Grape hyacinths often have foliage all winter and need no extra protection. I have had reports of peonies emerging, and they would need more protection. Don t mulch too heavily before it does get cold, or it may encourage even more growth in the bulbs. I must have planted them too soon. Whatever you do, don t cut the foliage off.
Bulbs only have one set of leaves and flower buds.
Cutting them back would ruin your bulbs. It is not that unusual to have some foliage appearing out of the ground now. Mulch the leaves lightly and be prepared to cover them during extremely cold weather. Bulb foliage is very tolerant of cold weather, but occasionally, we will have some foliage burn. Last year was a bad year for spring bulbs, with the leaves being burned and the bloom period greatly reduced by late freezes.