That should be about right for your area. I sow winter radishes around labor day in z8. Some of the winter radishes will tolerate spring sowing. Watermelon, April Cross, New White spring for example.
Minowase Summer Cross #3 Best fall planted.
Tae Baek winter only
Watermelon, does well spring or fall
They will grow under frosty conditions, but quit and get mushy when the ground freezes.
