A growing season already marked by extreme differences in weather could become even more complicated as harvest gets underway.

According to Nutrien Ag Solutions Senior Atmospheric Scientist Eric Snodgrass, a strengthening El Niño may contribute to wetter fall conditions across much of North America and reduce the number of favorable days available for harvest and fall fieldwork.

Across the I-states, producers typically have about 40 workable days between the beginning of harvest and the completion of fall fieldwork. In an El Niño year, Snodgrass says that window could shrink by roughly 20%, falling to approximately 32 days.

A Growing Season of Extremes

The possibility of a tighter harvest window follows a season of sharply different conditions across major agricultural regions.

Parts of the Eastern Corn Belt experienced exceptionally heavy rainfall during August, with widespread areas receiving more than a foot of rain. Some areas of Illinois, Indiana, and eastern Iowa had already recorded similarly significant rainfall earlier in the growing season.

Those conditions are beginning to show in the field. Scouts participating in the Pro Farmer Crop Tour observed crown rot, weakened stands, and signs of nitrogen loss in fields affected by repeated heavy rainfall.

Meanwhile, producers farther south have faced a very different set of challenges. Portions of Oklahoma, Texas, Kansas, and the lower Mississippi River Valley have experienced prolonged dry conditions and extreme heat, with temperatures reaching 105 to 110 degrees in some areas.

As a result, agricultural operations may enter harvest dealing with very different crop conditions depending on location.

Fewer Workable Days Could Add Pressure to Harvest

Looking ahead to September, October, and November, weather models referenced by Snodgrass point toward a wetter-than-average finish for much of North America.

That does not mean every location will experience the same conditions, but wetter weather could reduce the number of days when fields are suitable for harvest and other fall work.

For operations managing significant acreage, losing approximately eight workable days can create additional logistical pressure. When conditions are favorable, there may be less flexibility to delay harvest or fieldwork.

Snodgrass emphasized that El Niño does not determine an exact outcome. Instead, it shifts the odds toward certain weather patterns.

Why This Matters for Agricultural Claims Professionals

For agricultural claims professionals, conditions leading into and during harvest can provide important context when losses are later reported and investigated.

This season has already included excessive rainfall, drought, extreme heat, weakened crop stands, crown rot, and nutrient-loss concerns in different parts of the country. A shorter harvest window could add another layer of complexity as producers work to get crops out of the field.

When multiple weather and crop-health factors are involved, developing a clear timeline of conditions can become especially important during the claims process.

Field observations, photographs, weather information, harvest timing, crop condition, and other supporting documentation can help provide a more complete picture of the circumstances surrounding a reported loss.

For agricultural insurance and claims professionals, staying aware of regional crop conditions and changing harvest circumstances can provide valuable context as claims begin to develop throughout the fall.

With harvest beginning across much of the country, the potential for fewer workable days is another development worth following closely.

Source: AgWeb, “A Wet East, A Baked South, and a Shrinking Harvest Window: What El Niño Means for Farmers This Fall,” September 3, 2026.