Joe wrote:

I live in northern Illinois and have an ant problem in my yard.

In the past, I've had one ant colony (city, urban area?) that covers
an area of about 2-3 square feet with dozens of individual holes.

I have pretty much ignored this. But this year, I have two other large
areas of Ant mounds.

I use ant traps when I run across them in the house. I have excellent
results with this.

But, what can I use outside????

I suspect the ant traps would just wash away with the spring rains.

Any thoughts would be appreciated.

Joe

Diazinon granules sprinkled around the mound.