Hundreds of people in Ballarat have rallied to provide funds, food, supplies and hay to communities in Victoria devastated by fire, and the effort continues to grow.

Up to 10 trucks will leave Ballarat for Bairnsdale on Sunday morning to deliver hay for distribution to farmers and other supplies for those in need.

The idea began with Dunnstown farmer Karl Britt on Thursday and three of his farmer mates in the Ballan and Dunnstown area to transport hay for farmers in need.

It quickly escalated with generous donations from local businesses and community members of trucks, money for fuel and supplies - now their humble plan to send a few trucks of hay has expanded to an entire convoy of vehicles providing support.

Mr Britt's brother's friend manages a farm at Buchan and is desperate to access feed for his stock.

"They saved the house, the farm and the machinery shed but the fences are gone," he said.

Mr Britt and many other farmers have filled a truck with hay from their own farm to donate to the fire affected areas.

Many businesses from Ballarat and the region have donated their trucks to transport the hay, while members of the community have donated money to pay for fuel and dropped off food, water and other essential supplies.

"It is great. The support has been unbelievable," Mr Britt said.

"It has just snowballed. It shows the country spirit."

Avalon Nursery has donated two of its trucks to help transport the donations.

Owner David Winters said people could donate food, water, animal food and essential items to be transported on the truck at the Avalon Nursery until Saturday afternoon.

Mr Winters has experienced the impacts of fire before on a property in Mansfield during Black Saturday.

"We understand what people are going through. Anything can help. So many people have lost everything," he said.

Mr Britt and other volunteers began working to stack hay onto some of the trucks at Dunnstown on Friday afternoon.

Meanwhile, staff at PRDntionwide Ballarat have been preparing to transport hundreds of bags of donations of food, water and toiletries to Trarlgon in a truck on Saturday.

There they will be packed into hampers by volunteers at Gippsland Farmer Relief and transported to the Bairnsdale Relief Centre.

Communities in East Gippsland, Upper Murray and alpine region were told to leave while they could on Friday.

A state of disaster has been declared across eastern Victoria as authorities fear extreme heat and a dangerous wind change could lead to further tragedy on Saturday.

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