I'm in Upland, Ca and we've had what we Californians call a really cold winter so far. Mornings are in the 30's, and 50's during the afternoons. My front lawn is established, do I haven't been watering lately. The Backyard is 2 months old newly seeded tall fescue. I have blades that are probably over 4 inches long, but the majority probably barely over 2. I also have a ton of weeds and bare spots. This morning I could see a frost over the lawn. I take it that I shouldn't be watering right now, but will my new grass be able to survive?