If you want to fill your garden with colour next spring, plant bulbs from October to December, before the first frost. Daffodils, tulips, crocus, grape hyacinths and fritillarias are just some of the plants to choose from.
To plant bulbs...yes, too late. As naked bulbs to be dibbled in to the soil. They are sprouting and don't take kindly to being woman-handled. Or, man-handled, either.
What I do when I forget to plant bulbs is when they start offering bulb flowers as potted flowers (I'm partial to the miniature daffodils called 'Tete-a-tete'), I buy a flat of the potted bulbs (fifteen small pots of probably three to four bulbs each)and then plant them. I did this last week and I presently have a dozen small pots of ready to bloom tiny daffs ready to plant in to my garden. I've been doing this each year for maybe ten years now or more. Every year. I lose some from year to year, but some also establish themselves and start multiplying.
Here, they offer not just miniature daffs, but regular daffs, hyacinth, crocus, and tulips, as well. Obtain from provisioners who sell garden materials. They often have them in temporary pots. Do not buy florist bulbs and then expect them to survive outdoors....they tend to be 'hothouse' varieties which do not flourish in outdoor spaces.