For maybe a week or two but depends entirely on where you live, your climate. Deep shade and good consistent soil moisture or quality will decline quickly.

Or you can just harvest, chop/slice and freeze or dehydrate them and be good for many months.

Dave

Thanks, I didn't realize they could be dehydrated too. I'll probably keep them where they are for another week or so, then harvest and freeze some, dehydrate some.

Frozen leeks work well for me in my omelets, soups, stews ect. I do find I can put them in a large plastic garbage bag after picking and store in the fridge for up to 2 weeks after picking and they are ok.