From Tariff Truce to All-Time Record: How L.A. Became the Essential Gateway for Chinese Goods

The Port of Los Angeles set an all-time cargo record on October 9, processing 1,042,652 Twenty-Foot Equivalent Units (TEUs) in September — the most containers moved in any single month across the port's 118-year history. The total announced by the port eclipsed the previous record, established in July 2025, by more than 20,000 units and closed the curtain on the busiest quarter in the port's recorded history.

The milestone arrives at a pivotal moment. A two-month extension of the U.S.-China trade truce, announced September 23 by Treasury Secretary Scott Bessent, has kept tariffs at current reduced levels while suspending a federal investigation into maritime fees on Chinese-linked vessels — a window of certainty that retailers and importers are actively racing to exploit before the next round of negotiations.

A Complex Built for Volume — Delivering on That Promise

The combined San Pedro Bay port system processed close to 10 million TEUs in the first half of 2026. The Port of Los Angeles alone moved close to 4 million TEUs between June and September — the strongest four-month stretch in the port's history — with loaded imports running 26% above the five-year average as of September. Independently, the Port of Long Beach posted its busiest August on record in August 2026, processing 919,992 TEUs — the fifth-strongest single month in its 115-year history. Long Beach ended all of 2025 with 9.9 million TEUs, its own all-time annual record.

The forces powering the surge: major retailers stockpiling inventory ahead of potential tariff escalations, combined with cargo increasingly diverted away from a drought-stressed Panama Canal. "Consumer demand remains resilient," Port Executive Director Gene Seroka said at his October media briefing, noting that importers were actively restocking and that more cargo was being routed through Los Angeles as competing global trade routes faced growing disruption.

China's Grip: Smaller in Share, Still Dominant in Scale

Looking at percentages alone, the trajectory appears to favor decline. China's share of containerized imports through the Port of Los Angeles has fallen to approximately 40% in 2026, from 53.4% in 2025 and 61% in 2020 — a 21-point erosion over six years driven by tariff pressure, deliberate supply chain diversification, and the accelerating rise of Southeast Asian manufacturing alternatives.

But percentage shifts can obscure what volume means in practice. At current throughput levels, 40% of Port of LA traffic represents an extraordinary absolute flow — more than double what any alternative origin currently delivers. Seroka has stated publicly that China represents "approximately 40 percent of our business, more than two and a half times our next largest trading partner." At Long Beach, CEO Noel Hacegaba noted in January 2026 that China still accounted for roughly 60% of the port's total trade in 2025, down from about 70% six years earlier — a dominance that shows only gradual erosion.

Vietnam Steps In, But Reads Chinese Components

Vietnam has become the Port of Los Angeles' second-largest trading partner in 2026, while Thailand has entered the port's top five for the first time — both developments confirmed by Seroka at his October media briefing. Vietnam-origin volume through Los Angeles has quadrupled over the past decade, reflecting the country's rapid emergence as a critical final-assembly hub.

The diversification narrative, however, comes with a structural asterisk. Willy Shih, a professor of management practice at Harvard Business School who specializes in global manufacturing supply chains, has consistently argued that what appears to be a retreat from Chinese sourcing frequently reflects a change in final assembly geography rather than a genuine reduction in upstream Chinese dependency. Both Vietnam and Mexico remain heavily reliant on Chinese-sourced components — intermediate goods that frequently transit San Pedro Bay regardless of what country name appears on the bill of lading.

Trade Truce Buys Time, But Logistics Are Already Strained

The two-month trade truce extension has injected short-term certainty into trans-Pacific commerce. The National Retail Federation's Global Port Tracker projected 2.31 million TEUs across major U.S. ports for September 2026, up 9.6% year-over-year — enough to make it the year's busiest import month.

The logistics network is running under sustained pressure. Rail dwell times at San Pedro Bay terminals reached their highest point of 2026 in September, and truck turn times extended during peak processing weeks. The Port of Los Angeles approved a $3.4 billion annual budget for fiscal 2026-2027 — a 25% increase — to absorb continued growth, even as the port's own volume forecast assumes a 7% decline to 9.3 million TEUs should the current tariff environment tighten again.

At the same time, Xeneta data shows spot container rates from China to the U.S. West Coast have climbed approximately 344% since the U.S.-Iran conflict began February 28, 2026. The freight benchmarking platform believes rates have reached their post-crisis peak but projects they will remain elevated through year-end, keeping pressure on importer margins even as volumes climb.

The Infrastructure Bet

San Pedro Bay's consolidation as America's primary import gateway is not accidental. The complex benefits from direct Union Pacific and BNSF rail access, some of the deepest draft channels on the West Coast, and proximity to the nation's largest consumer market. Those structural advantages hold regardless of what flag flies on an inbound container.

For now, the ports of Los Angeles and Long Beach are winning a trade war by absorbing its disruptions rather than being squeezed by them — and a record-setting September provides the clearest evidence yet.

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