2/10/2024 0 Comments Which time zone map![]() “We improved our ability to identify pools of cold air that lie in valley bottoms, increased the amount of information at high elevations, and improved how we modeled proximity to the coastlines of the oceans and Great Lakes,” says Daly. “These tend to be isolated, rather than regional in nature.”Įnhanced data gathering techniques also played a part in revising the zones. “Some changes could have been caused by increased station data, or 68 percent more stations than before, or improvements in modeling techniques between the two maps,” says Daly. The vast amount of new data helped scientists devise the updated map. ![]() It incorporates data from 1991 to 2020 from 13,412 weather stations, compared to the 7,983 weather stations that were used to create the 2012 edition map. Here’s what the new USDA Hardiness Zone Map means for you as a gardener: Why Is There a New USDA Hardiness Zone Map? “The new map is about 2.5 degrees warmer than the previous map on average, which puts about half the country into the next warmer half zone, while half stayed put.” “The map is divided into 10-degree zones and 5-degree half zones,” says Christopher Daly, PhD, professor, and director of PRISM Climate Group, College of Engineering, Oregon State University. The map has 13 zones and is based on 30-year averages for the lowest annual winter temperatures in specific regions. Released in November 2023, the updated map was developed by Oregon State University’s PRISM Climate Group and the USDA’s Agricultural Research Service. The information is so vital for understanding what plants will or won't thrive in your area, that we include this information every time we write about or recommend plants to help readers select those that are most likely to survive winters in their individual gardens.īut, for the first time since 2012, a new plant hardiness map is now available. Does the New Map Change What I Can Grow?įor decades, gardeners and growers have relied on the USDA’s Plant Hardiness Zone map to decide what perennials, shrubs and trees are best to grow in any specific region of the country.Why Is There a New USDA Hardiness Zone Map?.
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