QuestionsHow to growLawnsSowingPlanting a lawn now 0 Vote Up Vote Down Teresa Cullinane asked 14 years ago Am I leaving it too late to put down grass seed next weekend October 22/23rd. I have a very large lawn to plant and circumstances didn’t allow it to happen in Spring. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago September is a better month to sow grass seed as there is more heat in the soil but it will be fine in October too.