Zone 2b
In USDA zone 2b the coldest night of an average winter reaches −45 to −40 °F (−42.8 to −40 °C). 17 ZIP codes (0.0% of all) are in this zone.
Frost dates vary within zone 2b
For the middle half of zone-2b ZIP codes the last spring frost falls between May 16 and Jun 4, and the first fall frost between Sep 1 and Sep 17. The zone measures winter cold, not season length: humid Eastern and dry Western towns in the same zone can be weeks apart. Use your ZIP code for a planting date.
States with zone 2b
← Zone 2a (colder)Zone 3a (warmer) →
Questions
What is the temperature range of zone 2b?
Zone 2b covers places where the coldest night of an average winter (the annual extreme minimum averaged over 1991–2020) is −45 to −40 °F, or −42.8 to −40 °C.
When is the last frost in zone 2b?
Across ZIP codes in zone 2b, the median last spring frost falls between May 16 and Jun 4 for the middle half of places. Zone alone doesn't set the frost date — check your ZIP code.
Which states have zone 2b?
Zone 2b occurs in 1 state; the most ZIP codes are in Alaska.
What can I grow in zone 2b?
Perennials, shrubs and trees labeled hardy to zone 2b or a lower (colder) number should survive a typical winter. Annual vegetables depend on frost dates rather than zone.
Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.