The Melbourne couple, from Hillside, called 000 about 9.20pm on Sunday.

The man and woman had walked from Wonderland Carpark and became stuck at the Elephant's Hide after they accessed a closed track.

The Elephants Hide has been closed since severe flooding caused landslips in the national park last January.

Other parts of the park also remain closed and are marked with warning signs and barriers.

Stawell police and SES members drove to Mt Victory Road where they called the couple by mobile phone.

Police and SES, in conjunction with Victoria Police Search and Rescue Squad members in Melbourne, decided the terrain was too treacherous to rescue the couple on Sunday night.

Authorities regrouped on Monday at 5.30am and rescued the couple by 8am.

Stawell police remained on Mt Victory Road, from where they could see the bushwalkers, while in voice contact with Stawell SES members who guided the bushwalkers to safety.

SES members met the bushwalkers halfway down the Elephant's Hide and gave them food and drink, because they had not had any overnight.

Acting Sergeant Darryle Harrison of Halls Gap said the pair told police they entered the closed area because they wanted to go for a walk.

Grampians National Park ranger in charge David Roberts said Parks Victoria had genuine reasons for closures, which visitors needed to respect.

He said emergency service workers could have difficulty rescuing people from closed areas.

Parks Victoria yesterday reopened a walking track which leads to the summit of Mt Abrupt in the southern Grampians. Since flood recovery works began in the park after severe flood damage in January last year, 17 walking tracks have reopened.