I was trimming my hedges (no idea what the plants are, sorry), late august, northwest florida, and saw a whole lot of these; I’m wondering what the heck they’ll grow up to be.
Your caterpillar is the Azalea moth caterpillar also called the Azalea caterpillar while the moth is sometimes called Major datana.
The caterpillars are very distinctive with those red legs!
You are probably pruning azalea hedges since that is the primary food for this insect, tho they have been found eating apple, red oak and bog rosemary.
This insect is found in moist boggy or swampy areas in southeastern US from MD to FL then west to AR and KS.