I noticed the first one two weeks ago, I believe it was June 3rd. Just a little yellow-green light in the unmowed grass near my flower bed. I saw several others that night. Over the past two weeks, their numbers and flights have increased, with most activity occurring after a rain on warm and humid evenings. I was hoping for more activity, but I haven't had the chance to see the trees light up like Christmas trees as they did last year. I'll keep looking.
I read in an article in the Clearfield Progress newspaper that lightning bugs are declining in some areas. In addition to beetle pesticides killing off the larva, keeping grass short can cause them problems. I'm showing my solidarity with the little night lights by not mowing 2/3 of my property. Viva la luciérnaga.