Cass Freight Index Sends a Messier Signal: Rates Are Climbing Even When Shipments Aren’t

The freight market loves simple narratives. March’s Cass Freight Index does not give you one.

If you only look at shipments, the market still looks soft. If you only look at spend and rates, it looks a lot tighter. Both things are true, and that is exactly why transportation teams should stop treating “loose market” as an all-purpose excuse for lazy planning.

According to the March 2026 Cass Transportation Index report, the Cass Freight Index shipments reading landed at 1.007, down 4.5% year over year, even after a 3.0% month over month increase. On a seasonally adjusted basis, shipments were up 1.0% from February, which suggests freight demand is no longer falling apart, but it still is not strong enough to call this a clean recovery.

The spend side told a different story. The Cass Freight Index expenditures reading rose to 3.296, up 4.2% year over year and 4.9% month over month. That means shippers were spending more on freight even though shipment activity remained weaker than it was a year earlier.

That split matters. It tells you transportation cost pressure can rise without a neat, demand-led boom. That is a brutal setup for budgeting teams that were counting on another year of easy procurement.

The market is tightening unevenly, not cleanly

A recent Logistics Management breakdown of the March Cass data framed the signal well: freight rate gains remained firmly intact in March even while shipments were “more of a mixed bag.” That is the operating reality right now.

The cleanest explanation is that supply and mode mix are doing more work than broad-based demand. Cass noted that the heavy less-than-truckload mix in the index likely explains why the shipment signal still looks behind other indicators. At the same time, tightening in dry van truckload is starting to spread into reefer and flatbed, with the potential to pull LTL and intermodal higher too.

That is not a contradiction. It is how freight markets behave when capacity gets tighter faster than volumes recover.

Shippers that rely on year-over-year shipment softness as proof that they still hold all the leverage are reading the wrong part of the dashboard. Lower shipment counts do not automatically mean lower procurement risk when carrier capacity is shrinking, driver availability is tightening, and fuel costs are adding pressure at the same time.

Costs are climbing because the market has less slack

The Cass data gets even more useful when you look one layer below expenditures.

The Cass Truckload Linehaul Index came in at 145.6 in March, which was up 1.8% year over year even though it slipped 0.5% month over month. Cass said equipment capacity is contracting, the market has recently re-entered a driver shortage, and higher diesel prices are offsetting some of the normal downward pressure that usually comes with capacity recovering from winter weather.

In plain English, the market does not need a huge freight surge to get more expensive. It just needs less room for error.

That should change how shippers interpret the current market. A lot of transportation teams still organize their playbook around one blunt question: is the market tight or loose? March’s Cass report says that question is too stupid to be useful.

A better question is this: where is cost pressure building first, even before shipment growth fully returns?

If rates are rising because supply is tightening, then waiting for a big demand headline before acting is the wrong move. By the time the broader volume recovery looks obvious, the budget damage is already done.

Budgeting assumptions are now the real risk

The most important lesson in the March index is not that spending was up. It is why that happened.

Cass explained that expenditures accelerated partly because shipments improved sequentially, but the bigger implication is that cost inflation is reappearing before many shippers have rebuilt margin into their transportation plans. After freight expenditures surged 38% in 2021 and another 23% in 2022, they fell 19% in 2023, 11% in 2024, and only 0.5% in 2025. That recent cooling clearly did not mean transportation costs were permanently tamed. It just meant the market was resetting.

Now the reset is fading.

For finance and procurement leaders, this is where bad habits become expensive. If your annual budget still assumes soft truckload conditions will absorb routing-guide misses, weak lane discipline, and slow bid cycles, March should be a wake-up call. Cost pressure is coming back in pockets that spread faster than the topline shipment numbers suggest.

What transportation teams should do next

This is not a panic story. It is a discipline story.

Three practical moves make sense right now.

First, tighten lane-level visibility. Teams need to know where tender leakage, accessorial creep, or modal substitution is already pushing cost higher. Looking only at total spend hides the problem until it becomes structural.

Second, separate demand softness from procurement comfort. A shipment index that is still down year over year does not guarantee carrier flexibility. If your core carriers are facing tighter driver supply or higher operating costs, they will protect yield long before your network feels fully “busy.”

Third, revisit modal and contract assumptions before summer. Cass expects normal seasonality would still leave the shipments component down about 5% year over year in April, but that does not eliminate the risk of tighter truckload and spillover effects into LTL and intermodal. If your network depends on last-minute coverage or weak backup routing, that softness may not save you.

The freight market in March was not booming. That is what makes the Cass signal more useful, not less. When shipments are still mixed but rates and expenditures are climbing anyway, shippers get an early warning that cost pressure is returning before consensus catches up.

Ignore that warning, and the second half of the year gets more expensive than it needs to be.

If your team needs better lane visibility, cleaner procurement control, and sharper transportation spend management before mixed market signals turn into budget misses, book a CXTMS demo and see how CXTMS helps logistics teams act earlier.