It depends on what kind of bulbs they are. If they are spring flowering bulbs (daffodils, tulips, hyacinths, etc.), you need to plant them ASAP. IF your ground isn't frozen, put them in the ground. If it is, pot them up. Chances are you're far enough south that your pots won't need insulating, but again, it depends on what kind of bulbs you have.

If the pots are reasonably large - 10-12" high and across, and you originally used a good-quality mix - check to see if they need water.

The garage is providing a micro-climate, either frost-free, or not too much (you've probably gained a zone or two!) so the bulbs are acting as they would, say, for me, instead of snuggling down to wait out the cold.

My winters are usually wet, with overnight frosts gone before lunchtime except for in frost hollows. If I get an eighth of an inch of ice on the pond I'm complaining! The bulbs are fine with this. The early daffs start flowering late July-early August (your January to February) and the others come along according to their type.

Light and moisture and protection from deep/lasting frost is what you'll be needing to provide.

If the garden bed you have in mind can protect from any deep frost then plunging the larger pots is an option. If you feel you have a 'sacrificial' pot, then it could be worth the experiment, if you're unsure.

If the pots you've found are smaller than 10" across/deep, then potting on is probably in order. You might be amazed by the sheer density of the root mass curled around the inside of the pot. And the extra bulbs you've acquired by natural division. Don't try to separate them (although the bulbs could well break apart from the mass if the soil is particularly dry); put them into a bigger pot which will allow at least four inches of fresh mix below the present roots and enough soil above to completely cover the paler green of the stems. (It seems to improve the stiffness of the stems.) Leave the deeper green sprouts above the new soil. Water once, and after then only enough to maintain even damp but never dripping wet.

When your soil is workable in spring you could plant out and let the bulbs finish the season in the soil.

Potting on? You mean planting? Unfortunately, the garden beds are harder than conrete right now.

If we get a warm up, do you think I could get the soil to a workable depth and sink the pots? Then, what portion on the pot I cannot get into the ground, can I just cover with mulch?