By default git ignores untracked files when doing stash. If those files need to be added to stash you can use -u options which tells git to include untracked files. Ignored files can be added as well if -a option is specified.

Does git stash work on unstaged files?

The marked answer, git stash --keep-index , stashes both the staged and unstaged changes. The --keep-index part merely leaves the index intact on the working copy as well.

Can I stash unstaged files?

If you have both staged and unstaged changes in your project, you can perform a stash on just the unstaged ones by using the -k flag. The staged changes will be left intact ready for a commit.