Crop Weather Watch: Corn and Soybeans in Iowa, Southern Minnesota, Mato Grosso
Iowa soybeans only 5% harvested versus 38% average; more heavy rain possible next week.
A dry, warm week should let US harvest start catching up, but both US states are far behind on soybeans and CPC leans wetter again Oct 11–15; Mato Grosso soybean planting is slow on patchy rain. Southern Minnesota is covered with Minnesota statewide data, as county-level figures were not retrieved; Mato Grosso corn is out of season.
The 30-second version
Iowa soybeans: 5% harvested vs 38% average after a historically wet September; CPC favors above-normal precipitation Oct 11–15.
Minnesota soybeans 25% harvested vs 51% average; corn 12% vs 16%. Fields need drying time.
Mato Grosso soybeans 10.23% planted, 4.79 points behind last year; rain is patchy and heat is building.
01Iowa, soybeans · Oct 5
Iowa soybeans: High risk as harvest lags 33 points
Stage: 81% of Iowa soybeans were dropping leaves and 5% harvested versus a 38% five-year average; condition was 70% good/excellent, down 4 points (USDA NASS via Iowa Capital Dispatch, week ending Oct 4). Observed, Sep 28–Oct 4: statewide precipitation just under 2 inches, about 1.2 inches above normal, with 6.49 inches at Portsmouth (Shelby County); temperature 61.8°F, 4°F above normal; 1.2 days suitable for fieldwork; 45% of topsoil and 34% of subsoil in surplus moisture. Iowa State Extension flagged mold and fungus concern in wet grain.
Forecast: CPC (issued Oct 5) favors above-normal temperature and above-normal precipitation for Iowa for Oct 11–15 (6–10 day), then near-normal for both Oct 13–19 (8–14 day); CPC rates confidence 2 of 5 for both. The US Drought Monitor (Oct 1 summary) shows very little drought from Iowa to Ohio. Excess moisture is the risk, not drought. No frost signal appears in CPC's Iowa table. No quantified yield estimate is available from the sources reviewed; the risk is harvest delay and grain quality. A DTN meteorologist (private forecast, Oct 5) flagged possible heavy rain and colder air next week.
For farm operators: with unhedged soybeans, prioritize fields that dry first this week, check for pod and seed quality problems, and line up storage before the next wet spell.
Iowa corn: Moderate risk; 85% mature, only 7% harvested
Stage: 85% of Iowa corn was mature, but only 7% harvested, 13 points behind the five-year average. Condition was 72% good/excellent, down 3 points (USDA NASS via Iowa Capital Dispatch, week ending Oct 4). Wet-week observations are in the soybean story above; nationally corn was 23% harvested vs 27% average and 54% good/excellent (NASS, Oct 4).
Forecast: CPC (issued Oct 5) favors above-normal temperature and precipitation for Iowa Oct 11–15, near-normal Oct 13–19. Mature corn standing in wet fields faces ear and stalk quality risk; Iowa State Extension notes mold concern. No quantified yield estimate is available. Rating would fall to Low with a sustained dry week and rise to High if rain returns the week of Oct 12.
For farm operators: start corn on drier ground once soybeans are done, and plan drying capacity since field moisture and mold risk rise the longer it stands.
Southern Minnesota soybeans: High risk, harvest half of normal
Statewide Minnesota figures (USDA NASS via Brownfield, Oct 4): soybeans 25% harvested vs 51% average; corn 12% vs 16%; conditions described as cool and wet. Southern-county data and Minnesota condition ratings for corn and soybeans were not retrieved. The US Drought Monitor (Oct 1) reports northwest Minnesota fully out of drought after up to 5 inches of rain near the North Dakota border; it does not describe the south as in drought.
Forecast: CPC (issued Oct 5) favors above-normal temperature and precipitation for Minnesota Oct 11–15, then near-normal for both Oct 13–19, confidence 2 of 5. Soybeans: High (large harvest gap, wetter lean). Corn: Moderate (smaller gap). No quantified yield estimate is available. Frost was not addressed in the sources retrieved.
For farm operators: with soybeans furthest behind, run beans first on any field that carries equipment, and weigh drying and storage costs against waiting on corn.
Mato Grosso soybeans: Moderate risk as planting trails last year
Stage: planting. Imea reports 10.23% of the 2026/27 soybean area sown, up 6.36 points on the week but 4.79 points behind the same point last season, due mainly to low rainfall (CenárioMT, Oct 5, citing Imea). The West region leads at 18.42%. Imea says rhythm should accelerate if rains regularize.
Outlook: Inmet's Sep 22 alert (the latest Inmet product retrieved; it is stale by two weeks) warned that isolated showers may not secure germination, with highs above 30°C in the north and southwest. A yellow storm alert for the state ran to the end of Oct 5 (up to 50 mm/day, hail), and a CenárioMT report puts Cuiabá highs up to 39°C by Oct 9 with isolated rain. No probability outlook or CONAB update was retrieved. Poor stand establishment and replanting are the stage risk; no quantified yield estimate is available. Corn: not assessed, as Mato Grosso's main corn is planted as a second crop after soybeans, so slow soy planting shifts that window later.
For farm operators: Mato Grosso's pace matters for your unhedged soybeans only as a supply signal; a late crop is a consideration, not a trade instruction.