Bring a large pot of salted water to boil. Add the pasta and cook according to the al dente package directions.
Drain pasta and cool it down with cold water.
Transfer cooled pasta to a large bowl.
Add the cheddar, green onions, and ranch dressing. See notes below
Fold ingredients together gently as to not tear the pasta
Refrigerate salad covered for approximately one hour before serving.
Just before serving, fold in crumbled bacon. See notes below