No, it’s not autumn.
Summer’s early. We’ve had a run of high temperatures (up to 36°C (97°F)), and, for the past handful of months, lower than average rainfall. Trees normally lose a lot of moisture through their leaves – the act of transpiration, and in order to minimise that water loss those trees drop a number of their leaves – thus the large quantity of leaves on the ground at the moment.
That’s not the end of the story. The quantity of leaves dropped in these hot, dry conditions add to the ground fuel load. Summer storms, which have already been quite violent, bring lightning which can spark bushfires (wildfires). It could be a hazardous summer ahead.
[That’s Pippin (3yo) on the left, and Skye (5½yo) on the right, waiting patiently on our driveway while I take the photograph].
lookANDsee 
I have also noticed the leaf fall on my mornings walks out here at Rocky River. However, up in the tree tops there is lots of new growth – possibly as a result of the well above average rainfall in October, September and particularly August.
Not sure about “waiting patiently”. While out and about moments of inactivity for a Border Collie are to be “obediently endured” – at least that used to be the case with my old (now deceased) Border Collie.