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.
Last frost: May 15
First frost: September 25
Winter lows: -25 to -20 °F
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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