However, some of the changes in the zones are a result of new, more sophisticated methods for mapping zones between weather stations. In contrast, the 1990 map was based on temperature data from only a 13-year period of 1974-1986. This is mostly a result of using temperature data from a longer and more recent time period the new map uses data measured at weather stations during the 30-year period 1976-2005. The new map is generally one 5☏ half-zone warmer than the previous map throughout much of the United States.
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To help develop the new map, USDA and OSU requested that horticultural and climatic experts review the zones in their geographic area, and trial versions of the new map were revised based on their expert input.Ĭompared to the 1990 version, zone boundaries in the 2012 edition of the map have shifted in many areas. The latest version of the USDA Zone Map was jointly developed by USDA's Agricultural Research Service (ARS) and Oregon State University's (OSU) PRISM Climate Group, and released in January of 2012. If you want a shrub, perennial, or tree to survive and grow yearĪfter year, the plant must tolerate year-round conditions in your area, suchĪs the lowest and highest temperatures and the amount and distribution of Zone maps are tools that show where various permanent landscape plants canĪdapt. That's why climate zone maps were created. Gardeners need a way to compare their garden climates with the climate whereĪ plant is known to grow well.
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Hardiness Zone, enter your zip code or use the map below.Ĭlick here for more information about hardiness maps.įind your zone using the map below or enter your zip code. If you see a hardiness zone in a gardening catalog or plantĭescription, chances are it refers to this USDA map. The USDA Hardiness Zone Map divides North America into 11 separate planting zones Įach growing zone is 10☏ warmer (or colder) in an average winter than theĪdjacent zone.
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