A little early but...

Stumbled upon two woollybear caterpillars last week,  They were in the grass and weeds near my house and were a little smallish.

woolybear caterpillars - Marina Kobasiuk

woolybear caterpillar - Marina Kobasiuk

I usually don"t see them until later in the summer or early in the Autumn.  They mature into the isabella tiger moth.

Andy Reago & Chrissy McClarren - Pyrrharctia isabella – Isabella Tiger Moth

Links:

Wiki - Pyrrharctia_isabella
Forecasting the Winter Using Woollybear Caterpillars