It's the larva of one of the Tiger moths, but I'm not at all certain which one.
I personally lean toward it being the larva of the Salt Marsh moth (Estigmene acrea
), but there are others that are similar.
[url=https://www.discoverlife.org/mp/20q?search=Estigmene+acrea#https://entomology.ifas.ufl.edu/creatures/veg/leaf/saltmarsh_caterpillar.htm]This page[/url] has some information about the beastie.
"Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?" - Douglas Adams