Almost two weeks ago
The fall colors at Grand Canyon North Rim just snuck up on me.

One week ago
Seems like a week ago the Aspen showed only small patches of color.

Then temperatures dropped below freezing overnight, though not a hard freeze yet, and the fall colors now show boldly.

Shaggy Manes
I noticed these growing along a gravel road, but they were too far gone to eat.

Visitors often ask when the Aspen will go gold.

Ferns
It sort of depends on the weather.

Unknown, feel free to ID

Last year, as I look back at my photos, the fourth week in September. This year about the same.
Guess I’ll start tracking this every year.