Its blossom drop
Check the FAQ's or do a search and you'll find a lot more info than I could tell ya

I'd guess it got too hot. My tomato plants have fruit the bottom two feet or so, then a large empty space (growth during mid-summer), then more tomatoes 4-5 feet high. Then, I don't care, because less sunlight or cooler fall temperatures make the last bunch to set inedible anyway. It is not frost that stops my harvest. Nothing worth eating ripens after labor day for me.

Tom

Conditions were not right for fruit set during your 2nd and 3rd set. This year I've been using a vibrator to tickle my flower clusters every couple days and have been getting better fruitset this year versus last year not tickling the flower clusters. Ami

Thanks for the feed back. Look like a good crop w/o 2nd and 3rd set of fruit.I planted at 2 week intervials(3 plant outs)30 plus varieties. I just woundered why? must nave been to much nitrogen. Thanks to all Bill

When my blooms don't set I take a Qtip and self pollinate them. Unles it gets too hot, that usually works for me.

I'm a newbie.... first time tomato grower.
I have plenty of blooms and plenty of small golf ball sized tomatoes on my Better Boys. How big will the tomatoes get? I planted on June 1. Is there anything I should do to get bigger fruit? When will they start ripening?
Thanks.

I am a newbie with the same problem. A Master gardener told me that the pop up storms and early high temps here in Atlanta caused her tomatoes to stop production because the plants were stressed. Mine are finally perking up and I have new fruit it seems every day. I think the cooler temps and the good steady rain we had the other day really helped.I feel your pain!