Lawn care calendar for Kansas: when to fertilize and seed

Timing from K-State bulletins MF2916, MF736, MF2130 and MF658; K-State says no single formula fits every Kansas lawn, so adjust to soil, weather and where you live.

Which grasses grow where in Kansas

K-State bulletins cover three groups. Cool-season lawns are tall fescue and Kentucky bluegrass, which green up early and are mowed taller. Bermudagrass and zoysiagrass are warm-season grasses that thrive in summer heat and mow shorter, and buffalograss is a native prairie grass that needs less mowing, watering and fertilizer than the others.

Buffalograss greens up earlier than bermudagrass but several weeks later than bluegrass or tall fescue and turns brown after the first fall freeze. K-State says it wants full sun, or at least 6 to 8 hours of direct light, and drained loam. It is not suited to sandy, wet or poorly drained sites.

Frost dates from NOAA

Dates are the NOAA 1991-2020 normals for the last spring and first fall 32 F freeze at 50% probability. At Wichita the last spring frost averages April 11 and the first fall frost October 29. At Topeka Forbes Field the dates are April 15 and October 21, at Dodge City April 21 and October 20, and at Goodland May 2 and October 11.

Counting the days gives about 201 frost-free days at Wichita, 189 at Topeka, 182 at Dodge City and 162 at Goodland (our arithmetic). Goodland has about six weeks less than Wichita, which matters for a September seeding: the same date leaves much less time before a freeze in the northwest.

Spring

K-State says to time crabgrass preemergence herbicide before redbud trees reach full bloom, and to core aerate cool-season grass in March or April. Large dead patches in tall fescue can be seeded in March or April, but the bulletin warns that spring seed germinates slowly in cold soil and meets more weed competition, so fall is the better time.

Mow tall fescue frequently enough that no more than a third of its height comes off at once. K-State puts the mowing range at 2 to 3 inches for turf-type fescue, and notes that fertilizing in fall rather than spring reduces spring mowing. Delay any spring feeding until growth slows in May, then use a slow-release nitrogen so the grass does not shoot up before the heat.

Summer

Bermudagrass and zoysiagrass are fed between May and August and aerated from late May through July, with buffalograss fed in June. K-State mowing heights are 1 to 2 inches for bermudagrass and zoysiagrass and 2 to 3 inches for buffalograss; tall fescue goes to the upper end of its range in summer to shade the soil and root deeper. Grubs, where present, are treated in May through July depending on timing.

K-State recommends soaking the soil to a depth of 6 to 8 inches and waiting as long as possible before watering again, since frequent shallow watering makes shallow roots. Buffalograss needs one or two deep soakings in summer. For buffalograss, K-State says that in the wetter east and center overwatering is a bigger concern than underwatering except in prolonged drought, and that in western Kansas weekly watering during severe drought keeps an acceptable color but is not needed for survival.

Fall

September is the main month for cool-season lawns. K-State calls it the best time to plant tall fescue and says the way to avoid weeds is to plant in mid-September, using 6 to 8 pounds of seed per 1,000 square feet, with 1 pound of nitrogen worked into the surface just before seeding. Seedlings get half a rate of nitrogen a month after planting and stay moist until they emerge.

Established fescue and bluegrass are fed in September and November. K-State uses a slow-release nitrogen for spring and early fall and a quick-release one in late fall, and says a November feeding keeps the lawn green longer and helps it green up sooner in spring. Dandelions are controlled best with an herbicide in the fall.

Fertilizer rules and soil tests

The Kansas Department of Agriculture registers fertilizer products and collects tonnage fees under K.S.A. 2-1201 and later sections. The page I read on October 2, 2026 covers registration, tonnage reports and custom blenders, and I found no statewide limit on phosphorus in home lawn fertilizer there.

K-State recommends a soil test through the county extension office, since lawns generally need more nitrogen than phosphorus and potassium. It also says to sweep fertilizer off pavement, avoid applying before heavy rain and use a drop spreader near open water. The lawn fertilizer calculator on this site turns the 1 pound target into pounds of product for any bag; the K-State table shows the same math, for example 43 pounds of a 23 percent product for 10,000 square feet.