As September rolls into central Indiana, many homeowners start thinking about preparing their yards for the cooler months ahead. At Fine Touch Services, we get a lot of calls this time of year from clients in Indianapolis, Fishers, Carmel, Westfield, Noblesville, and beyond with one big question: “What should I be doing with my lawn and landscaping before fall hits?”

To help, we’ve put together a roundup of the most common September landscaping questions we hear, and the answers you need to keep your yard looking its best all season long.

Can I still plant grass seed in September?

Yes! September is actually one of the best months to plant grass seed in Indiana. The soil is still warm, which helps seeds germinate quickly, while cooler nights and reduced weed competition give young grass a strong start.

For Indianapolis and surrounding suburbs, aim to seed no later than the third week of September. Our region’s average first frost date is around October 15–20 (according to Purdue University Extension), so planting by late September gives your new grass three to four weeks to establish before cold weather sets in.

When should I stop mowing my lawn?

Keep mowing your lawn regularly until growth slows, usually in late October or early November in central Indiana. For your final mow of the season, cut slightly shorter than usual—around 2 to 2.5 inches—to reduce the risk of matting under snow.

In Carmel, Fishers, and other northern suburbs, growth may slow a little earlier due to slightly cooler nighttime temperatures, while downtown Indianapolis lawns often grow a week or two longer.

Should I fertilize my lawn in September?

Absolutely. A fall fertilizer application strengthens grassroots and prepares your lawn for winter. September is the ideal time to use a high-nitrogen, slow-release fertilizer. This will keep your lawn green longer into October and help it rebound quickly in spring.

Homeowners in Westfield and Noblesville often see the best results when fertilizing in mid-September, just as evening temperatures begin dropping into the 50s.

Do I need to aerate my lawn this month?

Yes, if you haven’t aerated in the last year or two, September is the perfect time. Core aeration relieves soil compaction and improves root growth. When paired with overseeding in early September, it’s one of the most effective ways to rejuvenate a tired lawn.

Lawns in Fishers, McCordsville, and Zionsville, where clay soils are common, especially benefit from annual aeration.

Should I cut back my perennials now?

It depends on the plant. Some perennials, like daylilies and hostas, can be cut back in the fall. Others, like coneflowers and black-eyed Susans, provide winter interest and food for birds if left standing.

If you’re in doubt, you can always wait until early spring for most cutbacks. That way, you also provide extra winter protection for the plant.

What about my shrubs and trees, should I prune them?

Avoid heavy pruning in September. Late-season pruning can stimulate new growth that won’t have time to harden before frost. Instead, save major pruning for late winter or early spring.

Light shaping or removing dead branches is fine, but leave the serious trimming for later.

September Landscaping Recap

September is one of the most important months for lawn and landscape care in central Indiana. With the right steps—seeding, fertilizing, mowing, and selective trimming—you’ll set your yard up for a healthy winter and a vibrant spring.

If you’d like help with lawn aeration, overseeding, or fall clean-up, our team at Fine Touch Services is here to make your outdoor space shine. Contact us today to schedule your fall landscaping services.

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