Zone 5b planting calendar
What to plant in December: zone 5b
A rule-of-thumb starting point for zone 5b: last spring frost around May 5, first fall frost around October 5. Zones are set by winter lows, not frost dates, so two gardens in the same zone can be weeks apart. Measure your ZIP below for dates from your area's own 30-year record.
Typical last frost: May 5
Typical first frost: October 5
Winter lows: -15 to -10 °F
A quiet month in zone 5b
December is a rest-and-plan month here. Use it to order seed, test your soil, repair beds, and map next season's rotation, then jump ahead to January.
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