Zone 3b planting calendar

What to plant in October: zone 3b

Zone 3b averages its last spring frost around May 25 and its first fall frost around September 15. Everything below is timed from those two dates, so it stays useful whether you're planting for summer or for a fall harvest.

These are zone-average dates. Check an area-level frost estimate from thirty years of nearby weather history and this calendar retimes itself.

Last frost: May 25

First frost: September 15

Winter lows: -35 to -30 °F

Zone 3b Almanac. What growers here actually recorded: sowing weeks, days to first pick, and yields.

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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