Cold North

What Can Grow in Zone 3b

Cold northern climate with roughly 100-day growing season. Perennial fruits and many vegetables grow well with proper variety selection.

Zone 3b has average winter lows of -35°F to -30°F (-37°C to -34°C). You can grow kale, cabbage, beets, and many more plants. The frost-free growing season lasts about 100 days.

-35°FWinter Low
-30°FWinter High
100 daysFrost-Free
May 10Last Frost
August 20First Frost
🥕 Vegetables
kale cabbage beets carrots peas lettuce spinach broccoli
🍎 Fruits
strawberries gooseberries currants hardy plums Nanking cherries
🌿 Herbs
chives dill parsley mint thyme oregano
🌸 Flowers
marigolds zinnias pansies snapdragons coneflowers
🌳 Trees & Shrubs
white spruce paper birch green ash Amur maple Siberian elm
💡 Planting Tips

Plant cold crops 2-3 weeks before last frost. Use hoop houses for tomatoes. Mulch perennials heavily for winter protection.

🌱
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📍 States in Zone 3b
AlaskaMinnesotaMontanaNorth DakotaWisconsin
🔀 Neighboring Zones
3a4a

Frequently Asked Questions

USDA Zone 3b has average annual minimum temperatures of -35°F to -30°F (-37°C to -34°C). This temperature range determines which perennial plants can survive winter outdoors.

The average last frost date in Zone 3b is around May 10, and the first fall frost typically arrives around August 20. This gives a frost-free growing season of approximately 100 days.

Zone 3b is well-suited for kale, cabbage, beets, carrots, peas, lettuce. Plant cold crops 2-3 weeks before last frost. Use hoop houses for tomatoes. Mulch perennials heavily for winter protection.

Fruits that thrive in Zone 3b include strawberries, gooseberries, currants, hardy plums, Nanking cherries. Always check that specific cultivars are hardy to your zone before planting perennial fruit trees and shrubs.