Assuming the "10" after your name is your growing zone, it doesn't matter, for now, what soil you use, unless you can grow them in air-conditioning with full sun! They're considered a "winter season" crop, although when they say that, they're talking about growing near the frost dates (not literally in winter.) Found a site that tells you more included when, how and what to grow. (Carrots go from round, like golf balls, to the size found in supermarkets, and container gardeners generally need the shorter varieties.) As for soil, since you're growing in a container anyway, seems regular potting soil works fine, but, unless you want some very strange shaped carrots (which are fun, if you have kids, since they might come out with arms and legs), keep anything hard - stones or pebbles - out of it. Check out the link below for info from real pros. This is my first year growing them, and mine are growing slower then the seed package said they were supposed to grow, and we only have four plants quite a few less then planned, even for my small container! Here is a link that might be useful: Growing Carrots - carrot museum (no kidding LOL)

If you stored it in an unheated garage, yes. I've had young Heuchera plants, and other perennials, in 4" plastic pots survive the winter stored inside our garage. I use plastic baby pools to group all my stored plants... it makes adding moisture easier, and it keeps them off the concrete floor. I keep the garage closed all winter, opening the door as little as possible. In early spring, as the weather gets nicer, I open the garage door for periods of time during the day. I close it again before nightfall. The plants slowly come out of dormancy, and once frost isn't an issue any longer, I move the plants back outdoors. Or... you could plant the Heuchera in the garden before winter and protect it with a layer of mulch.

Ditto the above posters. We empty the crispers in our main fridge in the fall and stuff them full of carrots just after the first light frost or two. We cut off the tops about an inch above the shoulders, wash the carrots and store in plastic bags with a paper towel laid in the bottom Carrots get mushy if they're subjected to hard frosts (at least they have for me), especially if the shoulders are above the soil a bit. They're not like parsnips, which can stand more/harder frosts, but they do get sweetest after some cold weather. I plant our carrots in late May and harvest in mid to late September here in zone 2. We've usually eaten up all our carrots by the end of January or early February and they're still bright and crisp then (Bolero variety), so I'm not sure how much longer they would store if we had more space. My mother-in-law uses her carrots well into spring, if I recall, but they're a bit wobbly and covered with hairy roots by then. Once you peel, chop and cook them, though, they taste fine. I'm going to try storing some in our basement in damp peat this winter to a) see how long they last and b) see if they take on any sort of off taste from the peat. I'm hesitant to try the storage in damp peat/soil/sand/etc. method for the main bulk of them until I've tried it once with a test few! :)

Adenn1.....I have the same idea---I have two 4' long 'hayrack' planters on the side of my garage, fairly sheltered, but sunny in the afternoons. I thought I'd put them to use over the winter by growing spinach and dwarf carrots. I might keep a couple of pieces of row cover handy to cover them up if the weather gets really cold (not a frequent occurrence here in Central VA), but otherwise not give them additional protection. I also have a small coldframe where I can grow a few things as back-up, in case my experiment fails! Good luck!