March 31 Prospective Plantings Preview: What Corn & Soybean Farmers Need to Watch

In 12 days, USDA releases the 2026 Prospective Plantings report — the first survey-based look at what American farmers actually intend to plant this spring. Private surveys are already in, and they point to one of the largest corn-to-soybean shifts in recent years. Here's what the numbers look like, why they matter for prices, and what you should do before March 31.

What the Private Surveys Say

Ahead of the official USDA report, Allendale's annual acreage survey pegs corn planted area at 93.678 million acres — down 5.1 million from 2025 — and soybeans at 85.659 million acres, up 4.4 million. That's even more aggressive than USDA's own February Outlook Forum projection of 94.0 million corn and 85.0 million soybeans.

On the production side, Allendale estimates corn output near 15.693 billion bushels (about 62 million below USDA Ag Forum expectations) and soybean output near 4.528 billion bushels (roughly 78 million above). A CoBank outlook projects soybean acreage rising 6%, with corn, rice, and cotton all declining.

Why the Shift Is Happening

The math favoring soybeans over corn has been building all winter, and three factors are driving it:

1. Input cost gap. Iowa State University's 2026 estimates put corn production costs at ~$912/acre versus ~$679/acre for soybeans — a $233/acre difference in capital outlay. The March fertilizer spike from the Iran/Strait of Hormuz disruption has widened that gap further, with University of Florida researchers estimating it could push an additional 1–1.5 million corn acres to beans.
2. Crop insurance economics. The 2026 projected prices — $4.62 corn and $11.09 soybeans — set the revenue guarantee floor. Soybeans saw a 5.2% bump from 2025's $10.54, while corn dipped 1.7% from $4.70. That 2.4-to-1 soybean/corn price ratio further tilts the incentive toward beans, particularly on farms where a corn-after-corn rotation is straining margins. (American Farm Bureau Federation)
3. Continued margin pressure. The March WASDE held corn's marketing year average price at $4.10/bu and soybeans at $10.20/bu — both well below break-even for most producers. The AFBF estimates break-even at roughly $5.00/bu for corn and $12.27/bu for soybeans. Both crops are underwater, but soybeans require far less capital to plant.

The Weather Factor

Earlier this winter, more than 70% of the Midwest was experiencing moderate to extreme drought. Recent storm systems have brought relief — the U.S. Drought Monitor shows improvements across much of Illinois, Wisconsin, Michigan, Iowa, Indiana, and Missouri after 2–3 inches of rain in the western Great Lakes region. But drought and abnormal dryness persist in parts of Illinois, Indiana, and Ohio, and soil moisture recovery will be closely watched in the weeks ahead.

The Corteva 2026 planting weather outlook offers cautious optimism — forecasters don't see a hot, dry summer on the horizon, and a potential El Niño transition later in the year could bring beneficial rain. But if spring rains stall, some intended corn acres could flip to soybeans at the last minute, since soybeans have a later planting window and are more drought-tolerant in early growth stages.

What Happens If Corn Acres Come In Even Lower?

The market is already pricing in a ~5 million acre corn decline. If the March 31 report shows corn acres below 93 million — or soybeans above 86 million — expect meaningful price reactions:

• Corn: Fewer acres tighten the 2026/27 balance sheet. If trendline yields are 183 bu/ac (USDA's current assumption), every 1 million acres lost cuts production by ~183 million bushels. That's bullish, especially if summer weather cooperates poorly.
• Soybeans: More acres could pressure new-crop prices, but biofuel demand continues to absorb production. The key is whether yields come in above or below trend. At 52 bu/ac and 86 million acres, you get 4.47 billion bushels — still tight relative to crush demand.

Conversely, if USDA's survey shows more corn acres than expected (closer to 95M), corn could sell off and soybeans could rally on the perception that fewer beans were planted than feared.

New Crop Insurance Rules to Factor In

If you locked in your crop insurance policy before the March 15 deadline, you're working with the finalized projected prices: $4.62 corn and $11.09 soybeans. A few changes from the One Big Beautiful Bill Act are worth noting:

• Area-based coverage now goes up to 95% (previously capped lower)
• Premium subsidies for area-based plans increased from 65% to 80% — making SCO and ECO significantly more affordable
• ARC enrollees can now purchase SCO coverage, which was previously limited to those enrolled in PLC

These changes make it cheaper to layer coverage on top of your base policy, which matters in a year where both crops are projected to lose money on a per-acre basis.

What Should You Do Before March 31?

1. Know your break-even. The AFBF estimates ~$5.00/bu corn and ~$12.27/bu soybeans, but your number depends on your actual costs. Use our free break-even calculator to get your real number in 30 seconds.
2. Set conditional price targets. If corn rallies on a bullish Prospective Plantings number (fewer acres), you want to know exactly where to sell. Have price targets above your break-even ready to go. If you're using KernelAg, set these in your marketing plan.
3. Watch your local basis. Acreage shifts affect basis, too. If your area is planting significantly more soybeans, local harvest-time basis could weaken. Check our basis tracker to see historical patterns for your market.
4. Don't trade the report blind. Markets often overreact on report day and correct within 48–72 hours. If you have sales to make, consider spreading them across the week rather than trying to nail the exact high.
5. Revisit your cash rent math. If you're negotiating fall rent renewals, the Prospective Plantings numbers will inform those conversations. Our cash rent calculator can show you the max rent you can afford at different yield and price scenarios.