Growing Sweet Potatoes in Zone 4B

Sweet potatoes need heat and a long season but are incredibly productive and nutritious.

Zone 4B has a short growing season — start seeds indoors when possible and use season-extending techniques like cold frames and row covers.

Top Growing Tips

• Grow from slips (sprouts), not seed — order or start your own
• Needs 90-120 frost-free days with warm soil
• Black plastic mulch warms soil in cooler zones
• Harvest before first frost — cold damages tubers
• Cure at 80-85°F for 10 days for sweetest flavor and best storage

Companion Planting

Good companions: beans, corn, thyme

Avoid planting near: squash (compete for space)

Harvest Timeline

90-120 days from slips

About Zone 4B

USDA Hardiness Zone 4B has an average last spring frost around May 1 and first fall frost around Oct 1. All planting dates above are calculated from these frost dates. Your specific location may vary — check with your local extension office for the most accurate dates.