I run into a lot of people who think that persimmons are not good until after a frost. The only tree I could find on my place that has a good crop is ripe now. The coolest it's been at night has been the mid-50's.
When I first moved here to the Ozarks, I could eat all the persimmons I wanted. For some reason the last 3 years there have hardly been any. The first off year, there was a hard, late freeze, but I don't know why they've done poorly the last two years.