I spent The night of friday June 1st on the side of Camel's Hump. Black Flies were fairly thick and biting. No problems while hiking but they swarmed when sitting still and eating dinner. Trails are in great shape!
When on Mendon last weekend we were SWARMED with black flies but at least the mosquitos were very small in number. With sufficient reapplications of repellant we were able to avoid too many bites but with such big swarms it's hard to keep them out of the eyes, ears, nose and throat