American factory production fell in March after two consecutive months of solid gains, delivering a disappointing result that reflects growing hesitation among manufacturers dealing with elevated energy costs and the economic uncertainty created by the Iran conflict.

Manufacturing output declined 0.1% during the month, according to data released by the Federal Reserve, following an upwardly revised 0.4% gain in February. Economists had forecast a 0.1% increase, making the actual result a modest but notable miss relative to expectations.

Motor Vehicles Lead the Decline

The biggest drag on manufacturing came from the auto sector.

Motor vehicle production dropped 3.7% in March after posting a 2.6% gain in February. The reversal erased much of the prior month’s progress and weighed heavily on the broader manufacturing index.

Other sectors also recorded declines. Output fell in primary metals, machinery, and furniture and related products. Overall production of durable goods, which includes items designed to last three years or more, declined 0.2% for the month.

Nondurable manufactured goods edged down 0.1%, though there were pockets of strength. Production of petroleum and coal products, as well as plastics and rubber goods, managed to move higher during the period.

Iran War Cited as a Major Source of Uncertainty

The Federal Reserve’s Beige Book report, released Wednesday, offered important context for the weakness in manufacturing activity.

The conflict in the Middle East was cited directly as a major source of uncertainty that complicated decision-making around hiring, pricing, and capital investment. The report noted that many firms have adopted a wait-and-see posture in response to the ongoing volatility.

That cautious stance is showing up in the production data. When businesses are uncertain about future demand and input costs, they tend to delay investment and pull back on output rather than risk overextending during a period of unpredictable conditions.

Oil prices have surged more than 35% since the Iran war began, increasing costs for energy-intensive manufacturing operations and squeezing margins across a range of industries.

Broader Industrial Production Also Weakens

The weakness extended beyond the factory floor.

Overall industrial production, which includes manufacturing, mining, and utilities, fell 0.5% in March after an upwardly revised 0.7% gain in February.

Mining output dropped 1.2% following a 2.1% rebound in the prior month. Energy production within mining fell 1.6%, with oil and gas well drilling declining 2.4%. 

The Beige Book noted that while energy sector activity picked up slightly in early April, many producers remained reluctant to increase drilling given uncertainty about whether elevated prices would prove durable.

Utilities output declined 2.3% as demand for heating fell with seasonal temperature changes, reversing a 1.8% gain in February.

Capacity Utilization Edges Lower

A key measure of how efficiently U.S. industry is using its available resources also moved in the wrong direction.

Capacity utilization for the overall industrial sector eased to 75.7% in March from 76.1% in February. That reading sits 3.7 percentage points below its long-run average going back to 1972.

Within manufacturing specifically, the operating rate fell 0.2 percentage points to 75.3%, putting it 2.9 percentage points below its historical average. Lower capacity utilization generally indicates that factories have room to expand output but are choosing not to, often because demand signals or cost conditions do not justify the investment.

A Recovery That Remains Fragile

Despite the March setback, the broader trend for manufacturing has been one of gradual recovery.

Output at factories rose 0.5% compared to a year earlier and grew at a 3.0% annualized rate during the first quarter, rebounding from a 3.2% pace of decline in the fourth quarter of 2025.

That improvement had largely been driven by businesses adjusting to the tariff environment and rebuilding some domestic production capacity. However, the Iran war has introduced a new set of cost pressures and demand uncertainties that threaten to interrupt that momentum.

With energy prices still elevated, business confidence cautious, and the economic impact of the conflict continuing to work its way through supply chains and input costs, manufacturing’s path back to consistent growth remains uncertain in the months ahead.