Ambulance response times for critical emergencies have blown out under Premier Daniel Andrews' government.

Labor swept to power at the end of 2014 promising to fix the "crisis" in the state's ambulance service but quarterly data from Ambulance Victoria shows that in 29 out of 79 local government areas, average response times have got worse in the first full year of Labor's rule.

The data compares the March quarter from 2015 to the same quarter this year.

In Opposition, Labor frequently attacked the Napthine government for long response times, often citing cases where patients died.

Despite this rhetoric, only one local council area, Whitehorse, is meeting the benchmark of 90 per cent of Code 1 incidents being responded to within 15 minutes.

The biggest blow-out in response times were in rural areas, with the worst performing zone the Kerang-based Gannawarra Shire, where the average response time jumped from 18.07 minutes to 20.39 minutes in a year.

In Melbourne, response times in Maribyrnong increased by 60 seconds in a year.

Since coming to office Labor has ruled that quarterly response time data be released regularly – the previous government did not release quarterly results.

Averaged out across Victoria, waiting times have improved, as the government insists. Victorians on average have to wait 13.01 minutes for an ambulance, a five second improvement.

But just over three quarters of Victoria's ambulances, 75.6 per cent, arrive within the benchmark 15 minutes, falling short of the 90 per cent target for Code 1 urgent calls with "lights and sirens".

Previously unreleased data from the March quarter in 2014 shows that in all-but 11 local council areas response times have improved, since the Napthine government.

The ambulance service improved by more than four minutes in Hepburn and Golden Plains in the two years to March 2016.

Nine of the areas that saw response times increase are outside Melbourne, including Gannawarra, where residents must wait on average an extra 2 minutes 32 seconds.

On Tuesday, voters in Batman were delivered a letter from the Premier spruiking Labor's achievements, including "ended the ambulance crisis", and calling for residents to vote for a federal Labor government,

The Ambulances Employees Association was a vocal critic of the Napthine government and poor response times but has remained relatively quiet under Labor's rule.

AEA secretary Steve McGhie said a delay in changes to several procedures and new dispatch process had halted reforms, but he believed results would improve soon as changes were rolled out.

A government spokeswoman said under the previous Coalition government the ambulance system was in crisis, with response times blowing out to the worst on Australia's mainland.

"You can't fix damage this deep overnight, but we are working hard and undertaking extensive reform to rebuild our ambulance service and turn response times around," she said.

She said there were already improved results due to government investment with 86 per cent of local governments showing improved Code One response times compared to the last year of the Liberal government.

April's state budget included $144 million for the ambulance system including money for station upgrades and new branches and a $60 million Response Rescue Fund.

Work has also been done to improve dispatch procedures to makes sure patients get the right services.   People who call ambulances but do not need them have contributed to the blow-out in delays.

Shadow parliamentary secretary for health Margaret Fitzherbert said about half of the $60 million Response Rescue Fund "won't be delivered for several years".

"It's not the case that all the rescue fund money is helping communities now," she said.

"One reason why Code 1 response times are getting worse in places like the City of Maribyrnong and in Darebin is big population growth, but Daniel Andrews has no plan to tackle this," Ms Fitzherbert said.

Acting Chief Operations Officer Ambulance Victoria Ian Patrick said paramedics continued to provide excellent patient outcomes in the face of increasing demand for ambulances.

"We know, however, that more needs to be done to meet our targets and community expectations," Mr Patrick said.