I noticed ants all over my beehives starting around mid-May. I used a cinnamon barrier to keep them out of my hives, though I’m not sure how well it worked. I still see a few ants here and there, but overall they don’t seem to be as thick. In fact, I hardly ever see them anymore.
Perhaps the cold weather has them hiding underground (we’ve had frost warnings for the past few nights), but I think I noticed this last year too. The ants were bad for a while (black ants, not red ants) and then they more or less disappeared.
I’ll keep a note of this for next year and see if it holds true, that the ants show up sometime in May and are gone by July, and are never really a major pest.
AUGUST 04, 2016: My beeyard is surrounded by huge ant colonies (blank ants, not red ants), and they’re not an issue with my bees. Like I said, the ants seemed to cover most of my hives in May but were gone, for the most part, by July. I still see them walking around, picking up pieces of comb or pollen and other debris, but only a small handful here and there. Nothing epidemic. Other than putting out some cinnamon, which didn’t create an unbroken barrier, I didn’t do anything to get rid of the ants. No poison or traps or any of that. It’s probably fair to say I’ve never had a major ant problem. If I did, I’d probably build hive stands with oil motes or sticky tape around the legs. It would take a hell of an ant problem to motivate me to go that far, though.