Hello Paslode,
Broad beans are pretty hardy. I've got some on my veg plot that have been out all winter. However, please make sure you harden them off before planting them out. This involves gradually exposing them to the cold and open air by placing them somewhere sheltered. As we're due to have frost soon you need to be a little careful. You could put them somewhere cool indoors, like an unheated conservatory/greenhouse while they acclimatise to cooler conditions.
Emma
gardenersworld.com team