Spot rates are what a broker and carrier agree to on the phone for a load moving in the next day or two. They move constantly — up when trucks are scarce on a lane, down when freight is scarce — and can differ sharply by direction and by day of week.
The spot market is where capacity clears when contract commitments do not cover the freight, and where carriers without dedicated freight find loads. It rewards flexibility and punishes carriers who have to take whatever is posted because their truck is already empty.
Spot and contract rates track each other over time but diverge in the short run: when spot runs well above contract, shippers push to lock in contracts; when spot falls below, carriers lean on their contract book.
Example
A lane that ran at $2.10 per mile last week is posting at $1.85 today because a produce region nearby just went quiet and trucks are piling up. A carrier delivering into that area with no backhaul takes $1.85; one who booked the return three days ago is still getting $2.05.
Why it matters
Spot exposure is a strategy choice. It captures upside when rates spike but leaves the carrier’s revenue rising and falling with the market — which is why most carriers balance it against contract freight.