The Sunset Zones
http://www.sunset.com/garden/climate-...
are more accurate than the USDA zones, at least for the west, but those are only a starting point. Not only each region or town, but each garden has microclimates. It's important to become familiar with your site, and the best way to do that is -- to borrow a term from permaculture -- by careful and protracted observation. Finding other gardeners in your area is another good way to learn what varieties they've liked and what their planting schedule is.
If you don't already know about them, look for Eliot Coleman's books about gardening year-round. He's in Maine and uses cold frames inside hoophouses in the winter. I've read about other gardeners in cold-winter climates who have also successfully grown crops under cover.
added: I'm unfamiliar with ecoregions, but they appear to be used for biodiversity conservation planning, rather than for gardening/farming advisories.
Regarding whether to pay attention to hardiness ratings: I'd use them as a starting point and see what works. If you have a garden around a house or other buildings (vs. open fields), you probably can find a bunch of warmer spots for specific plants. For instance, the radiated heat from a south-facing stone wall will provide a warmer spot than a low spot in an open area.
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