The Complete Seasonal Lawn Care Guide

The single biggest factor in how good a lawn looks isn't the fertilizer brand, the mower, or the seed mix. It's timing. The same task done at the wrong moment of the year can do nothing — or actively hurt the lawn. The good news: the calendar repeats. Once you know what each season actually needs, you stop guessing.

This is the playbook Jake's Lawn Care LLC uses on every property we maintain across River Forest, Westchester, and the surrounding Chicagoland area. Use it as your year-round checklist. If it sounds like more than you want to take on yourself, that's exactly what we're here for.

Spring: Wake the lawn up the right way

The first move in spring is patience. Grass doesn't grow meaningfully when nighttime temperatures stay below 50°F — so if you fire up the mower in early April just because the calendar says so, you're cutting dormant turf for nothing. Wait for consistent overnight lows above 50°F before that first mow.

When that first cut finally happens, drop the deck slightly lower than your normal height — around 2 to 2.5 inches. This clears out winter debris, dormant blades, and matted grass. After that single pass, raise the deck back up and maintain 3 to 3.5 inches for the rest of the spring. Taller grass shades the soil, crowds out weed seeds, and develops deeper roots.

Spring is also the optimal window for two tasks that pay off all year: pre-emergent weed control and fertilization. Pre-emergent must go down before weed seeds germinate — once you see crabgrass sprouting, it's already too late. If your soil compacted hard over the winter, early spring is also a reasonable secondary aeration window for cool-season lawns (though fall is still better; more on that below).

Finally, walk the property. Pick up fallen branches, rake out any matted leaf debris missed in fall, and check for thatch buildup. A clean canvas in spring makes every other task work better.

Summer: Mow smart, water smarter

Summer is where most homeowners quietly undo their spring work — usually with the hose. The single most useful lawn rule we teach customers is the one-third rule: never remove more than one-third of the grass blade in a single mowing. Scalping a stressed lawn in 90°F heat is a fast way to turn it brown.

Mow frequency rises in early summer (every 4–6 days when growth is rapid) and stretches out as the season heats up (every 6–8 days at moderate growth, less often or paused entirely during drought).

Watering: deep, infrequent, and early

Most lawns need about 1 to 1.5 inches of water per week, including rainfall. The temptation is to water a little every day. Don't. Light daily watering builds shallow roots that fail in the first dry stretch. Instead, water deeply and infrequently — long enough to push moisture six inches down into the soil, twice a week is plenty for most properties.

Time of day matters as much as quantity:

• Water before 10 AM. The grass dries during the day and evaporation is low.
• Avoid midday watering. Most of the water evaporates before reaching the roots.
• Never water at night. Leaves stay wet for hours, which is a perfect setup for fungal disease.

If you see grub activity — small irregular brown patches that lift easily like loose carpet — summer is the time to treat. And during a real drought, the kindest thing you can do is stop mowing. Wait 10–12 days after rainfall returns before you cut again.

Fall: The most important season

If we could only work on a customer's lawn for one season per year, it would be fall. Fall is when the foundation for next spring is built. Soil is still warm from summer, nights are cooler, and grass is actively pushing roots — which means it's the single best window for aeration and overseeding on cool-season lawns.

A few non-negotiables in fall:

• Aerate compacted lawns and overseed thin areas. See our aeration guide for the full step-by-step.
• Remove leaves regularly. Thick leaf layers smother grass, block sunlight, trap moisture, and breed snow mold over winter. Our fall leaf cleanup guide goes deeper on why this matters.
• Dethatch if the layer exceeds half an inch. Push a shovel into the lawn and lift a 4-inch slice. If the spongy organic layer above the soil is more than 0.5 inches, dethatch.
• Apply fall fertilizer. A late-season feeding builds root reserves the lawn will pull from all winter and the following spring.

As Sam Bauer of the University of Minnesota Turfgrass Science program puts it: leaves left on the lawn "will smother the grass and if not removed very soon, in the spring, it will inhibit growth. It can also promote snow mold diseases." That's the whole case for fall cleanup in one sentence.

Winter: Less is more

In a Chicagoland winter, the lawn is dormant. The single most useful thing you can do is stay off it. Foot traffic on frozen or dormant grass compacts the soil and damages the crowns of the grass plants — and the damage doesn't show until spring, when those tracks come back as dead lanes.

Use winter for the boring-but-important stuff: clean and store the mower, sharpen blades for the season ahead, top off oil, check belts. On rare mild stretches when grass actually shows a little growth, a light tidy-up mow can be appropriate, but it's optional.

Quick reference: mowing frequency by season

Quick reference: ideal cutting heights by grass type

What ties the whole year together

Three principles run through every season and matter more than any single product or trick:

• Right task, right time. Pre-emergent in spring. Aeration in fall. Watering at dawn, not dusk.
• Don't fight the grass. Mow taller, water deeper, and intervene less.
• Soil first. Healthy soil grows healthy turf. Aeration, organic matter, and proper pH do more than any premium bag of fertilizer.

If your lawn isn't where you want it, odds are the issue isn't one missed step — it's a series of small mistimings stacking up. The 7 most common lawn care mistakes walks through the ones we see most often.