Growing Raspberries in Zone 4B

Raspberries are a prime-and-harvest crop — learn the simple pruning rhythm and you’ll get buckets of fruit every year.

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

• Summer-bearing: prune out floricanes (second-year canes) after harvest
• Ever-bearing: cut all canes to ground in fall for one big fall harvest
• Mulch heavily to suppress weeds and keep roots cool
• Raspberries spread via underground runners — contain with edging
• Plant in a location with good air circulation to reduce fungal disease

Companion Planting

Good companions: garlic, marigolds, yarrow

Avoid planting near: blackberries (share verticillium wilt), nightshades

Harvest Timeline

Year 2+ after planting; summer or fall depending on variety

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.