When gardening pumpkins, there are a few things that you need to know. I’m learning these as I go along. If you live in an area that gets cold in the winter, like I do in Northern Indiana, and you want your pumpkins to be ready for harvest at or around Halloween, then you should consider starting your pumpkins indoors a couple of weeks before threat of frost is past. Pumpkins have a fairly long growing and maturing time, as long as 100-120 days.