By Olivia Hart

Delaying winter wheat planting from October 1 to November 1 cut yields by 23% across seven years of trials at Garden City, Kan., according to Kansas State University extension data. The 1985–1991 study by Merle Witt also pushed heading back six days, shortened grain fill by 1.7 days for every month of delay, and ran grain fill about 1.5°F hotter per month of delay.

Those figures anchor a new K-State Wheat and Forages extension bulletin for growers in northwest, north-central, southeast and south-central Kansas who are running behind on fall drilling. Romulo Lollato, John Holman, Lucas Haag, Logan Simon and Jeanne Falk Jones wrote the guidance; High Plains Journal published it October 13, 2026.

Where does the planting window stand now?

Early October sits just outside the optimal range for northwest Kansas and approaches the tail of it in north-central Kansas. Late October through early November planting stays in the window only in southeast and far south-central Kansas. Elsewhere, late-October sowing has passed the cutoff for full crop insurance coverage, the authors note — a margin item that deserves as much attention as agronomic yield potential.

Late-planted wheat enters winter with less fall tillering, fewer leaves, and weaker cold tolerance. Wheat needs four to five leaves and one to two tillers before dormancy for maximum winter survival, the bulletin states, and delayed sowing systematically short-circuits that buildup.

Can more seed offset late planting?

Increasing seeding rate is "likely the most important management adjustment," the specialists write. Late-planted wheat produces fewer fall tillers, and fall tillers contribute more to yield than spring tillers. Recommended rates rise with each week past optimal:

• Western Kansas: 150,000–225,000 seeds per acre (10–15 lb/acre)
• Eastern Kansas: 225,000–300,000 seeds per acre (15–20 lb/acre)

Trial conclusions cited in the bulletin show seeding rate had no effect on yield at the earliest planting date (Sept. 26), but did move yield at Oct. 10 and at later dates. Even the highest rates "did not fully compensate" for late planting. Excess seed brings lodging risk and higher early-season water use — the "haying off" pattern seen in 2023–24.

Takeaway: more seed narrows the gap, but it does not close it.

Which other adjustments matter?

• Planting depth. Target 1–1.5 inches uniformly. Shallow seed raises winter-injury risk; deep seed slows emergence in cool soils.
• Starter phosphorus. Apply 20–30 lb/acre of actual P as 11-52-0 or 18-46-0 in-furrow, regardless of soil P level. Cold soils limit P availability, and in-furrow placement helps seedlings access it quickly. The bulletin flags late-planted wheat, wheat for grazing, acidic soils, and low-P fields as the priority cases.
• Fungicide seed treatment and certified seed. Cold, wet soils extend emergence time and raise disease pressure. K-State's MF2955 chart lists options, but treatments do not replace good seed-to-soil contact or reasonable moisture.
• Variety selection. High-tillering, early-maturing varieties tend to outperform low-tillering, later types when sown late. Lollato's team notes that late sowing can delay spring development, exposing grain fill to heat. K-State variety trials in central and eastern Kansas often include a late-planted site after soybean harvest and can guide selection for next year.

What does the bulletin leave out?

The guidance covers agronomic recovery, not cost. It does not price starter P, certified seed, or fungicide treatments, and it does not model the margin trade-off between yield loss and the input bill for higher seeding rates. It also avoids weighing prevented-planting or cover-crop alternatives against marginal late wheat — questions many growers will take to their crop insurance agents before drilling.

Takeaway: the agronomic case is documented; the economic case is left to the grower.

Growers in western Kansas watching the calendar will likely drill through the rest of October; those farther east with soybean acres still in the field face the steeper side of the trade-off.