I grow all my carrots in pots, Chantenay and Touchon.
Eat them as baby carrots late Summer through to late Winter, with sowings from March through to June.
I keep back a few pots and plant many of the thinnings in those.
Do find you have to be quick, as they dry out and wilt quickly. I water the pot before I sow the thinnings, so easy to plant and less stress.
Do cover the carrots, once sowed, but remove it after their tops are two inches or so high. Do not cober the thinnings.
Have the pots around the plot and never suffered from any carrot fly, think the pots help with that.