Queensland's sugar industry estimates Cyclone Debbie caused $150 million in damage to the local canegrowers' operations.
Initial surveys have revealed the hardest hit districts around Proserpine and Mackay have lost their entire crops, while others have lost significant portions.
Canegrowers CEO Dan Galligan said the figure was disheartening with the annual harvest due to begin in less than two months.
"The harvest itself is going to be a real challenge because the cyclonic winds have twisted the cane in many directions in some paddocks and it's lying on the ground on many farms meaning the mills will have to deal with high mud and debris levels," Mr Galligan said.
More detailed assessment will be carried out in the next week, but early indications are 35 per cent of all sugarcane in the Proserpine region, worth $50 million, has been damaged, with 20 per cent damaged across the Mackay region, worth $81 million.
In addition to the damage to the crop itself, the cyclone also damaged family homes and left significant damage to sheds and other farm infrastructure and machinery.
Assessments are still being carried out on the cane train network, while all sugar mills and terminals appear to have escaped serious damage.