Leeks bolted

All leeks will do that eventually but it does normally happen after the whole growing season has passed. I am surprised that this has happened. One question I would ask is and I am assuming you grew them from seed? Were they hardened off properly? If the had for example been in a cosy greenhouse or kept somewhere that never got really cold and then they were planted out and perhaps got really cold for a couple of days they may have reacted to that and set up to seed.

Do you mean leeks you planted last year have now bolted? or they bolted  before you could harvest them in winter?

Exactly mum as pointed out in my post, it is natural for leeks to be bolting now after a full season of growth. Although if you interpret what he has said they way I do he means they all bolted before the were fully grown or perhaps does not realise that leeks are a crop you pick over the course of the year unlike some other vegs that all come at once then you harvest??

One question I would ask is and I am assuming you grew them from seed? Were they hardened off properly? If the had for example been in a cosy greenhouse or kept somewhere that never got really cold and then they were planted out and perhaps got really cold for a couple of days they may have reacted to that and set up to seed.

They were bought from local small garden center and were outside when purchased