Zone 4b — The Settler's Sanctuary
moderate growing season · Frost-free ~120-150 days · Min temp -25°F to -20°F
Where agriculture took firm root in American soil. This welcoming territory hosts sugar maples, hydrangeas, and bee balm that fed both body and spirit of early communities. With 120 growing days, settlers could finally plant with confidence rather than desperation. Your garden continues the legacy of those who transformed wilderness into homeland.
❄️ Frost Dates — Zone 4b
Plant warm-weather crops after this date. Check 10-day forecasts before setting out tender plants.
Count back from this date to know how long your growing window is.
📍 Where is Zone 4b?
Iowa, southern Wisconsin, northern Illinois, much of New England
🌱 Soil & Growing Notes
Rich prairie loams common in Midwest; rockier soils in Northeast. Test pH — amend as needed.
📅 Zone 4b Month-by-Month Planting Calendar
Approximate timing based on average last frost May 7 and first fall frost October 1. Always confirm with a 10-day forecast before transplanting tender crops.
Soil warming — harden off transplants. Direct sow cold-tolerant crops.
Last frost around this month. Safe to transplant warm-season crops outdoors.
Begin fall harvest. Protect tomatoes and peppers on cold nights with row cover.
First fall frost likely. Harvest remaining warm-season crops before a hard freeze.
What Grows Well in Zone 4b?
Zone 4b has a moderate growing season with roughly ~120-150 days of frost-free weather — last spring frost around May 7, first fall frost around October 1. That's enough time for 46+ popular garden plants, from fast-growing leafy greens to longer-season fruiting crops. Below is our curated list of plants that thrive in your zone.
🥕 Best Vegetables for Zone 4b
🌿 Best Herbs for Zone 4b
🍓 Best Fruits for Zone 4b
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