I started my cabbages, cauliflower, and kale today. I discovered to my disappointment that the packet of Romanesco broccoflower that I thought I had was empty.

I may still try to get some seeds. I'm also trying to see if I can grow Brussels Sprouts if I start now. If not, I'll do the later sowing for fall crop.
Since then, I've been going over my game plan too. I want to make use of my cold, cold garage Grow Light Area, which today was holding steady at 55ºF.
I'm seconding the
lettuce. They'll germinate at around 65ºF, after that, they can grow at 40~50ºF, and if you harden them off near freezing temps, cold hardiest varieties can handle down to 20ºF (according to planting instructions). Last year, I know my lettuce managed to survive 24ºF (that was even with floating covers protecting them).
Carrots can germinate at 45ºF according to several growing instructions. I'm going to start some round ones. They do take a while to grow out. I never thought you could transplant carrots, but I last year I started them in deeper (4" or more) pots, then transplant later by poking a hole deep enough for the length of the root and water it in while holding onto a seed leaf, they can be planted out. This year, I'm going to try Jeevon's method of pricking out at seed leaf stage into deeper pots. If I start some tomorrow, I should be able to plant out at pea planting time.
I'm also going to start
beets early. They're supposed to germinate at 50ºF+ and grow best at 55~65ºF. They'll be planted out later in March.
Oh, I see you got a post in ahead of me DV -- eggplants need a warmer growing area so I won't start them until later: Peppers first because they take longer to grow, then earlier tomatoes, then the rest of tomatoes and eggplants.
In case anyone's wondering why I didn't start
broccoli, I let my broccoli go to seed last year, so I'm going to count on them reseeding themselves.... Possibly put up a low tunnel over those beds. It's the De Cicco. I think I'll stick with this HL variety -- although it doesn't form a large main head, it makes a whole bunch of bite size heads -- no need to cut it apart.

I'll start some next week just in case they don't self-seed. De Cicco's maturity date is 48 days and last year, they lasted where they were planted in the shady-er part of the garden (next to the cukes BTW if you saw my post about that), sat tight through the summer, then grew a bunch of side florets in the fall.