Black fly season in the Adirondacks lasts from late May to early June. Tourists traveling to the region during this period can take a number of precautions to ensure their safety during their stay.
The most dangerous black flies are fertilized females, because they are nourished by proteins in mammals' blood. Sunny and humid conditions are favorable to them, so they are active during the day, especially a few hours after sunrise and before sunset. Avoiding the outdoors during these times in one strategy. The flies' ability to locate potential hosts is also hampered by heavy concentrations of carbon dioxide, so campfires are effective in keeping them away.