But Ridley's Pest Control owner David Hodgens said it wasn't enough to call it a "plague".
“We've definitely seen an increase of mice around and I'd say it's ahead of when it normally is,” he said.
“We tend to get a rush around late-March or into April when everything has cooled down, but we started to see them come out in late February this year because the autumn weather has come early.”
Mr Hodgens said he had also seen an increase in the amount of calls his business was getting to control mice compared to this time last year.
“At this point we would usually get about five to 10 calls a week, but now we're seeing up to 20 in a week,” he said.
When attending these call-outs, Mr Hodgens said he wasn't seeing the amount of rodents he had seen in the past.
“I've been through two big mouse plagues and this isn't even close,” he said.
“It's just increased activity. The difference being you would have to open up the man hole in a roof and see them running or more in the kitchen, but it's not to the point at this stage where they're chewing through wires and water pipes or soiling everything.
“I would say we're seeing above average amounts of activity, but not to the degree where I would call it a plague.”
An Agriculture Victoria spokesperson said the department was aware of an increased mice populations in some parts of the state, but believed it was not widespread.
“Agriculture Victoria is closely monitoring the situation and supporting farmers with management advice,” the spokesperson said.
But Mr Hodgens said it was still important to prepare for mice being around, regardless of the magnitude of their numbers.
“It's a bit like flood or fire control, be proactive before they come,” he said.
“General housekeeping is the biggest thing, don't make it easy for rodents and don't leave cat and dog food at the backdoor or in the laundry, pick it up and secure it.
“Make sure all of your outdoor access points are sealed so the mice can't get in easily.”
Mr Hodgens said it may be difficult to see if you do have an infestation in some instances.
“You may not be able to tell in a lot of your outside areas unless you see them running around in the garden shed, but look out for droppings in your home or listen for noises in the roof,” he said.
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