If you want to grow a giant pumpkin, seedlings will be available during November from:
Plans are already underway for The Great Pumpkin Carnival 2015, keep an eye out on this website to keep up to date with what is happening.
If your growing a giant pumpkin planting at the end of October is the ideal time, for other varieties you can leave it a bit later.
Don’t forget about all the great categories you can enter:
Best Carved Pumpkin