What Counts as a Warm-Season Grass
Warm-season grasses are the lawn types that green up later in spring, grow most actively during the heat of summer, and go dormant (often turning brown) with the first hard frosts of fall. Common warm-season lawn grasses include Bermuda, Zoysia, St. Augustine, Centipede, and Bahia. These are typically found in the southern half of the US, roughly from the Transition Zone southward, though exact zones vary by region and microclimate.
If your lawn stays green through winter and starts slowing down in summer heat instead of thriving in it, you likely have a cool-season grass (like fescue, Kentucky bluegrass, or ryegrass) instead, and a warm-season calendar won’t match your lawn’s actual needs.
Because exact timing shifts with your local climate and the specific grass variety, treat the months below as a general guide rather than exact dates for your yard.
Spring (Green-Up and Early Growth)
Warm-season grasses typically break dormancy later than cool-season lawns, often not showing consistent green-up until soil temperatures warm into the 60s°F. Early spring is generally a good time to clean up winter debris, do a first light mow once green-up is underway, and have your soil tested if you haven’t recently. Many sources recommend holding off on nitrogen fertilizer until the lawn has mostly greened up and is actively growing, since feeding a still-dormant lawn tends to feed weeds more than grass.
Late Spring to Early Summer (Peak Establishment and Growth)
Once a warm-season lawn is fully green and actively growing, late spring into early summer is generally considered the best window for aeration, dethatching, and overseeding or sodding bare areas — the grass has enough of the growing season left to recover and establish before summer stress sets in. This is also typically when the first rounds of fertilizer go down, timed to your region’s guidance.
Summer (Peak Growing Season)
Summer is when warm-season grasses do most of their growing, which also means mowing frequency usually needs to increase to keep up with growth and avoid removing more than about a third of the blade height at once. Watering deeply but less frequently, rather than light daily watering, is the approach most sources recommend to encourage deeper root growth and better drought tolerance. In extended periods of 90-100°F heat, many lawn care sources suggest watering early in the morning and being cautious about mowing during the hottest part of the day to reduce stress on the turf.
For the specific question of how long to run sprinklers in 100-degree weather, the honest answer is that it depends heavily on your soil type, sprinkler output, and local water restrictions — a soil moisture check a few inches down is a more reliable guide than a fixed number of minutes.
Early Fall (Slowing Down)
As temperatures cool, warm-season grass growth begins slowing down well before the lawn turns fully brown. This is generally a reasonable time to make a final fertilizer application if your region’s guidance calls for one, though many sources caution against heavy late-season nitrogen that can push weak new growth right before dormancy. It’s also a good time to deal with any lingering weeds while the lawn is still actively competing with them.
Late Fall Into Winter (Dormancy)
Once nighttime temperatures consistently drop into the 40s°F and below, warm-season grasses typically go dormant and turn brown or tan, which is a normal protective response rather than a sign the lawn is dead (our guide to dormant grass covers this in more detail, including how to tell dormant from dead). Mowing frequency drops off naturally as growth stops. During dormancy, the main tasks are usually light cleanup (leaves, debris) and avoiding heavy foot traffic on the dormant turf, which can be more easily damaged while it’s not actively growing.
How This Differs From a Cool-Season Schedule
A cool-season lawn’s calendar is essentially inverted: it grows most actively in spring and fall, often struggles through summer heat, and may stay green (though not growing much) through a mild winter. If you’re trying to match a schedule to a fescue, bluegrass, or ryegrass lawn instead, the timing and priorities above won’t line up well — you’d want a cool-season-specific approach instead.
Several of the month-specific questions homeowners search — like whether it’s too late to mow in a given month, or whether grass is still growing at all — depend heavily on which grass type you have. Our articles on mowing in November and when grass stops growing cover those dormancy and growth-cycle questions in more detail for both grass types.
FAQ
What are the best warm-season grasses? Bermuda, Zoysia, St. Augustine, Centipede, and Bahia are the most commonly recommended warm-season lawn grasses, each with different tolerances for shade, foot traffic, and drought. The “best” choice generally depends on your specific climate, sun exposure, and how the lawn is used.
How long should you water your grass when it is 100 degrees? There’s no single safe number of minutes, since it depends on your soil, sprinkler system, and grass type. A more reliable approach is watering deeply (checking that moisture reaches a few inches into the soil) in early morning, and adjusting based on how the lawn responds rather than a fixed schedule.
What month are you not supposed to mow your lawn? Rather than a specific month, the better guideline is to stop mowing once the grass has gone dormant for the season and growth has stalled — this timing varies by region and year. See our guide to mowing in November for more on judging the last mow by growth rather than the calendar.
What is a good lawn care schedule for cool-season grasses? Cool-season lawns generally follow an inverted version of this calendar, with the most active growth in spring and fall and a summer slowdown. Our January lawn care and seeding grass in February articles cover cool-season-relevant winter and early-spring timing in more detail.