Thanx
I can boast seven species known to breed here this season, with a total of 18 Leps altogether and of course hummingbirds.
Seeing new species for the year a lot in Summer
Just yesterday I snapped the Pearl Crescent. The day before, I was visited by a Buckeye.
I also discovered Black Swallowtail eggs, round two, on my Fennel.
I have raised and released 20 Monarchs and 5 Black Swallowtails.
I have two Tiger Swallowtails in the chrysalis stage, with more on the tree.
It keeps getting better.

@Leafhead I am surprised that you get them so far north. I would have thought some of them at least were sub-tropical.

@CeliaVL
I don't know about Buckeyes, but most butterflies here either overwinter in one stage or another or migrate.
Strays like Pipeline Swallowtail and Cloudless Sulfur are Summer visitors from the South only. They cannot withstand nor escape our harsh winters and so emigrate up here anew each year.
"Annual butterflies", if you will.
One stray, the Giant Swallowtail, has at least one known resident population.
Depending on your location, Rue, Hop Tree, Wafer Ash, Gas Plant and Prickly Ash are known hosts for North America's largest butterfly.

Maybe it is your location. People situated in "green desert" settings are more apt to have difficulty attracting butterflies.
Green deserts include places like gated communities, condo and townhouse settings, and any neighborhood apt to spend a lot of time money and energy maintaining perfect lawns and finely manicured landscapes.
Useless for butterflies and other pollinators.
Hang in there though. Eventually, if you display a big enough beacon, you will attract and sustain a colony

Also, try getting as many as your neighbors involved as possible. You can expand habitat very nicely if you have cooperative and green minded neighbors.
Give out free plants over the fence, and inform them of the perils of using chemical pesticides and fertilizers. You can even schedule and advertise garden tours for your neighborhood to give people a glimpse into the beautiful world of butterflies and pollinators

Sulfur lay their eggs on Legumes (Fabaceae)
Cloudless Sulfur especially like Cassia

My only happy time of year

Thanx
This time of year gives me great joy