Voted Best Answer
Oct 03, 2013 - 12:51 PM
Depending on the species of ants, if carpenter ants, when the nighttime temps fall below 50f since they feed at night. If other species that are daytime feeders, when the daytime temps fall below 50f.
Be sure to dump out the bait, wash the dispenser out with water (not soap) and dry it off. Then next spring when the temps warm up, replace with new Gourmet Liquid Ant Bait, and start killing ants again.