I recently managed to visit one of the local sunflower fields. The sunflowers started blooming during the Labor Day weekend. In an effort to avoid the crowds, I waited until this past Thursday to spend a few minutes getting pictures of the sunflowers.
The farmer at this field doesn't use pesticides, so there was no risk of being exposed. He grows these sunflowers for bird seed and doesn't harvest them until November. It was difficult finding a path through the sunflowers because there were so many of them.
I just wish that the sunflowers that I planted in one of my flowerbeds had done as well. This eastern flowerbed of mine apparently gets too much shade in the afternoon.