Zone 3b planting calendar
What to plant in October: zone 3b
A rule-of-thumb starting point for zone 3b: last spring frost around May 25, first fall frost around September 15. 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 25
Typical first frost: September 15
Winter lows: -35 to -30 °F
A quiet month in zone 3b
October 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 November.
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