Zone 5a planting calendar
What to plant in December — zone 5a
Zone 5a averages its last spring frost around May 10 and its first fall frost around October 1. Everything below is timed from those two dates, so it stays useful whether you're planting for summer or for a fall harvest.
Last frost: May 10
First frost: October 1
Winter lows: -20 to -15 °F
A quiet month in zone 5a
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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