Everyone has a measure to determine when it's fall. For most of us, it's when the leaves change color. The drive to work on the Northway starts to become more scenic and we don't mind sitting between exit 9 and 8 for ten minutes sipping our coffee as our minds get lost in autumn in New York. Evenings start to become cooler and the sun sets sooner - the kids practices start ending sooner too! Or maybe the giveaway is the "Pumpkin" flavor or scent that starts appearing in everything we eat or drink.
For me, it's when the "low tire pressure" light turns on in my Honda Accord. It turns on the the first "chilly" fall morning and will stay lit up until the giant iceburg that forms in the mall parking lot completely melts in late spring.
What's your "first sign of Fall?"