Zero days at or below freezing across three decades of Los Angeles records is the number that actually writes this calendar. Without a hard freeze, warm-season grasses like bermudagrass and St. Augustine never fully shut down — they just slow with shorter days and green back up on their own, which means the usual spring-wake-up, fall-prep rhythm other states follow doesn’t apply here the same way. Elevation changes that math fast, which is why the far north and the Sierra run on an entirely different schedule.
The short answer for California
For most of the state, the grass that actually holds through a California summer is a warm-season species. Clemson Cooperative Extension’s HGIC 1214 fact sheet lists seven of them as adapted to warm climates: Bahiagrass, Bermudagrass, Carpetgrass, Centipedegrass, Seashore Paspalum, St. Augustinegrass and Zoysiagrass. Near Los Angeles, where NOAA’s 1991-2020 climate normals record no computable freeze at all, a lawn planted in one of these never truly goes dormant from cold. It slows down with shorter days and cooler nights, then greens back up on its own once the days lengthen again.
The zone assigned to Los Angeles here is warm, set by weighing summer heat days and winter lows against the season tolerances Clemson publishes for turf, not by a single statewide rule. If you’re breaking ground on a brand-new lawn, the grading, soil and seed-bed steps covered in California Lawn Care come before any date in the calendar below matters. Higher ground, the far north of the state and the Sierra fall into a different zone entirely, which the section below works through in detail.
The frost question that anchors most state lawn calendars barely applies on the coast. NOAA’s National Centers for Environmental Information count zero days at or below 32°F at Los Angeles across thirty years of record, with the frost-free season listed at a full 365 days. Skip the frost-date search if you garden near the coast and plan around drought, heat stress and your water agency’s irrigation schedule instead, since those are the real limits here.
Working through the year
Clemson Cooperative Extension publishes a separate maintenance calendar for each warm-season species: HGIC 1216 for Bermudagrass, HGIC 1217 for Zoysiagrass, HGIC 1215 for Centipedegrass and HGIC 1218 for St. Augustinegrass. The rates below follow the Bermudagrass calendar, since it’s the species most California lawns are actually built on. If you’re growing one of the others, the mowing height and nitrogen numbers shift: check the calendar for your actual species rather than assuming Bermuda’s numbers apply, and read The Best Grass Seed for California Lawns first if you’re not sure which grass you have.
Winter
Near the coast and through the milder valleys, Bermudagrass slows growth but doesn’t die back from cold, since NOAA’s normals show essentially no freeze risk at Los Angeles. Growth is slow enough that mowing and feeding both stop. Don’t feed nitrogen while the grass is dormant or barely growing. Clemson’s HGIC 1216 calendar holds nitrogen back until active spring growth resumes, and feeding too early just feeds winter weeds instead of the lawn.
Spring
Once soil warms and the lawn is visibly greening across the whole yard, not just in patches, mowing restarts at Bermudagrass’s usual height of roughly 1 to 1.5 inches and the first nitrogen application of the season goes down. Pre-emergent herbicide for crabgrass, per Clemson’s guidance, goes down before soil temperatures hold in the mid-50s Fahrenheit for several consecutive days, the trigger crabgrass seed itself waits for. Missing that window by even a week or two lets the first flush germinate before the herbicide is in the ground, and no amount of it applied after that point does much good.
Summer
This is the season a warm-season lawn does most of its growing, and it’s also when California’s water limits bite hardest. Clemson’s calendar calls for roughly 1 inch of water a week during peak growth, split across two or three sessions rather than one long soak, though your actual allowance depends on whatever schedule your local water supplier has set for landscape irrigation. Mowing steps up to weekly or more, nitrogen applications continue through the growing months at the calendar’s rate for the species, and aeration, if the lawn is compacted, gets done now while the grass is actively growing and can heal the holes quickly.
Fall
Growth slows as days shorten. The last nitrogen feeding of the year goes down early enough that the grass hardens off before growth stops entirely, not right before dormancy sets in. Overseeding with a cool-season ryegrass for winter color is optional, purely cosmetic, and it commits you to mowing and watering two different grasses on two different schedules until spring, when the ryegrass is mowed out to let the Bermudagrass take back over.
What changes across California
The zone above describes Los Angeles, not the state. California runs from frost-free coastline to mountain winters within a few hours’ drive, and a calendar built on one city’s climate normals will be wrong for the other end of that range.
Inland valleys
The Central Valley, running from Sacramento down through Fresno and Bakersfield, sees real winter cold that the Los Angeles basin doesn’t, plus summer heat that runs hotter and drier than the coast for longer stretches. A warm-season lawn there goes properly dormant in winter, browning out rather than just slowing down, and needs more irrigation through a longer, harder summer than the same species gets near the coast.
Elevation and the north
Northern California and the Sierra Nevada foothills sit in a different turf zone entirely. Winters there bring hard freezes that the warm-season species named above don’t tolerate well, which is why a cool-season lawn is the realistic choice at elevation and through the far north, working on its own opposite calendar of growing through winter and spring, then resting through summer heat instead of winter cold.
The coast and the deserts
Coastal fog moderates summer heat wherever it reaches, from the Bay Area down through much of Los Angeles and San Diego counties, which is part of why the coastal strip runs cooler and needs less water than inland valleys just a short drive away at the same latitude. Desert valleys such as the Coachella and Imperial push the heat and water demand up again, even though the frost risk there stays as low as the coast. None of these figures apply state-wide. They describe Los Angeles specifically, and a lawn twenty miles inland or a thousand feet higher can be working on a different calendar altogether.
The mistakes this climate punishes
Feeding too late in fall
Feeding a warm-season lawn nitrogen in autumn is the most common mistake made here. It pushes soft, leafy growth right as the grass should be hardening off for its slow season, and that new growth is what shows disease and cold stress first if a hard night does arrive inland. The damage doesn’t show until winter, by which point the fall feeding that caused it is long forgotten.
Seeding cool-season grass in summer
Seeding a cool-season grass, tall fescue or ryegrass among them, through a California summer is the second. Cool-season seed germinates and grows in cool, moist soil, exactly the conditions a Los Angeles or Central Valley summer doesn’t offer, and seedlings that do sprout burn off in the first real heat wave. The species Clemson’s HGIC 1214 names as warm-season, Bermudagrass and St. Augustinegrass among them, are the ones actually built for that heat.
Cutting too short in heat
Cutting too short in hot weather punishes a lawn within days, not weeks. Scalping a warm-season lawn during peak summer heat strips the shade its own canopy provides the soil, exposes the crown to direct sun, and opens the door to weeds that germinate the moment bare soil is available. Raise the mower deck rather than lower it once summer heat sets in, the opposite instinct from what a cool-climate gardener would reach for.
Watering on a fixed daily schedule
Watering every day regardless of actual need is the mistake that costs the most water for the least lawn. Shallow, frequent watering trains roots to stay near the surface, which is exactly the wrong structure for surviving the dry stretch between one watering day and the next under most water agencies’ restricted schedules. Deep, infrequent watering is what the roughly 1-inch-a-week figure from Clemson’s calendar assumes in the first place, and it only works if the water actually reaches down where the roots are.
Checking this against your county
Every figure above comes from Los Angeles’s climate record and from Clemson’s turf calendars, not from a county-specific California source. For a reading that accounts for your own elevation, coastal fog influence or valley heat, check with the University of California Agriculture and Natural Resources, the state’s Cooperative Extension service, at ucanr.edu. Its county-level offices publish local planting and irrigation guidance that adjusts for exactly the differences described above, from Sierra foothill frost to desert valley heat.
- Your local frost history, since inland and mountain counties freeze while the coast does not
- Which warm-season or cool-season species your existing lawn actually is
- Your water agency’s irrigation-day restrictions, which often override any inches-per-week figure
Start with those three checks before applying any date in this calendar, since the whole schedule shifts with the grass and the ground it’s growing in.
Common questions
Why is my Bermuda lawn still green in December?
Near the coast, it probably never really went dormant. NOAA’s climate normals show no computable freeze at Los Angeles, so a Bermudagrass lawn there mostly just slows down rather than browning out the way it would inland, where winter cold is real.
Can I keep a cool-season lawn permanently in a Los Angeles yard?
You can, but it fights the climate all summer, needing far more water and shade than a warm-season lawn to get through the dry heat. Most gardeners who want winter green instead overseed a dormant warm-season lawn with ryegrass for the cool months and let it fade out as the base grass takes back over in spring.
Do I still need a pre-emergent if my lawn barely goes dormant?
Yes. Weed seed germinates on its own soil-temperature trigger regardless of what your lawn grass is doing, so the pre-emergent timing described above still matters even on a lawn that stays green most of the year.
How do I know if I’m in a warmer or cooler zone than this calendar assumes?
Elevation and distance from the coast are the two biggest clues, since both push winter lows down and shift the calendar toward a cooler pattern. Checking with your county’s University of California Cooperative Extension office is the more reliable route than guessing from a map.