I have only seen two adult females in my neighborhood all season, and neither of them were visiting my townhome patio or deck gardens when I saw them. But some ladies have obviously been in my garden, because I am current midwifing 11 caterpillars so far. The oldest was probably hatched about 1 week ago, ~August 2nd.
I am keeping two "milkweed forests", one on my front patio and one on my deck. All of my plants are in pots. I also have protective enclosures and I move all the cats I find onto the plants I keep in those enclosures.