Luckily onions and garlic are handling well lower temperatures, don't worry about them.
We plant them twice a year, in autumn and spring, due to the great conditions in early phase they grew up big, then cold days came with no snow cover. All survived I just had to trim few which were a bit more damaged.

Petunias! Also waiting to see what color will they be. How do you extract seeds from them? Never tried before, always buying...