Steve, cilantro lover here.
Harvest it before it goes bad.
Hey, I'm still trying to figure out why hot dogs come 10 to a package while buns are 8 to a package . . ? But about that cilantro, gee it is quick! And, it doesn't like hot and dry. I once asked the owner of a market how his supplier kept a steady supply of cilantro coming to him all summer. He said, "it is grown in a greenhouse."
Oh. The environment in a greenhouse can be fairly well controlled.
My very best cilantro is what I'm harvesting right now

! I may always think that

but no, the over-wintered plants are nice, big and full! Be sure and scatter some seeds very late in your growing season, DL. You will be glad you did

. Until then, as soon as it looks like it is trying to bolt - that's when I pull it up. If you take that tap root with it - it will last longer in the fridge.
Steve