Extreme weather changes so far this year may be confusing carpenter ants. Winged reproductive male and female carpenter ants usually emerge from their nests to mate on warm sunny days in early spring. This year, weather has been rotating between warm and cold days in many areas resulting in some strange behavior for the ants. When the spring weather gets cold, people tend to overheat their homes tempting winged ants in building structure nests to move into the warm living space. They may fly to windows but will not crawl outdoors in cold conditions. Ants seen indoors in early spring did not come in from outdoor nests. Ants in outdoor nests will not emerge until the overnight temperatures are comfortable and food sources (insects) are available.
We have received many reports from across Canada indicating large swarms of ants this year including some species that are not normally visible until late spring and early summer. It could be a bad year! Read more about identification and control.