As of 2016, Mathias Willemijns grew the  2624.6 Willemijns 2016 and is now the world record pumpkin.  This pumpkin weighed 2,624.6 pounds.  I remember recently, pumpkin growers were wondering if 2,500 pounds was possible and it clearly is.

2016 World Pumpkin Record

2016 World Pumpkin Record