The state government has cut camping fees at the Macarthur national park in half.

Sites currently cost $24.50.

They were doubled in 2014, with strong opposition from the local community at the time.

One resident said Parks Victoria was "pricing people out" when the increase came into effect.

The government made an election promise last year to cut fees across the state.

Fees have also been reduced in the Grampians National Park and the Discovery Bay Coastal Park.

Campers will save more than $15 at campsites and parks at Discovery Bay and the Grampians.

State Energy, Environment and Climate Change Minister Lily D'Ambrosio said camping provided an economic boost.

"Camping is not only a great way to relax and unwind, it's also big business for regional Victoria - keeping local shops and cafes full and supporting jobs," Ms D'Ambrosio said.

"Camping in Victoria has never been more affordable - I encourage families to get outside and enjoy our beautiful parks."

The government said there had been a 63 per cent increase in bookings at Parks Victoria campsites during the school holidays since July 1 - when Labor's half-price camping fees came into effect - compared to the school holiday period last year.

Camping and recreation in the state's national parks contributes $2.1 billion to the tourism industry each year and supports more than 20,000 jobs.

Half price camping fees are available now and have been automatically applied to bookings at parks.vic.gov.au.

For eligible camping trips booked before July 1, Parks Victoria will refund the reduced fees prior to the check in date.