I'm about to plant daffs and tulips and assume I simply leave them on my back deck over winter. . . . . true?
How to Plant Bulbs in Pots
Certified GKH Gardening Expert
This article should help (you can pretty much treat the daffodils the same way): https://www.gardeningknowhow.com/ornamental/bulbs/tulips/care-of-tulip-bulbs-in-containers-in-the-winter.htm
If you have planted them in pots yes they will be fine.