How to control fire ant

apply food grade diatomaceous earth

We had an acre full of fire ant mounds. We tried everything including poison, bait, everything. We hated it but we were desperate to be rid of them. Then an old timer told us about cornmeal. It kills them because they cannot digest it! We used Jiffy because it is sweet and they readily take it back to the queen and it kills the colony. We got rid of them after one or two applications! Some mounds (and colonies) were bigger so it took a second dose to get the last of them. One small box of Jiffy is good for 5 applications. Apply more again if it rains. Jiffy is inexpensive, thoroughly kills all the ants, safe for children, pets, and the environment! I keep a few boxes of Jiffy in my pantry year round but especially in spring when we seem to find one or two mounds again. It works!

This link says it is safe. I hope it helps. https://www.thehealthyhomeeconomist.com/natural-fire-ant-killer-that-works-fast/

I sprinkle dry grits on all the ant hills and theys will die and go away!

If you can see the mounds boiling water works too.

The first safe thing that comes to mind is boiling water fresh off the stove. Give it time to settle, and do it again. I am aware of fire ants. Daughter lives in FL. They don't just bite, they bite and it becomes a watery blister.

We used boiling water, if you're not concerned about pet friendly or aesthetics over winter, I then poured bleach in afterwards & set on fire. We did this alot when living in upstate NY & New England area (NH, VT) and then re-seeding in Spring. It took several times, because we directed them away from yard & towards the woods. left nasty patches of burn, but did before Winter, so it was covered shortly afterwards.