Hardiness Zone 1: -60 to -50 °F
Zone 1 covers places whose average annual extreme winter low falls between -60 and -50 °F (-51.1 to -45.6 °C). The coldest ground in the United States: interior and northern Alaska.
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1 photo Zone 1 Zehr's on the Lake
Zehrs On The Lake is a certified proven winners garden center in Burt, NY. Zehr's goes to great lengths to...
Zone 1 facts
| Full band | -60 to -50 °F (-51.1 to -45.6 °C) |
|---|---|
| Zone 1a (colder half) | -60 to -55 °F |
| Zone 1b (warmer half) | -55 to -50 °F |
| Where it occurs | The coldest ground in the United States: interior and northern Alaska. |
| Yards on YardShare tagged zone 1 | 12 |
Plants rated hardy to zone 1 should survive an average winter low in this band. Summer heat, rainfall, soil, and microclimates still decide the rest, and the full researched zone guide is being built for this page.
Data: 2023 USDA Plant Hardiness Zone Map (USDA and PRISM Climate Group, Oregon State University). Yard counts and photos are live from the YardShare archive; member-entered zone tags are shown as members set them.