when to fertilize lawn in illinois

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(September 1-15)

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  • When is the best time of year to fertilize my lawn?

  • Early fall (September 1-15) is a key time for fertilizing lawns in northern Illinois. The schedule below outlines when to apply based on how many applications are to be made annually and desired lawn quality.

  • What is the best time to plant grass seed in Illinois?

  • August Mid- to end of August is the best time to seed bare areas of lawn, overseed thinning grass, or lay down sod. When seeding lawns, use grass seed appropriate to your site. The best choice for most lawns in northern Illinois is a mix of Kentucky blue grass, perennial rye, and fescue seeds.

  • When can I fertilize after sod is sodded?

  • Core aerating the lawn after the sod has firmly rooted to the soil will aid the development of a deep root system. Don’t fertilize newly sodded lawns until the next suggested time in the normal fertilizing schedule; May and September are key times.

  • What is the best fertilizer for your lawn in September?

  • Choose an organic product or a synthetic fertilizer with a 3-1-2 or 4-1-2 ratio. Moderate temperatures this month along with cool nights and adequate rainfall will spur grass growth, making September a good time to feed turf. If not done in September, fertilize lawns with a slow-release, organic fertilizer with a 4-1-2 or 3-1-2 ratio.

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