Australian farmers are no strangers to cost pressure, but the speed and scale of the current diesel price spike is in a category of its own. In the four weeks to 18 March 2026, the international benchmark price for refined diesel more than doubled, up 109 per cent according to the ACCC. The Singapore Gasoil benchmark, which drives Australian diesel pricing almost immediately, averaged 184.5 cents per litre in the week to 20 March, up from 160.6 cents the week prior and compared with just 87.4 cents averaged across the previous twelve months.
And it kept moving. By the week ending 22 March, the national average retail diesel price had reached 282.4 cents per litre according to the Australian Institute of Petroleum, up another 36.8 cents in a single week. The national average wholesale diesel price sat at 271.6 cents per litre, having risen from 227.8 cents the week before. On Friday 20 March alone, wholesale diesel terminal gate prices across every capital city were tracking between 280 and 288 cents per litre, with Darwin the highest at 287.5 cents.
Regional Australia is carrying the full weight of that. The AIP's regional diesel average for the week ending 22 March reached 283.2 cents per litre nationally, with Victoria's regional average up 40.4 cents on the week prior and Western Australia's regional average rising 38.2 cents. These are not marginal movements. For a grain farmer running a 900-hectare operation through seeding, or a beef producer moving cattle across multiple properties, the cost of diesel is not a line item. It is the difference between a viable season and one that isn't.
Unlike petrol, diesel has no retail price cycle. It moves directly and immediately with international benchmarks, and with around 90 per cent of Australia's supply imported, there is no domestic buffer. The Strait of Hormuz closure has exposed just how directly a conflict on the other side of the world translates to a farmer in Dalby or York being rationed to four or five days of supply. Fuel wholesalers have suspended spot market sales, prioritising contracted customers and leaving smaller and regional operators managing what little they have on hand.
The wholesale picture underscores the structural nature of the problem. The national average diesel wholesale price over the last twelve months was 168.5 cents per litre. It is now 271.6 cents. That is not a spike that gets absorbed quietly at the farm gate.
Reports of diesel theft from farm machinery and storage tanks have risen sharply across Victoria, NSW and Western Australia, a sign of how acute conditions have become on the ground. Farmers can access the fuel tax credit scheme to offset some excise costs, but that mechanism provides no relief against the underlying international price movement.
The downstream effects will take time to fully show, but the direction is not in doubt. Higher operating costs for broadacre cropping, livestock transport, and freight feed through to food prices. The farm diesel crisis is not a story that stays on the land. It ends up in the weekly grocery bill.
