Do you need to lime your lawn? Applying lime on your lawn is only possibly necessary in certain areas. Lime raises the pH of your soil so if you have alkaline soil lime is not something you should be using. Areas with high rainfall tend to have acidic soils while drier areas are more likely to be alkaline.
If the pH of a soil is too high or too low the plants may not be able to get existing nutrients out of the soil. Here in Utah the soils tend to have enough iron but the high pH makes it difficult for the plants receive enough iron.
Adding compost to your lawn helps moderate the pH which may make adding lime, iron, or other nutrients unnecessary.