You know it's time to call us when you start noticing those telltale signs of mole activity in your yard. Fresh mounds of dirt popping up overnight, soft spongy areas when you walk across your lawn, or visible surface tunnels running through your grass are all clear indicators you've got a mole problem. Spring and fall tend to be peak activity seasons when moles are most active near the surface, but they can cause damage year-round. The sooner you address the issue, the less damage your lawn will suffer.