To me, Labor Day is the official end of Summer and kick off to Fall. Being a Midwesterner, school would agree since its beginning tended to coincide with this arrangement.
In Austin, it’s at least a couple weeks away. Phew! The sweat from walking just a couple miles during the parade at night proved it.
From the Astronomical standpoint, it is today. The Earth hits the Equinox point as it revolves around the Sun. The exact same distance we were at six months ago (or will be) to kick off Spring.
Quick myth busting to spread around. There will be idiots on the radio, TV, FaceBook, the workplace, school, etc; who will claim today is one of the only two days when you can successfully balance an egg on its smaller end. Bullshit. With enough practice, you can pull this off any day. Snopes has it covered here. I give you permission to pimp slap anyone you encounter spreading such nonsense!