When can I cut back stems of daffodils and tulips?

Bulbs feed off the foliage.I would leave them alone.

After your bulb plants stop blooming cut off the spent bloom and leave the green stems till they die off naturally. Cutting the green stems back is bad for the bulb that needs nourishment in order to bloom next season. The bulb gets it's nourishment from these green stems. It needs the sunshine and water .. they will die off naturally and when they do just pick them off carefully. Then they will bloom again next year.

Yes, as long as you don't cut back the leaves completely. They need to die back naturally. In the Fall, when the leaves are dried up, it's save to cut back completely, dig them up to transplant them or just to leave them there until next Spring for them to bloom again.

You definitely shouldn't cut the stems or foliage off your daffodils and tulips. The bulbs need the nutrients that the stems and foliage give them, to be able to flourish in the next season. Just plant some other plants around the area that will hide the plants, yet still allow the leaves/stems to get the light and water they need.

be sure your bulbs are still there, squirrels love bulbs and will dig them up and steal them! these types of flowers don't usually require cutting in that way but you can do it just to remove the dead parts

Thank you for your replies. I guess I will leave the foliage. It will get ugly. After they die down I believe I will dig them up and plant them elsewhere.