Golf Professional, Bobby Jacks, diligently monitors weather situations, alerting members as to course conditions.  If its too soggy, the carts are "on the path" and if its too cold - the course will open when its warmer. Grass becomes brittle when frozen as a result of crystallized dew.  A blade of grass contains 90% water and soon as the temperature drops, the freezing of the blade is accelerated. Stepping on a frosty tee box causes the plant to break as the cell walls rupture. This causes the greens and putting surface to become too thin, due to the weakening of the plant. Damaged grass blades also become more susceptible to disease. Reduced mowing heights can really damage greens that are covered with frost. So when the pro asks you to wait until the frost is gone, grab a cup of coffee before you tee-it-up as you're helping the course.