# CBOT grains, soybeans fall as oil drops on Iran hopes | Stock Market News

> CBOT grain and soybean futures fell sharply on August 4 as oil prices dropped on hopes of a diplomatic resolution to the Iran war that could ease Strait of Hormuz flows. Wheat also tracked Black Sea export risks, while corn and soybeans followed US crop conditions after a hot, dry spell. Forecasts called for August Midwest rain.

- Date: 2026-08-04 · published 2026-08-04T12:00:00.000Z
- Category: geopolitics · region US · magnitude medium
- Page: https://feedsoft.ai/events/12807-cbot-grains-soybeans-fall-as-oil-drops-on-iran-hopes-stock-market-news
- Commodities: [Corn](https://feedsoft.ai/c/CORN.md), [Soybeans](https://feedsoft.ai/c/SOY.md), [Wheat (SRW)](https://feedsoft.ai/c/WHEAT.md), [Crude Oil (WTI)](https://feedsoft.ai/c/WTI.md)

## Why it matters

Lower crude oil reduces biofuel-linked demand support for grains and soyoil, and the rain forecast removes weather risk premium, both pushing grain futures lower.

## Read by commodity

- SOY: bearish ▼
- WTI: bearish ▼
- CORN: bearish ▼
- WHEAT: bearish ▼

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| CORN | 2026-07-27 | [Soybeans and corn fall more than 2% as oil drops, wheat also down \| ZAWYA](https://feedsoft.ai/events/8284-soybeans-and-corn-fall-more-than-2-as-oil-drops-wheat-also-down-zawya.md) | -4.8% | +0.5% |
| CORN | 2026-07-27 | [Corn and Soybeans Fall on US Weather, Pause in US-Iran Strikes - Bloomberg](https://feedsoft.ai/events/8278-corn-and-soybeans-fall-on-us-weather-pause-in-us-iran-strikes-bloomberg.md) | -4.8% | +0.5% |
| CORN | 2018-06-29 | [Futures File: Oil market on fire; grain prices rally – Greeley Tribune](https://feedsoft.ai/events/11640-futures-file-oil-market-on-fire-grain-prices-rally-greeley-tribune.md) | +2.3% | -0.9% |
| CORN | 2026-04-01 | [Grain, Oilseed Prices Fall as Traders Look for End to Iran War - Bloomberg](https://feedsoft.ai/events/19762-grain-oilseed-prices-fall-as-traders-look-for-end-to-iran-war-bloomberg.md) | -1.7% | +1.5% |
| CORN | 2026-04-17 | [Oil prices: Oil tumbles more than 10% as Iran declares Strait of Hormuz open](https://feedsoft.ai/events/8808-oil-prices-oil-tumbles-more-than-10-as-iran-declares-strait-of-hormuz-open.md) | +1.4% | +2.4% |
| SOY | 2026-07-27 | [Soybeans and corn fall more than 2% as oil drops, wheat also down \| ZAWYA](https://feedsoft.ai/events/8284-soybeans-and-corn-fall-more-than-2-as-oil-drops-wheat-also-down-zawya.md) | -6.1% | -1.8% |
| SOY | 2026-07-27 | [Corn and Soybeans Fall on US Weather, Pause in US-Iran Strikes - Bloomberg](https://feedsoft.ai/events/8278-corn-and-soybeans-fall-on-us-weather-pause-in-us-iran-strikes-bloomberg.md) | -6.1% | -1.8% |
| SOY | 2022-01-25 | [Frost risk remains for Black Sea crops: Grain market daily \| AHDB](https://feedsoft.ai/events/43080-frost-risk-remains-for-black-sea-crops-grain-market-daily-ahdb.md) | +6.2% | +16.5% |

## Sources

- livemint.com: https://www.livemint.com/market/cbot-grains-soybeans-fall-as-oil-drops-on-iran-hopes-11785869727323.html

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Data from Feedsoft AI (https://feedsoft.ai/). For information only; not investment advice.