Agricultural freight is the most seasonal work in Canadian trucking, and the seasonality runs in two directions rather than one. There is an inbound peak in March, April and May, when seed, fertiliser and crop protection have to reach retailers and farms before the ground is ready, and an outbound peak from August through October when the crop comes off. Both windows are short, both are weather-driven, and neither moves to accommodate a carrier who is busy elsewhere. Planning agricultural freight means accepting that the calendar is set by the field, and building the capacity plan backwards from it.
The equipment side is where the squeeze shows first. Hopper trailers, end dumps, air-ride vans for bagged product and flatdecks for equipment and totes are all in demand in the same weeks, and the pool of drivers who are comfortable working farm yards, elevators and gravel approaches is smaller than the pool that runs dock-to-dock freight. A shipper who tenders a hopper load in the third week of September is competing against every other shipper in the region for the same trailers. A shipper who commits volume in July usually has them.
Spring adds a constraint that has nothing to do with demand. Across the Prairies and much of rural Ontario and Quebec, secondary roads go under seasonal weight restrictions during the thaw, commonly known as half-load season. Legal axle weights drop sharply for several weeks, which means a load that runs at full weight in February needs either two trucks or a different route in April. The restriction dates are published by the road authority each spring and they shift with the weather. We check them before quoting rather than after loading, because discovering a half-load road at the farm gate costs a day and a second truck.
Weather also decides what can be picked up at all. A wet harvest pushes the entire schedule right and compresses the same volume into fewer days; a dry one pulls it forward. Neither is predictable in July, which is the argument for flexible capacity rather than a rigid schedule. What works in practice is a committed base of trailers for the volume you are confident about, a named backup carrier for each lane, and a spot allowance for the surge, so that the week the combines run long you are adding trucks rather than looking for a broker.
The last piece is yard reality. Farm and elevator pickups are not docks. Turning room, ground conditions after rain, loading equipment, hours of operation and whether anyone is there at five in the morning all decide whether a truck loads or waits. We ask those questions when the lane is set up, note the answers, and give them to the driver with the dispatch, which is a small piece of administration that removes most of the detention on agricultural lanes. It also tells us which lanes need a driver who has run them before and which can take any qualified truck, and that distinction is worth more in the middle of harvest than any rate negotiation.