A new record has been set for the heaviest pumpkin in Australia and New Zealand.

The Australasian record was smashed by more than 100 kilograms, and by the same grower.

Dale Oliver's winning pumpkin weighed in at 743 kilograms during the Summerland Pumpkin Competition held at Kyogle in northern New South Wales.

In 2013 the Knockrow grower set and then broke his 575 kilogram record with a 619 kilogram pumpkin.

But Mr Oliver said he had grown pumpkins as heavy as 680 kilograms but they weren't officially recorded.

On top of the record and first place in Kyogle he also secured second prize with a 669 kilogram pumpkin.

"We took a few over there to build the numbers because it was a pretty bad season early in spring," he said.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Listen Duration: 4 minutes 33 seconds 4 m 33 s New Australasian record for heaviest pumpkin set by Knockrow nursery owner Dale Oliver ( Kim Honan ) Download 2.1 MB

"Everybody thought it wasn't going to rain again the way it was looking.

"A lot of people had a lot of hard luck with the winds and the dry conditions. It was just not a very good year.

"But I was very lucky. I had overhead water and a bit of shelter from the wind."

Mr Oliver said he only realised a few weeks ago the weight that the pumpkin was gaining.

"They didn't start off as well as what they had in other years, but they just seemed to come through in the end. They grew a lot with the rain," he said.

The record breaking Atlantic Giant pumpkin only took 75 to 80 days to grow.

"[Atlantic Giants] were developed by Howard Dill, probably about 40 years ago they started breeding these," he said.

"Nowadays all them guys over in America, actually all around the world, keep sourcing the biggest genetics and they just seem to be getting bigger, bigger and bigger.

"Back when they had them at 1,500 pounds they were wondering if they'd get to 2,000, now they're looking to break 2,500 pounds (about 1,134 kilograms)."

The Guinness World Record for heaviest pumpkin at 1,054 kilograms (2,323 pounds) belongs to Switzerland grower Beni Meier.

"They don't actually like our climate as much as what they like over there," Mr Oliver said.

"When they grow really well here, they get growing well, but as soon as you get the heat they seem to pull right up."

Mr Oliver is hoping the record holding pumpkin will last until this year's Sydney Royal Easter Show.

The wholesale nursery owner has already fed the 669 kilogram pumpkin to his cattle.