"Since the 1970s, pumpkin records have routinely been beaten. The rate of record growth has been increasing at a linear rate and does not appear to be slowing down, indicating that there are still substantial genetic and cultural improvements to be made in giant pumpkin growing.[3] Structurally, calculations by David Hu of Georgia Tech indicate that a perfect pumpkin could grow up to 20,000 lb (9,100 kg) without breaking. Other factors, such as overly rapid hydration, can still cause fruit to crack. This is caused by the volume of delivered fluids outpacing the growth rate and flexibility of the skin; much like a bursting balloon.[2] The true upper limit regardless of structural stability and cracks is likely determined by other factors. For example, the number of sieve tube elements in the sugar-conducting phloem in a stem limit the amount of resources available to grow the fruit. There is also a consideration of the climate, diseases, pests, and growing season duration.[8] Every year, about 10,000 growers attempt to grow champion pumpkins, and several thousand make it to official weigh-offs.[5]" Quoting Wikipedia: https://en.m.wikipedia.org/wiki/Giant_pumpkin#World_record_giant_pumpkins_by_year

The current record is 1247 kg. This will be resolved based on the Guinness world record criteria.