Last night, as we were watching a really atrociously bad movie, I heard it! The first katydid of the season!
(It was very loud... while I couldn't see it, it must have been on the side of the building somewhere.)
Alex did hear one back in June while I was out of town, but neither of us heard another one since.
Jokingly I told him, as he took Bella out a couple hours later, to "let me know if you see any katydids!"
He came rushing back in about ten minutes later with something closed in his hand, saying "Come quick!"
I'm impressed that on the very first night we heard a katydid, he also found one, haha. He said he nearly stepped on the poor thing, which was sitting on the sidewalk.
So we got one of the katydid habitats set back up real quick. We even had some frozen green beans in the freezer, so heated those up and stuck those on a stick for him, ha.

Greenbean 2!
I believe this is another male, though we haven't heard him click yet. He did chow down on some green beans, though!
None of our katydid eggs from last year ever hatched. It's quite possible that they weren't fertile, as we didn't have the male and female housed together for very long (unless she'd had some relations before we caught her.) I don't know enough about their lifecycle to know if perhaps the eggs require a cold period over the winter, in which case the steady room temperature of the apartment may not have worked for them. Alas.