Lawn Care Calendar: What to Do and When

Start with your grass type

Lawn care timing depends on one big question: what grass do you have? Grasses fall into two broad groups. Cool-season grasses, including Kentucky bluegrass, perennial ryegrass and fescues, grow most actively in spring and fall and slow in summer heat. They are the main choice across the northern United States and in cooler parts of the transition zone. Warm-season grasses, including Bermuda, zoysia, St. Augustine, centipede and bahia, grow most actively in summer heat and go dormant and brown after frost. They dominate the southern tier.

The transition zone, a band running roughly across the middle of the country, can grow both types with difficulty, and lawns there often need extra attention. If you are not sure what you have, collect a small sample and take it to your cooperative extension office or a local garden center for identification. A lawn care provider should also be able to tell you.

Everything below is a general framework. Your local extension service publishes lawn calendars specific to your region and should override anything generic, including this guide. Also check local rules about fertilizer timing, watering restrictions and weed-control products, since these vary by city and state.

Cool-season lawn calendar

Early spring: Clean up debris, and wait for the soil to firm before heavy foot traffic. Begin mowing as the grass starts to grow. Many programs apply a pre-emergent weed preventer around the time soil temperatures begin to rise, timed to local conditions. Be aware that pre-emergents also prevent grass seed from germinating, so do not overseed at the same time.

Late spring: Mow regularly, at a taller setting as temperatures rise. A light feeding may be appropriate, but heavy spring nitrogen can push growth that struggles in summer heat. Spot-treat broadleaf weeds as needed.

Summer: Raise your mowing height, water deeply and infrequently if allowed, and avoid heavy fertilizing. Cool-season grass may go semi-dormant in drought and recover in cooler weather. Monitor for grubs and disease.

Early fall: This is the prime season for cool-season lawns. Core aerate, overseed, and feed. Keep new seed moist. Fall is also an effective time to control perennial broadleaf weeds, as they move energy into roots.

Late fall: Keep mowing until growth stops, remove or mulch leaves, and consider a final feeding as advised locally. Drain irrigation systems in cold regions.

Warm-season lawn calendar

Late winter to early spring: As the lawn begins to green, clean up debris and, where appropriate, apply a pre-emergent to prevent summer annual weeds. Wait to fertilize until the grass is actively growing, since early feeding mostly feeds weeds.

Late spring: This is the time to wake up the lawn. Mow at the recommended height for your species, aerate if compacted, dethatch if there is excess thatch, and begin fertilizing. Overseeding or sodding warm-season grass is done now, when soil is warm.

Summer: Active growth. Mow regularly, water deeply and less frequently, and feed as your program or soil test dictates. Watch for chinch bugs, grubs, armyworms and fungal disease, depending on your region.

Early fall: Continue mowing and apply the last feeding well before the first expected frost. Late nitrogen can make grass vulnerable to cold. A fall pre-emergent can help prevent winter annual weeds.

Winter: The lawn goes dormant and brown in colder areas. Reduce traffic, keep it clear of debris, and avoid heavy fertilizing. In the warmest zones, grass may stay green or be overseeded with ryegrass for winter color.

Mowing, watering and feeding basics

Three habits drive most results. First, mow at the right height and never remove more than about one third of the blade at a time. Taller grass shades soil, grows deeper roots and resists weeds and drought. Keep mower blades sharp, since dull blades tear grass and leave ragged brown tips.

Second, water deeply and infrequently. Many extension services suggest roughly an inch of water per week from rain and irrigation combined during the growing season, though soil and weather change this. Deep watering encourages roots to grow downward. Frequent shallow watering encourages shallow roots and disease. Water in the early morning to reduce evaporation and disease.

Third, feed based on need. A soil test removes the guesswork about nutrients and pH. Use slow-release products where possible, avoid applying before heavy rain, and sweep granules off hard surfaces. Be aware of local rules limiting fertilizer timing and phosphorus use.

Weeds, pests and problems

A thick lawn is the best weed control. Most weeds exploit thin or bare areas, so fixing the conditions that thin turf, such as compaction, shade, poor mowing, or wrong grass for the site, solves more problems than spraying. Overseed bare patches, and consider changing the approach in deep shade, where turf grass may never thrive and groundcover or mulch could work better.

When treatment is needed, identify the weed or pest first. Crabgrass, clover, dandelion and nutsedge need different approaches. For insects, confirm the pest before applying a product, and check whether the damage is actually from drought or disease. Pulling back a patch of damaged turf can reveal grubs, which are usually an issue only above a certain population.

Always follow product labels exactly. Labels are legal documents, and applicators in many states must be licensed. Keep pets and children off treated areas as the label directs.

When to call a professional

Many lawn tasks are comfortable DIY: mowing, basic feeding, watering. Consider a professional for core aeration on large lawns, dethatching, soil testing interpretation, persistent weed or pest problems, renovation after drought or damage, and anything involving restricted products.

A good provider adapts to your lawn and the weather. Ask how they decide on timing, whether they use soil tests, and how they handle watering and mowing height recommendations. Ask for a written program that lists each visit and product. Most of all, look for someone who talks about building a healthy lawn rather than only applying products on a schedule.

Frequently asked questions