Probably 2″ and very pretty. Was crawling on my loppers in the carport. Photo was taken on cardboard. I had used the loppers about an hour earlier on bamboo and dogwood at edge of lawn. Ground cover of vinca, creeping euonymus and virginia creeper.
I live in Nashville, TN
Your photo is of a White-marked tussock moth caterpillar.
Tussock moths are in the Lymantriidae family.
Some folks are allergic to the hairs so be careful around this caterpillar.
The female moths of this insect are wingless and therefore flightless. The males are brownish with distinct markings.
Females lay eggs that overwinter. The caterpillars come out in the spring feeding on a wide range of trees including birch, black locust, cherry , elm, hackberry, hickory, oak, willow and many others.
This is a common caterpillar to see over eastern US to TX and Canada.