Did US trade policy move cattle prices? The data says no

Twelve months of US trade headlines have kept cattle producers on edge. Tariffs, quotas and new deals for South American competitors have all made the news.

But did any of it actually move prices on AuctionsPlus?

An analysis of 15,138 cattle lots sold on AuctionsPlus between September 2025 and October 2026 says no. Seven US trade policy changes affecting beef were tested. None had a measurable impact on prices, either straight away or up to 11 weeks later.

Australia’s tariff position never got worse

Australian beef has entered the US tariff-free since November 13, 2025, when the 10% Liberation Day tariff was removed.

Beef was then exempted from the Section 122 global tariff in February 2026. It was also exempted from the 12.5% Section 301 forced-labour tariff in July 2026.

That meant the changes that mattered were the ones opening the door wider for competitors, namely Argentina and Brazil.

The September dip looks seasonal

The lean trimmings quota was the closest thing to a smoking gun.

Quality-adjusted prices fell 13% in the three weeks after it opened. The AuctionsPlus price index peaked at 114.0 in the week of August 31 and bottomed at 98.8 in the week of September 21. The index is set at 100 for September 2025.

But the same weeks in 2025 saw an 11% fall with no trade news at all. And prices recovered to 104.6 by early October, while the quota was still open.

Cows held their ground

Lean trimmings are made largely from cow beef. If cheaper imported trimmings were hurting Australian prices, cows should have lost ground against younger cattle.

The opposite happened. Cows rose 4.4% relative to weaners after the 300,000-tonne quota was announced.

The big moves came from closer to home

The year’s largest price swings had nothing to do with Washington.

Prices fell 15% to a low of 83.4 in April 2026. They then climbed about 30% to 110.2 by mid-June. No US trade event lined up with either move.

Seasonal conditions and domestic supply are the likely drivers.

How the analysis worked

Each trade event was compared with the six weeks before it. Prices were then checked across three windows after it: weeks zero to three, four to seven and eight to 11.

Those changes were tested against the moves seen in ordinary weeks, across all 58 sale weeks in the dataset. Every result sat within normal week-to-week variation.

The findings held when lots were weighted by number of head rather than by lot.

What the data doesn’t cover

A few limits are worth keeping in mind:

• Store and breeding cattle only. 91% of cow lots were PTIC breeders. Cull cows, which are priced most directly off US lean beef, are largely absent. Effects on finished or cull cattle may be larger.
• A short history. The data covers 13.5 months, so spring 2025 against spring 2026 is the only like-for-like seasonal check.
• Only moderate to large effects show up. Weekly prices normally move 6% to 9%. The all-lots test needs a move of roughly 12% to 15% to register. The cow versus weaner comparison picks up about 5%.
• Other factors weren’t controlled for. These include rainfall, the exchange rate and China market access.
• Some lots were excluded. Bulls, incomplete records and the top and bottom 1% of prices in each category were removed.
  
  

The takeaway

For store and breeding cattle, US trade headlines have been noise rather than signal. Season and domestic supply remain the factors to watch.

The depth of AuctionsPlus sale data makes this kind of analysis possible. Adjusting for quality differences between lots gives a clearer read on what prices are really doing, not just which cattle happened to sell that week.