Protect your lawn from fire ants with Ortho Fire Ant Killer Broadcast Granules. It kills fire ant mounds in 15 minutes and protects your lawn for up to 6 months. Don't treat just the infested areas where mounds are visible, treat your entire lawn to control reinfestation of fire ants from neighboring areas. For best results apply with a Scotts spreader when ants are most active (morning or late evening), and when temperatures are between 65 and 80 Deg F. Water in after application.