Knowledgebase
Weird dirt spots in my yard #929964
Asked April 28, 2026, 8:47 PM EDT
Larimer County Colorado
Expert Response
These are likely from nightcrawlers. As they clean their underground tunnels, they push out waste and form these mounds on top of the turf or soil. There isn't much you can do to prevent this, nor prevent the nightcrawler activity in your landscape.