Plant zones range from 1 (plants that will tolerate temperatures minus 50 degrees F) to 11 (plants that will tolerate temperatures 40 degrees F and above), according to the USDA Plant Hardiness Zone Map at www.usna.usda.gov.
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Utah's zones range from 4 in the northeast to 8 in the southwest. Salt Lake City and environs are safe with Zone 5 plants and lower. Some areas can grow Zone 6 and 7 plants and lower.