Kohlrabi is a "cole" crop and will tolerate a lot of frost. Think cabbage, broccoli. It actually does poorly in really hot weather.
The thing about kohlrabi is it's more than worth it to get the hybrid varieties rather than the old "Vienna" varieties. The old non-hybrids will get woody from the bottom up at a rather small stage. Before hardball size. I grow Grand Duke or Winner varieties depending on what's available. They will get as big as the large softball size and still be good. There are also some "giant" kohlrabi varieties that will get to volley ball size, but those are too long growing and too hard to sell for me.
The tip to picking out a good non-woody kohlrabi is to look at where the leaves are on the bulb. If they are rather close together, it will be woody. If they seem rather far apart, they will be crunchy but not woody.
Carol
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