Well I guess I did muddle it when I mentioned both freezing weather in the hill country, and weather in Austin cold enough to light a fire and make a delicious French beef stew dish, but that was not in fact freezing or even close to it.
But I don't honestly recall much weather, even with overnight lows in the 40s rather than freezing, being common in April. Late March is usually the end of it, in my recollection.