new usda hardiness zones
Did you see the new usda hardiness zone map? Cool interactive features.
I don't think the new Zone is accurate for my area, however. We were previously Zone 4b (-25 to -20) bordering on Zone 4a (-30 to -25). According to the new map, I am now zone 5b (-15 to -10) bordering on 6a (-10 to -5). Last week with less than a half foot of snow coverage we had a -15 low. Last year this same week the low was -23. Granted we did have about 3 feet son coverage last year when we had that temp.
Just wondering how accurate it is for your regions? Sorry to the canadians in advance - it only cover the US.
Here is a link that might be useful: Hardiness Zones