Lawn care calendar for New Mexico: when to seed, mow and water

Seeding dates are from NMSU Guide H-509. Green-up and dormancy dates are NMSU observations at Farmington (cool-season grass green mid-March to mid-November, warm-season grass mid-May to mid-October); other places vary with elevation.

Which grasses grow where in New Mexico

NMSU says cool-season grasses (perennial ryegrass, Kentucky bluegrass, fine fescues, creeping bentgrass, tall fescue) generally suit anywhere north of Socorro, including the Cloudcroft, Ruidoso and Silver City areas, while warm-season grasses (bermudagrass, buffalograss, blue grama, St. Augustinegrass, zoysiagrass) are more adapted to the south. It calls that rule an oversimplification: with regular irrigation, cool-season grass can grow almost anywhere in the state.

Bermudagrass is the species most used at the lower elevations of southern New Mexico, buffalograss is more drought tolerant and can live on similar water, and NMSU calls tall fescue a good general-purpose turfgrass because of its heat and drought tolerance. Improved bluegrass and ryegrass varieties are now heat tolerant enough for most of the state, while warm-season grasses go dormant and brown for at least five months a year.

Frost dates from NOAA

Dates are the NOAA 1991-2020 normals for the last spring and first fall 32 F freeze at 50% probability. Roswell Industrial Air Park averages March 29 and November 7, Albuquerque International Airport April 6 and November 3, and Santa Fe County Municipal Airport May 4 and October 15. NMSU gives the freeze-free period at its Farmington research center as 162 days, May 4 to October 13.

Counting the days between the NOAA dates gives about 223 frost-free days at Roswell, 211 at Albuquerque and 164 at Santa Fe (our arithmetic). Santa Fe sits higher and has about eight weeks less than Roswell, so a September seeding there has a short runway before the first freeze.

Spring

NMSU says cool-season grass greens up in late February to early March in the northwest and has a full canopy between mid-March and mid-November, when the average daily temperature stays above 40 F. It grows fastest in spring and fall and slowly if at all in summer. Warm-season grass at the same site is green only from mid-May to mid-October.

Mowing heights from NMSU Guide H-505 for residential lawns are tall fescue 2 to 3.5 inches, Kentucky bluegrass and perennial ryegrass 1 to 3, bermudagrass 0.5 to 1.5, zoysiagrass 0.5 to 2 and buffalograss 1.5 to 4. Follow the one-third rule: a lawn kept at 2 inches should be cut when it reaches 3.

NMSU’s lawn guides give no calendar of fertilizer dates. Its disease guide says to feed at the proper rate and time based on a soil test and warns that high nitrogen applications can invite some diseases. Since cool-season grass grows fastest in spring and fall, those are the seasons a feeding is used most quickly (our reading, not an NMSU date).

Summer

NMSU’s irrigation guide estimates cool-season turf at about 0.25 inch of water a day in Albuquerque in summer, and its turfgrass irrigation circular lists summer evapotranspiration of 2.0 to 3.5 inches a week for tall fescue against 1.0 to 2.2 for bermudagrass and 1.5 to 2.0 for buffalograss. Those figures are the water the grass uses, so the amount you apply must cover the shortfall left by rain.

The guide has you wet the root zone and wait until the soil has used part of its stored water. For a sandy loam with an 18-inch root zone, its worked example allows about 1.05 inches to be lost before irrigating. Sandy soils need more frequent watering, and fine-textured soils may need several short runs to let the water soak in. An irrigation audit with catch cans shows how evenly your sprinklers apply it.

Fall

Late summer is a good time to seed cool-season grass in northern New Mexico, according to NMSU, because of lower wind, fewer temperature swings, a better chance of rain and less competition from annual weeds. The window there is August 15 to September 15, and in the south September 1 to October 15; Kentucky bluegrass is not recommended for seed in southern New Mexico.

Seeding rates per 1,000 square feet are 7 to 9 pounds for tall fescue and perennial ryegrass, 3 to 4 for fine fescue and 1 to 2 for Kentucky bluegrass. Warm-season seed goes down in the warm months at 1 to 1.5 pounds for hulled bermudagrass and 3 to 3.5 pounds of burrs for buffalograss. NMSU adds that warm-season grasses can be seeded as early as late April, so there is no need to wait until May or June.

Fertilizer rules and soil tests

The New Mexico Department of Agriculture regulates the labeling and distribution of commercial fertilizer under the New Mexico Fertilizer Act. The page I read on October 2, 2026 covers registration, tonnage reporting and enforcement, and I found no state limit on phosphorus in home lawn fertilizer.

NMSU recommends a soil test before planting and feeding. The lawn fertilizer calculator on this site turns your target nitrogen rate into pounds of product for the bag you buy, which is the step NMSU leaves to you.