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SUNDAY, AUGUST 16, 2026   |   SPECIAL REPORT & ANALYSIS

CROP TOUR PREVIEW  |  2026 CORN & SOYBEANS

UPDATING: Scouts Walk Into a Split Crop — and a Flooded Eastern Belt

The 2026 Pro Farmer Crop Tour rolls Monday into an eastern Corn Belt that has taken a week of record rainfall and a western leg still working through drought — while private scouts report thinner cobs, lighter ear girth and unmistakable denitrification across Illinois and Iowa.

(Note: Pro Farmer releases its Tour estimates Friday afternoon; not Thursday evening in Minnesota.)

Analysis  ·  August 16, 2026

More than 100 crop scouts leave Columbus, Ohio, and Sioux Falls, South Dakota, Monday morning for the 2026 Pro Farmer Crop Tour, and they will be measuring a corn crop that looks very different depending on which side of the Mississippi River they are standing on. The eastern leg drives straight through a flood corridor that has produced record river crests, downed corn and standing water from central Illinois into eastern Ohio. The western leg samples a crop that has been short of moisture for most of the summer. Between those two extremes sits USDA’s Aug. 12 national corn yield of 180.7 bu. per acre — down 2.3 bu. from July and 5.8 bu. below last year’s record — and a corn crop rated just 61% good-to-excellent, 11 points below a year ago. The Tour will not resolve that argument this week. It will, however, produce the first hand-measured evidence of whether the ear counts and kernel rows support the number USDA is carrying.

The central tension of this Tour: the damage that dominated the weekend field reports — drowned root systems, denitrified nitrogen, lodged and leaning corn — expresses itself in kernel depth and test weight over the next two to three weeks, not in the ear counts scouts will collect on Monday and Tuesday.

Where the Tour goes and how it counts

The Pro Farmer Crop Tour samples seven states — Ohio, Indiana, Illinois, Iowa, Minnesota, Nebraska and South Dakota — that together account for roughly 70% of U.S. corn and soybean production. Two legs run Monday through Thursday and converge in Rochester, Minnesota, on Thursday night. Pro Farmer releases its national corn and soybean estimates Friday afternoon. Scouts sample more than 2,000 fields along the way using a procedure that has not changed materially since the 1990s, which is the entire point: the value of the Tour is not the absolute number, it is the comparison to the same measurements taken the same way in prior years.

In corn, scouts lay a 30-foot rope across two rows, count every ear in that plot, then pull the 5th, 8th and 11th ears to measure grain length and count kernel rows around. Ear count times grain length times kernel rows, divided by the measured row width, produces the field’s estimated yield.

In soybeans, scouts measure a 3-foot plot, count plants, then count every pod a quarter-inch or larger on three randomly selected plants and convert to pods in a 3-foot by 3-foot square. Fields are not pre-selected; scouts walk 35 paces off the road before the first sample, which removes the ability to choose the good part of the field.

Figure 1. The 2026 Pro Farmer Crop Tour route, Aug. 17–20. Eastern leg: Columbus, Ohio, to Rochester, Minnesota, by way of Indiana, Illinois and eastern Iowa. Western leg: Sioux Falls, South Dakota, through Nebraska and western Iowa. Source: Pro Farmer / Farm Journal event schedule.

Table 1. Crop Tour overnight stops and the ground each leg covers. Pro Farmer releases state results each evening and its national estimate Thursday night in Rochester. Source: Farm Journal / Pro Farmer.

The setup: a 61% crop, not a 72% crop

Scouts are walking into a materially weaker crop than the one they measured a year ago. As of the week ended Aug. 9, USDA rated the U.S. corn crop 61% good-to-excellent, unchanged on the week but 11 points below the 72% of a year ago, with 14% rated very poor to poor versus 8% in late July. Soybeans were 62% good-to-excellent, down a point on the week and 6 points below last year. The national numbers, though, conceal an unusually wide spread among the seven Tour states — Iowa at 78% good-to-excellent corn against South Dakota at 45%.

Figure 2. Corn condition in the seven Crop Tour states, week ended Aug. 9, 2026. Source: USDA National Agricultural Statistics Service, Crop Progress.

Table 2. Crop condition and development in the Tour states, week ended Aug. 9, 2026. Note Ohio’s soybean rating — 49% good-to-excellent, the weakest of the seven — recorded before the heaviest flooding. Source: USDA NASS Crop Progress, Aug. 10, 2026.

Two details in that table matter for the week ahead. First, corn development is not far enough along to be safe: Illinois was 10% dented, Indiana 14%, Ohio just 7%. A crop that is still filling is a crop whose final kernel weight is genuinely undetermined — which cuts both ways, and is the strongest argument that the Tour’s mechanical count will understate the damage. Second, Ohio soybeans at 49% good-to-excellent were already the weakest in the seven-state group before the water arrived.

USDA’s August benchmark

USDA’s Aug. 12 Crop Production report put national corn yield at 180.7 bu. per acre on 88.6 million harvested acres for a 16.013-billion-bu. crop, and soybeans at 52.7 bu. per acre for 4.519 billion bu. — the largest U.S. soybean crop on record. The corn cut of 2.3 bu. from July came in below the condition-based models: the University of Illinois trend-and-condition model had pointed to 183.0 bu. per acre going into the report, and DTN’s Digital Yield Tour, run Aug. 1, had 178.5 bu. per acre. The market therefore has a roughly 4.5-bushel band of estimates, and the Tour walks into the middle of it.

Figure 3. USDA state corn yields, Aug. 12, 2026, forecast versus 2025 final. Source: USDA NASS, Crop Production (Aug. 12, 2026) and Crop Production 2025 Summary.

Table 3. USDA’s August state yield forecasts against 2025 finals. Iowa, Indiana and Ohio corn are forecast at records; Nebraska and South Dakota carry the drought penalty. Source: USDA NASS, Crop Production, Aug. 12, 2026.

Read Table 3 next to the flood map and the problem is obvious: USDA’s August survey is anchored to Aug. 1 conditions and carries record corn yields in Indiana and Ohio, and a record soybean yield in Ohio — the three states that took the worst of the rain in the ten days after that survey closed.

A second, fully independent read points the same way. DTN’s Digital Yield Tour, a machine-learning model run against satellite and weather data rather than farmer surveys, published state estimates from an Aug. 1 snapshot — before the flooding. It landed below USDA in six of the seven Tour states, including every state on the eastern leg: Indiana 3.8 bu. lower, Ohio 3.1 lower, Iowa 2.0 lower and Illinois 1.7 lower. It was above USDA only in Minnesota and South Dakota. That matters because DTN’s Aug. 1 model and the private field scouts working Illinois and Iowa reached the same conclusion by completely different methods, and both did so before the water arrived.

Figure 4. DTN’s Aug. 1 Digital Yield Tour model against USDA’s Aug. 12 survey-based corn yields. Two independent methods, one direction. Source: DTN/Progressive Farmer Digital Yield Tour, Aug. 10, 2026; USDA NASS.

Table 4. USDA’s August survey against DTN’s Aug. 1 model, bushels per acre. The gap is DTN minus USDA. Sources: USDA NASS, Crop Production (Aug. 12, 2026); DTN/Progressive Farmer Digital Yield Tour (Aug. 10, 2026).

The flood corridor the eastern leg drives through

Field reports over the weekend were dominated by water. A stalled frontal boundary parked repeated rounds of thunderstorms over the same ground for the better part of a week, producing widespread 3.00 to 5.00-inch totals across portions of Iowa, Illinois, Indiana and Ohio — and considerably more in the hardest-hit band. Parts of eastern Indiana and southeastern Ohio picked up more than 11 inches over the week. Washington Municipal Airport in southeast Iowa recorded close to 10 inches. Glouster, Ohio, took nearly 8. The White River at Anderson, Indiana, crested at a record 24.9 feet, topping a mark that had stood since 1913. Indiana Gov. Mike Braun declared a statewide disaster emergency, deployed the National Guard and requested a presidential emergency declaration.

The agronomic damage is the part that matters here. The rain fell on soils that were already saturated, so almost all of it ran off or ponded. Corn and soybeans are standing in water across a corridor running from central Illinois through central Indiana into eastern Ohio, with lodged and downed corn reported through the same band after gusty outflow winds accompanied the heaviest storms. Ponded corn at dough-to-early-dent loses root function first and kernel fill second; beans setting pods in saturated ground abort the youngest pods.

Figure 5. The heavy-rain and flood corridor ahead of the Tour, Aug. 9–16, 2026, with Crop Tour route cities overlaid. Shading is an approximation of reported rainfall and flood-impact areas, not a gridded analysis. Sources: NWS/WPC, USDA Agricultural Weather Highlights and regional field reports.

The eastern leg’s Monday and Tuesday routes run through the middle of that corridor. Noblesville, Indiana, sits inside the record-crest watershed. Riverside, Iowa, sits inside the southeast Iowa heavy band. Bloomington, Illinois, anchors the central Illinois zone where the 3.00 to 5.00-inch totals landed on saturated ground.

Denitrification and the cob-count problem

Separate from the flooding, several private scouting operations working Illinois and Iowa ahead of the Tour have reported disappointing corn yield potential relative to recent years, with two specific and consistent observations: lower cob numbers, and ears that lack girth. Both are consequences of the same underlying problem — nitrogen that is no longer in the root zone.

Denitrification is the microbial conversion of nitrate to nitrogen gas under saturated, oxygen-depleted soil conditions, and it accelerates sharply in warm soils. Rough agronomic rules of thumb put losses near 4% to 5% of available nitrate per day of saturation at 65°F to 75°F soil temperatures. Two to five days of standing water in a warm August is enough to move a field from adequate to short. The visual signature is exactly what scouts have been describing: firing up the plant from the bottom leaves, pale upper canopy, and ears that set a normal number of kernel rows around but fail to fill the tip and never put on girth.

This is where the Tour’s arithmetic gets interesting. Of the three variables scouts measure, two — ear count and kernel rows around — were locked in weeks ago. Ear count was determined at stand establishment. Kernel rows around were set around V12 to V15. Neither can be reduced by an August flood. The third variable, grain length, is measured as inches of kernels on the cob, and it too is largely set by the point of pollination. What is not measured at all is kernel depth and test weight — and that is precisely where late-season nitrogen shortage and drowned roots do their damage.

Figure 6. Tour ear counts by state — the 2025 result against the 2022–24 three-year average. Scouts and analysts read this Monday through Thursday as the primary signal. Source: Pro Farmer state Crop Tour results.

Table 5. The benchmark. Corn yields in bu. per acre; ear counts are ears per 60 feet of row; pod counts are pods in a 3-foot by 3-foot square. Three-year averages are the 2022–24 figures Pro Farmer published alongside the 2025 results. Source: Pro Farmer state Crop Tour results, 2025.

Table 5 is the yardstick to hold up against every number that comes out of the route Monday through Thursday. If ear counts in Illinois come in near 106 and Indiana near 103, the stand is intact and the Tour number will look respectable regardless of what the fields look like from the road. Watch grain length instead — Illinois averaged 6.94 inches in 2025 against a 6.81-inch three-year average, Iowa 7.09 against 6.72. A half-inch shortfall in grain length is worth roughly 12 to 15 bu. per acre in the Tour’s formula, and it is the one measured variable that can still register denitrification and poor tip fill.

A farmer asks: Will scouts apply a discount factor for the flood damage?

This is the right question to ask this week, and the honest answer has two parts: no in the state numbers, and partly yes in the Thursday-night national estimate.

The state results Pro Farmer publishes each evening are mechanical. They are the arithmetic average of what scouts physically counted in the fields they stopped at — ear count times grain length times kernel rows over row width. There is no judgment layer, no haircut for stress, and no adjustment for what a field is likely to look like in three weeks. If a flooded field still has ears on the stalk when a scout walks it on Tuesday, those ears get counted at full value. The damage that a farmer can see coming — shallow kernels, light test weight, stalk rot, ear droppage, premature death — accrues after the sample is taken and is invisible to the measurement.

There is one real exception, and it cuts the other way. Pro Farmer’s stated procedure is that if a field is planted and harvestable when scouts arrive, it gets measured; and if the sampling procedure lands scouts in a drowned-out area with no harvestable ears, that field is recorded as a zero. Prevent-plant and total losses are handled as an acreage adjustment rather than being counted twice. So genuinely destroyed ground does register — but only in the narrow case where the random 35-pace walk happens to put a scout in it. Fields that are impassable get skipped in favor of the next one down the road, which is a quiet upward bias in a flood year.

The judgment enters on Thursday night. Pro Farmer is explicit that its final number is a Pro Farmer estimate, not a Tour estimate, and that it incorporates crop maturity, acreage adjustments, areas outside the Tour’s routes, the historical Tour-versus-USDA relationship and other factors — and it is issued as a range, not a point. That is where a flood discount can legitimately be applied, and given how late this crop is and how visible the damage will be along the eastern route, it would be surprising if the commentary did not lean that direction even if the raw state averages hold up.

Table 6. Why the Tour’s raw numbers lag visible flood damage. Two of the three corn variables scouts measure were locked in before the rain fell; the two variables where flood and denitrification damage actually shows up are not measured. Source: Pro Farmer Crop Tour methodology.

So the farmer’s instinct is correct: the damage will show up in a week or three, not in Tuesday’s ear counts. Expect the raw state corn numbers along the eastern route to read better than the fields look — and expect the gap between the photographs and the spreadsheet to become the story of the week.

The state the Tour will not see

There is a mirror image of the flood problem sitting just north of the western leg, and it is worth naming because it pulls the national number the same direction for an entirely different reason. North Dakota is not on the Crop Tour route. It is also in the middle of a flash drought that developed almost entirely within the month of July.

State climatologist Daryl Ritchison has called July one of the warmest and driest on record in North Dakota, with multiple days above 100 degrees. The share of the state in extreme drought jumped from under 9% to more than 23% in a single week, with over half the state in drought of some category. The crop numbers follow: as of Aug. 9, North Dakota corn was rated just 27% good-to-excellent with 40% very poor to poor, topsoil moisture was 70% short to very short, and the corn crop was 3% dented — a very late crop in a very dry August. Farm Journal’s field reporting from the state describes producers chopping corn for silage early rather than carrying it to grain, with pockets of outright crop failure and soybean pod abortion. NDSU Extension has issued nitrate-poisoning warnings on drought-stressed forage, which is the agronomic tell that the salvage decision is already being made across a lot of acres.

Figure 7. North Dakota against the two Tour states on the western leg, week ended Aug. 9, 2026. North Dakota is worse on every measure and is not sampled. Source: USDA NASS Crop Progress, Aug. 10, 2026.

Put the two together and the symmetry is the point. In the east, the Tour cannot see the flood damage because of timing — the sample is taken before the loss expresses itself. In the north, the Tour cannot see the drought damage because of geography — the route does not go there. Both are real, both are negative, and neither will appear in the ear counts published Monday through Thursday. The one place they can appear is the Friday afternoon national estimate, which by Pro Farmer’s own description accounts for areas outside the Tour.

Soybeans: pod counts on a crop USDA already calls a record

The soybean side carries a different risk profile. USDA has the national crop at a record 4.519 billion bu. on a 52.7-bu. yield, with record yields forecast in Illinois, Indiana and Ohio. Pod counts on the Tour will very likely support that, because pods that exist get counted — Illinois set a Tour record 1,479 pods in a 3-by-3 square in 2025, and the 2026 crop entered August with 74% of Illinois beans setting pods.

But August soybean yield is a seed-size and seed-fill story, and the crop is at the stage where it is most sensitive. Beans standing in water at R4 to R5 abort the youngest pods within days, and saturated soils in the eastern belt into late August raise the risk of Phytophthora and sudden death syndrome expression on ground that has been wet for a week. Ohio at 49% good-to-excellent before the flooding is the number to watch, and Ohio is where USDA is carrying a record 58-bu. yield.

Tour-week weather: a cooperative week for scouting

The near-term pattern is the one that produced the flooding, and it is not finished. A slow-moving frontal system is driving heavy rain and strong storms from the Midwest into the central Appalachians. The Weather Prediction Center carries a Moderate Risk (level 3 of 4) of excessive rainfall over West Virginia with repeated rounds of storms capable of 1 to 2 inch-per-hour rates, and a separate Slight Risk from southern Wisconsin through the Chicago metro into Michigan, where 2 to 4 inches is possible where storm clusters train. The Storm Prediction Center carries a Slight Risk across the central High Plains, where an overnight cluster from western Nebraska into northern Kansas poses severe wind and isolated large-hail threats and may reach far northwest Missouri.

Figure 8. NWS/WPC national forecast, valid 8 a.m. EDT Sunday, Aug. 16, through 8 a.m. EDT Monday, Aug. 17, 2026 — the frontal boundary and excessive-rainfall risk areas the eastern leg starts under. Source: NOAA/NWS/NCEP Weather Prediction Center.

For the Tour itself, the week sets up better than the weekend. Scouting conditions are broadly favorable, with temperatures running roughly 5 to 10 degrees below normal across the sampling area, and USDA’s 6-to-10-day outlook for Aug. 19–23 calls for near- to above-normal precipitation with near-normal temperatures across the northern tier. Cool and mostly dry is close to ideal for walking fields — and it is also exactly the condition under which a stressed crop photographs better than it is.

Table 7. Tour-week weather outlook by leg. Source: NOAA/NWS Weather Prediction Center, Storm Prediction Center and USDA Agricultural Weather Highlights.

What the Tour has historically been worth

The Tour’s track record argues for treating Thursday’s number as a directional signal rather than a forecast. Over the last four years Pro Farmer’s August corn estimate has missed USDA’s final by an average of 4.05 bu. per acre, and it has been low in three of those four years — by 5.3 bu. in 2022, 5.3 bu. in 2023 and 3.8 bu. in 2025, and high by 1.8 bu. in 2024. The soybean record is considerably better, averaging a 1.8-bu. absolute miss with a dead-on 53.0 in 2025.

Figure 9. Pro Farmer’s August corn estimate against USDA’s final yield, 2022–2025. Sources: Pro Farmer national estimates; USDA NASS Crop Production Annual Summaries.

Table 8. Pro Farmer’s August estimate versus USDA’s final, all figures in bushels per acre. Sources: Pro Farmer; USDA NASS Crop Production Annual Summaries.

The structural reason for the low bias in corn is the same reason the Tour will probably not capture this year’s flood damage: the Tour measures a crop that is still filling, and in most years the crop finishes better than the mid-August sample implies. In a year where the eastern belt has been under water in the week before sampling, that historical bias may finally break the other way — which is a genuinely unusual setup and worth watching closely.

What to watch, day by day

Table 9. The daily release schedule and what each number tests. Source: Pro Farmer Crop Tour schedule.

Bottom line

Expect the raw Crop Tour numbers to look better than the fields do, particularly along the eastern route. Two of the three corn variables scouts measure — ear count and kernel rows — were determined months before the water arrived, and the variables where flood damage and denitrification actually express themselves, kernel depth and test weight, are not measured at all. There is no discount factor in the nightly state averages.

Watch grain length, not ear count. It is the only measured variable that can register poor tip fill and nitrogen shortage, and a shortfall of a half inch against the three-year averages in Table 5 is worth roughly 12 to 15 bu. per acre in the Tour’s own arithmetic. Illinois at 6.94 inches and Iowa at 7.09 in 2025 are the marks to beat.

The flood discount, if it comes, arrives Friday afternoon in Pro Farmer’s national estimate — which is explicitly an editorial judgment incorporating maturity, acreage and areas off the route, and which is published as a range. Given a crop rated 61% good-to-excellent against 72% a year ago, corn only 7% to 14% dented across the eastern states, and a week of record rainfall on already-saturated ground, the risk to USDA’s 180.7-bu. national yield is asymmetric to the downside — but that risk shows up in the September and October reports, not in this week’s ear counts.

For soybeans, the Tour will most likely confirm USDA’s record. Pods that exist get counted, and the eastern belt entered August with pod set running near or ahead of normal. The vulnerability is the same one as in corn — seed size and late-season disease pressure on saturated ground — and Ohio, carrying a record 58-bu. USDA yield on a crop that was only 49% good-to-excellent before the flooding, is the single number most exposed to a downward revision this fall.

AG POLICY & MARKETS DAILY   |   CROP TOUR PREVIEW  |  2026 MIDWEST CORN & SOYBEANS — SUNDAY, AUGUST 16, 2026