The answer to 'how much does grass cost in Illinois' is that the cost of grass can vary significantly depending on several factors. In general, you can expect to pay anywhere from $0.50 to $2 per square foot for sod or seed, with the average being around $1 per square foot.
The exact cost will depend on the type of grass, the quality, the supplier, and your location within Illinois. Factors like the size of your lawn, the accessibility of the site, and any unique soil or terrain conditions can also impact the final price. To get an accurate estimate, it's best to get quotes from local landscaping companies or sod suppliers in your area.