A month or so ago, I did a germination test on some old beet seeds. I had about a 60% success rate and couldn't bear to throw away the resulting seedlings. So I planted them in a seed tray and put them in a south window.
They do not get enough light, even a south window in Michigan in February is way too little sunshine. They are very spindly. Since beets grow from a taproot and don't take kindly to being transplanted, I doubt I will get much of a crop from the roots, but perhaps the leaves will be a nice addition to some salads.
As I look out over the back yard, I see today's accumulation of 1-2 inches of snow is blowing and drifting around. I don't think I will be planting these beets outside anytime soon. At any rate, I know I can use that package of seeds!