Can kohlrabi survive winters outside that reach 0F on occasion so following Spring they will flower?

seems pretty extreme. But I don't know. Consider your site, how sheltered or open.. Also, bear in mind, you'll have till, maybe January? before the deep freeze hits so you do get a long time in the fall. Another- protecting with row cover or something? I kept lettuce all winter once with milk jugs between and a row cover tent. It's not that much warmer here.
Long Island, do you really get that cold very often? Might be worth the risk,

sallyg said:seems pretty extreme. But I don't know. Consider your site, how sheltered or open.. Also, bear in mind, you'll have till, maybe January? before the deep freeze hits so you do get a long time in the fall. Another- protecting with row cover or something? I kept lettuce all winter once with milk jugs between and a row cover tent. It's not that much warmer here.
Long Island, do you really get that cold very often? Might be worth the risk,

Winters can reach 0 and although it's not everyday days in the 30's for weeks are common.

@Newyorkrita

@Newyorkrita

Honestly I have no idea. I have never grown Kohlrabi.

It's a brassica pretty similar to kale/broccoli, it may survive, it may not, 0 is probably right around their limit. I wouldn't bet on them surviving but I would by no means rule it out.