A late Iowa corn harvest dries on propane whose price follows the Gulf hub

Why these series belong together

Three open series follow the chain from field to fuel bill: weekly Iowa corn harvested (USDA NASS), Midwest (PADD 2) propane stocks (EIA) and the Midwest residential propane price (EIA), with Iowa rainfall (NOAA) and US propane exports (EIA) beside them. No public series measures delivered moisture or drying gallons.

What the weather and the harvest did

Iowa had 7.83 inches of rain in September [F10], its fourth-wettest since 1895, against 1.82 a year earlier [F11] and 6.21 in 2019 [F12]. On 1 November Iowa had harvested 66 percent of its corn [F1] against a 2021-2025 average of 79 [F2], up from 47 a week earlier [F7]; Nebraska stood at 66 against 75 [F3] [F4]; 2019 was later, at 43 [F8]. Every weekly October report of the Iowa Department of Agriculture was warmer than normal, and the crop matured on time.

What stocks and exports did

Midwest propane stocks were 17,697 thousand barrels on 30 October [F13], against 20,761 a year earlier [F14] and 22,034 in 2024 [F15]. They peaked at 19,405 on 21 August [F16] and fell to 17,963 by 25 September [F17], with Iowa 5 percent harvested [F48], while both earlier autumns built [F44] [F45]. From 21 August to 30 October the US drew 7,411 thousand barrels and the Gulf Coast 6,614 (EIA): the Midwest carried 23 percent of the national draw. US exports were 1,869 thousand barrels a day in the week to 30 October [F25], below the same week of 2025 and 2024 [F26] [F27]: the record is the year's pace, not the latest week [F28].

What the price did

The Midwest residential price went from 2.055 dollars a gallon in the survey of 5 October [F32] to 2.298 on 2 November [F30], a rise of 0.243 over four weekly surveys, against 0.011 to 0.064 over the same four weeks of 2021-2025. It is 0.358 above a year earlier [F31] and below the same week of 2021 [F34]. The US average rose 0.375 on the year, slightly more; Iowa's price was 1.859. The Mont Belvieu hub price, a licensed series read at its source, rose first.

The mechanism, and what else could explain it

Hypothesis · Corn standing into November dries about one point a week in the field instead of two and a half in October, so more reaches the dryer wet. If the third of Iowa's crop still standing on 1 November came in at the 20 percent moisture elevators reported in 2019, drying it to 15 percent would take about 2.04 million barrels, 11.5 percent of Midwest stocks [F13]: the propane is in storage; the limit would be delivery.

Hypothesis · Other readings compete. The warm October may have dried the corn in the field, making 20 percent an upper case. The Midwest draw began before the harvest inside a larger Gulf-led draw, so exports and the northbound flow explain it better than dryers; that reading holds on its first claim only, since no series measures the flow. The price rise so far is national, carried by the hub, with no Midwest premium. Elevators on gas mains dry without propane.

Who sits on this chain

NEW Cooperative runs a propane-fired tower dryer at Blencoe, Iowa; Landus added drying and wet holding at Jefferson. Ferrellgas, AmeriGas, Suburban Propane and MFA Oil sell drying propane. ONEOK and Enterprise moved propane north in the 2019 drying season; Enterprise, Energy Transfer and Targa run Gulf export docks, where Indian Oil and HPCL lift under 2026 contracts. PERC made the hook's statement; Iowa State Extension documented the 2019 backlog.

Hypothesis · Deduced: Heartland Co-op, Key Cooperative and Aurora Cooperative dry grain and deliver propane in the same weeks; CHS and GROWMARK supply them; MidAmerican Energy serves elevators that can dry on gas.

A conditional sensitivity for an elevator, not a forecast

Scenario · Assume corn delivered at 20 percent and dried to 15 at Iowa State's average of 0.018 gallons a bushel per point. A 6,000-bushel-an-hour tower dryer like NEW Cooperative's at Blencoe then burns about 540 gallons an hour, close to 13,000 a day, more than one transport load. At Iowa's survey price of 1.859 dollars a gallon the fuel per point is about 3.3 cents a bushel, inside the 4.8-cent per-point charge Iowa State illustrates; each further 10 cents a gallon adds about 0.18 cents. On that arithmetic deliveries, not price, limit a late run first, as in November 2019, when Iowa suspended drivers' hours for propane haulers.

What would change this reading

Hypothesis · Midwest stocks for the week ending 20 November set the branch. Above 16,000 thousand barrels, a draw at or below 2024's pace, November surveys should stay between 2.25 and 2.42 dollars a gallon. At or below 16,000, which needs weekly draws beyond any November week in the series [F23] [F24], December surveys should run between 2.35 and the window's high of 2.623 [F38]. A Midwest year-on-year rise 10 cents or more above the US average's, or an Iowa propane hours-of-service suspension by 30 November, would show a regional constraint not yet in the series.