tomato leaves curling
Thank you for contacting Delaware Cooperative Extension. You may receive a short survey after the answer to this question.
Some tomato cultivars have curling of the leaves that is a normal genetic feature of those plants. However, often curling and distortion of leaves and stems is a sign of herbicide exposure or injury. It is impossible to tell for sure without seeing your plants. It is possible that some lawn herbicides affected your tomato plants, either from your lawn or your neighbor's, or even from the use of grass clippings as mulch on the garden. The plants will hopefully produce fruit normally.