What does the Cass Freight Index measure and why does it matter?

The Cass Freight Index tracks changes in North American freight activity and costs based on 37 billion dollars in paid freight expenses from hundreds of large shippers. It is widely considered the most accurate barometer of freight volumes and market conditions, and often leads the ATA tonnage index at turning points, making it a critical leading indicator for supply chain demand.

How significant is the recent recovery after the 3.5-year decline?

The September shipments index of 1.062 represents a 1.9% annual increase, the second consecutive monthly gain after the longest decline on record (3.5 years). While analysts caution that two months do not yet constitute a confirmed trend, the combination of inventory restocking, container import surges, and lower private fleet capacity suggests the recovery is structurally supported, not temporary.

What is driving freight expenditure growth beyond shipment volume?

September expenditures grew 20.4% year-over-year, outpacing shipment growth. The article attributes this acceleration to three factors: higher shipment volumes, rising freight rates, and elevated fuel surcharges. Diesel prices above 6.00 per gallon historically depress consumption, but freight market fundamentals remain strong.

Should supply chains shift more freight to intermodal or rail?

Analysts note that shippers are already executing a modal shift toward rail intermodal to lower costs amid high trucking rates and fuel surcharges. This reflects rational cost optimization in a high-rate environment. Companies should evaluate their intermodal capacity and transit time trade-offs, particularly for non-emergency shipments where modal flexibility exists.

What seasonal patterns should supply chains expect in October and beyond?

The report forecasts that under normal seasonality, shipments could rise 4% year-over-year in October, while expenditures could jump 23% year-over-year. The back-to-school season is underway and the holiday shipping season is imminent, suggesting sustained capacity pressure and elevated rates through the fourth quarter.

Demand Planning

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The signal

The September Cass Freight Index indicates a meaningful shift in freight market conditions, with shipments rising for the second consecutive month after a 3.5-year decline cycle. This marks a structural recovery in trucking and logistics demand driven by modest retail growth, industrial activity, and rising container imports. Supply chain professionals should prepare for sustained demand increases into the peak fall and winter seasons, particularly as intermodal and for-hire capacity constraints tighten and fuel surcharges remain elevated.

Expenditure growth accelerated sharply to 20.4% year-over-year in September, reflecting not only higher shipment volumes but also rising rates and fuel surcharges. The report suggests October could see 23% year-over-year expenditure gains under normal seasonal patterns, indicating cost pressures will persist. Companies should reassess pricing strategies, fuel hedging, and carrier capacity planning to capitalize on demand recovery while managing inflationary pressures.

Analysts highlight a modal shift toward rail intermodal as shippers seek cost advantages, and smaller private fleets combined with rising new equipment sales suggest for-hire volumes will remain elevated. This recovery cycle, while still early, carries implications for procurement timelines, transportation budgets, and inventory positioning ahead of the holiday season.

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Frequently Asked Questions

What This Means for Your Supply Chain

Simulation Suggestion

this week

What if trucking capacity tightens as holiday demand peaks in November?

Simulate a 10-15% reduction in available trucking capacity due to holiday season demand concentration, coupled with reduced private fleet availability. Model impact on shipment lead times, service level compliance, and forced cost absorption or service degradation for lower-priority shipments.

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Simulation Suggestion

this month

What if fuel surcharges remain above current levels through Q4?

Model a scenario in which diesel prices sustain above 6.00 per gallon through December, maintaining 15-20% fuel surcharges on trucking rates. Assess impact on total transportation cost budgets and evaluate the breakeven point for modal shift decisions (truck versus intermodal).

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Simulation Suggestion

strategic

What if container import volumes surge further, extending intermodal lead times?

Model a scenario where container imports increase 20% above forecast due to accelerated port activity, creating congestion in intermodal rail networks and dwell yards. Assess impact on shippers already shifting freight to intermodal for cost savings and evaluate alternative routing or mode mitigation strategies.

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