Zone 4b planting calendar

What to plant in January: zone 4b

Zone 4b averages its last spring frost around May 15 and its first fall frost around September 25. 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 15
First frost: September 25
Winter lows: -25 to -20 °F
Zone 4b Almanac. What growers here actually recorded: sowing weeks, days to first pick, and yields.

Plan & order

  • Inventory and order seedaround Jan 23

    Sort what you already have, toss anything over 3 years old, and order early while varieties are in stock.

  • Map this year's bedsaround Jan 30

    Rotate families off last year's ground. Nightshades, brassicas and cucurbits each move to a new bed.

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