Depending on the condition of your lawn, it might not matter. If you need to reseed your entire lawn, for example, the type of grass that was already there won’t be of importance. But, if you’re looking to make some repairs rather than a complete overhaul, you’ll want to match the new grass to the current grass. If this is the case, ask the previous owner of your home if they know the grass type, or you can use context clues. Find out what grasses grow in your area (cool season or warm season grasses), and look at what makes them unique. From there, you can take a closer look at your lawn and try to match your grass. Another suggestion is to ask your neighbors if you notice they have the same kind of grass.