Answer: Poor drainage is the usual cause - freezing and thawing is another. You can smooth things out by applying topsoil in small doses. Use a half an inch at a time, spreading or sprinking onto the lawn and waiting for the grass to grow through. Once it has, spread another half inch and smooth it over the lawn. After the grass grows through the second time, you can spread another half inch over the lawn. I use a fertilizer spreader to broadcast the topsoil and then a 2 by 4 with a rope attached to drag the topsoil over the lawn. It will even out a little more each time you apply topsoil and drag the 2 x 4 over the lawn. Good luck with your projcet!
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