The U.S. Department of Agriculture (USDA) released the new version of its Plant Hardiness Zone Map (PHZM), updating a useful tool for gardeners and researchers for the first time since 1990 with greater accuracy and detail. The new map—jointly developed by USDA's Agricultural Research Service (ARS) and Oregon State University's (OSU) PRISM Climate Group—is available online at www.planthardiness.ars.usda.gov. ARS is the chief intramural scientific research agency of USDA. (from the U.S. Department of Agriculture).
Garden on Sherlock Street went from 5b to 6a with the new map.
The website is very easy to use. You can really get detailed information for your area.