Around here they tell you to put your pre-emergent chemicals down when the the forsythia starts to bloom. It can be difficult as you don't know if the weather is going to be right for you. I live on the side of a hill that gets pretty windy that time of year and the granular product I use is recommended on calm days only.

You do not want to disturb the soil after application as this can cause crabgrass seeds to be brought up. The pre-emergent acts like a barrier, wherever its broken you are vulnerable. So you may want to aerate first.

Unfortunately, many of the spring time lawn things all of us would like to do are at odds with each other. Like pre-emergent application prohibits or delays reseeding plans, or aeration plans. Seems like I can never do all the things I want to do to the lawn, I always have to compromise or do one thing this spring and another the spring after.

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