Answer: September is actually the best time of year to start a new lawn. The grass roots have more time to become established during fall and spring before encountering the stress of summer heat. In addition to tilling, you may want to kill out existing weeds first and also run some basic soil tests to see if you need to adjust the pH with lime. Ideally you would till in some organic matter such as compost as well. Your local county extension should be able to help you with running the tests and interpreting the results. They should also have recommendations as to the best grass varieties to plant based on your location and soil tests. Finally, depending on the condition of your existing lawn you may be able to core aerate and use a slit seeder to overseed rather than start from scratch -- unless you have a definite need to regrade the lawn area. Good luck with your project!
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