Horsham's NewAg Consulting agronomist Andrew Newall said crops were looking all right but were quickly running out of soil moisture.

"Things are starting to show signs of moisture stress around the tree lines and it won't be long before we start seeing moisture stress in the paddocks too," he said.

Mr Newall said farmers were starting to raise concerns.

"If there is not decent rain in the next 10 days or so, they will be a bit nervous," he said.

"Everyone is wondering where the next rain will come from."

Mr Newall said crops were worse in the northern Wimmera, near Warracknabeal, Brim and Beulah.

"They are under a lot of moisture stress up there," he said.

"Northern Wimmera farmers are looking for rain desperately, but in the central Wimmera they can hang on a little bit longer."

Mr Newall said winter frost had also caused concern, with some crops suffering up to 20 per cent damage.

"There is stem frost damage in wheat and barley  they are the two crops we are seeing affected most," he said.

"There is a little bit of damage in beans, but they should recover well."

Galaquil farmer Brad Martin said good rainfall in August was critical.

"August is a pivotal month for rainfall and the rain gauge has registered only 10.5 millimetres for the month, falling in the first two days," he said.

"With the lack of subsoil moisture and a run of frosts, needless to say the crops are not looking at their best."

Mr Martin said all activity in his paddock has stopped because of the lack of rain.

"No moisture equates to minimal weeds and no diseases," he said.

He said frost damage had occurred in a hay crop.

"Luckily for us the abundant ryegrass will help fill in the gaps if we do get another rain," he said.

Murra Warra farmer and Victorian Farmers Federation vice-president David Jochinke said he was hoping for good rain this month.

"I am pleasantly surprised as things are looking pretty good at the moment," he said.

"The crops have a lot of potential but it is going to come down to spring.

"If we get a couple of good rains and the temperatures keep cool, then we should be all right."

Mr Jochinke said Wimmera crops were looking good compared with those in the north of the state.

He said he was unsure how much damage winter frosts had caused.

"Frost damage is a hard one, because it gets into the root of the plant, so the only way to tell if it has emerged is to dig for it," he said.

"I've been talking to a lot of people and agronomists, and the consensus is that we don't have it as bad as in the north."