I live in Toronto, near the water, where temperatures tend to be a degree or two warmer than the rest of the city. Should I wait for an above zero day and plant them? The bulbs were stored in my shed, swaddled in cloth, but I brought them inside to my basement when overnight temperatures went several degrees below zero.
Many thanks for any insight you can share.
Assuming your bulbs are tulips, daffodils, or any other spring-flowering bulb, it is still okay to plant them now. Early autumn is the ideal time, as it allows the bulbs to start growing roots before winter, but you can plant pretty well up until the ground freezes.
For more detailed information, please visit this similar Ask a Master Gardener post from a few years back: Is it Too Late to Plant Daffodils?