Are there warning signs before a sinkhole?

Yes, there are warning signs before a sinkhole that can indicate ground instability, though not all sinkholes give obvious warning. Common signs include small circular depressions or cracks forming in ground, yard, or driveway that grow over time. Inside house, you may notice doors and windows that suddenly stick or do not close properly due to foundation shifting, cracks appearing in walls, floors, or foundation, especially stair step cracks in block walls. Outside, you may see wilting or dying vegetation in circular area, or water pooling where it did not before. In karst areas like Missouri and Florida, you may hear faint rumbling or see cloudy well water. For streets, depressions or dips in pavement, and fences or utility poles that tilt or sink can be signs. If you have well, changes in water level or turbidity can indicate subsurface movement. While some sinkholes collapse suddenly without warning, especially cover collapse sinkholes after heavy rain, many give subtle signs over weeks or months, so monitoring and reporting suspicious changes to geological survey is important.