+        print(
+            f"\n::error::windows crate version mismatch! "
+            f"workspace uses {main_version} but uv-trampoline uses {trampoline_version}",
+            file=sys.stderr,
+        )
+        return 1
+
+    print("\nVersions match.")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())