Answer: You are on the edge between USDA winter hardiness zone 6 and zone 7 depending on your microclimate. The zones are determined based on average winter low temperatures, so the zones are a good guide but not a definite rule by any means. Most of the spring blooming bulbs we consider "hardy" such as tulips, daffodils, crocus, and the like should do well for you.
When reading labels, you'll need plants hardy to zone 6/7 or colder -- in other words, a plant hardy to zone 6, 5, 4 or 3 will be fine in your area. Enjoy that garden!
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