U.S. fertilizer costs remained elevated in mid-September 2026, with seven of eight major nutrients priced above year-ago levels and anhydrous ammonia leading the increase. The pressure matters for American farmers because USDA now forecasts spending on fertilizer, lime and soil conditioners to increase 15.3% in 2026, at a time when total farm production expenses are also climbing. For producers preparing their next crop budgets, the combination of expensive nutrients and tighter margins is making fertilizer purchasing and application decisions increasingly important.

The latest retail market data show that fertilizer prices have become considerably more stable on a month-to-month basis. None of the eight major products in the dataset moved by 5% or more compared with the previous month. But that apparent stability masks an important year-over-year trend: seven of eight fertilizers remain more expensive than in September 2025. Anhydrous ammonia has recorded the largest increase, followed by 10-34-0, urea and MAP, demonstrating that the cost pressure is concentrated particularly in nitrogen and phosphate products.

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Fertilizer prices tell two different stories heading into 2027

Phosphate prices remain firm. DAP averaged $ 925 per ton in mid-September, compared with $ 904 per ton during the comparable period in 2025. MAP reached $ 967 per ton, up from $ 921 a year earlier. For growers, these increases may appear relatively modest compared with the volatility experienced in other fertilizer categories, but phosphate remains an important component of crop production budgets. Even relatively small changes in price can become significant when applied across hundreds or thousands of acres.

Potash and urea provide a striking example of how differently individual fertilizer markets have behaved. Potash has remained remarkably stable, moving from $486 per ton in September 2025 to $495 per ton in September 2026. Urea, by contrast, experienced a sharp run-up during the spring. It started 2026 near $567 per ton and climbed to $866 around late April and early May before retreating to $659 per ton by mid-September, leaving it well below its spring high but still above its year-earlier price.

That distinction is crucial for interpreting today's fertilizer market. Urea is approximately 24% below its 2026 high but still about 6% more expensive than a year ago. In other words, fertilizer prices can fall sharply from spring peaks without becoming inexpensive for producers. This is particularly relevant as farmers, co-ops and agricultural retailers consider purchasing windows for the next crop cycle and evaluate whether current prices provide an opportunity to secure nutrients or whether additional market adjustments could occur.

Anhydrous ammonia presents an even stronger example. The average price reached $945 per ton in mid-September, compared with $777 a year earlier, an increase of approximately 22%. Yet anhydrous had climbed as high as $1,118 per ton in late May. September prices therefore sit roughly 15% below the 2026 high while remaining substantially above the previous year's level. For corn growers and other heavy nitrogen users, that gap can translate into a meaningful difference in per-acre production costs.

Liquid nitrogen has followed a similar pattern. UAN28 climbed to $530 per ton in late May before declining to $421 in September, roughly 21% below that 2026 high. UAN32 dropped from $585 to $458 over the same period. The year-over-year picture is much more moderate: UAN28 is approximately 1% higher than in September 2025, while UAN32 is roughly 3% lower. The numbers reinforce why producers need to consider both short-term price direction and longer-term comparisons when evaluating fertilizer purchasing strategies.

Looking specifically at the nitrogen market reveals the magnitude of the adjustment that has already occurred since spring. Urea has fallen approximately 24% from its 2026 high, UAN28 about 21%, and anhydrous ammonia roughly 15%. Those declines provide some relief compared with the peak purchasing environment, but they do not erase the broader cost challenge. In particular, anhydrous and urea remain more expensive than they were during the comparable period last year.

Price per ton also provides only part of the economic picture. Based on mid-September values, anhydrous ammonia represented approximately $0.58 per pound of nitrogen, compared with roughly $0.72 for urea and UAN32 and $0.76 for UAN28. That does not automatically make anhydrous the best option for every operation. Application equipment, timing, soil and weather conditions, transportation, storage, potential nitrogen losses and local product availability all affect the actual nutrient cost and agronomic performance at the farm level.

USDA sees fertilizer spending rising much faster than total farm costs

The importance of those fertilizer prices becomes clearer when placed alongside USDA's latest farm-sector financial outlook. The USDA Economic Research Service forecasts total U.S. farm production expenses at $492.8 billion in 2026, an increase of $21.2 billion, or 4.5%, from the estimated $471.6 billion spent in 2025. Within that enormous cost structure, fertilizer is one of the categories showing particularly strong growth and represents a significant challenge for crop producers managing already tight operating budgets.

USDA expects spending on fertilizer, lime and soil conditioners to increase by $5.3 billion, or 15.3%, in 2026 compared with 2025. The percentage increase is more than three times the projected growth rate for total farm production expenses. That divergence helps explain why fertilizer remains at the center of farm-budget discussions even after several nitrogen products retreated from their spring peaks. Lower prices than in May do not necessarily mean lower annual fertilizer expenditures for American agriculture.

The pressure becomes more evident when farm income is added to the equation. USDA forecasts net farm income at $158.4 billion in 2026, down $4.3 billion, or 2.6%, from 2025 in nominal terms. After adjusting for inflation, the projected decline reaches 5.5%. Farmers are therefore confronting a scenario in which overall production expenses are increasing while real sector income is expected to decline, making cost management increasingly important for crop operations heading toward the next production cycle.

Commodity prices and yields will ultimately determine how heavy that fertilizer burden becomes. USDA's current 2026/27 soybean outlook calls for approximately 4.5 billion bushels of production, an average yield of 52.8 bushels per acre and a season-average farm price of $12.00 per bushel. For corn and other nitrogen-intensive crops, the relationship is particularly important because fertilizer represents a larger variable expense. The critical calculation is increasingly how many bushels must be produced and sold to cover nutrient costs on each acre.

For U.S. producers, the fertilizer market is therefore sending two signals at the same time. Several nitrogen products are considerably cheaper than they were during the spring, providing relief from the extreme levels seen earlier in 2026. At the same time, seven of eight major fertilizers remain above year-ago prices, while USDA expects fertilizer-related spending to rise sharply. The market has cooled, but the underlying pressure on farm margins has not disappeared.

As farmers begin shaping 2027 crop budgets, fertilizer purchasing decisions will need to be evaluated alongside commodity prices, expected yields, crop insurance, cash rents, seed, chemicals, machinery, interest costs and working capital. The most important question may no longer be whether fertilizer moves another $20 or $50 per ton. For farm profitability, what ultimately matters is the relationship between the cost of producing each acre and the revenue that acre can generate.