Yesterday, July 6, I found two Monarch caterpillars in Kunkletown, PA. They were on common milkweed (Asclepias syriaca). I have also seen several adult Monarchs flying around the field were I found the caterpillars.
In the next few weeks, many more Monarch caterpillars will emerge, along with another cool milkweed caterpillar, the Milkweed Tussock Moth.