Growing Asparagus in Zone 3B

Asparagus is the garden’s long-term investment. Plant it once and harvest it for 20-30 years. The patience required in years 1-2 pays off in decades of spring harvests.

Zone 3B has a short growing season — start seeds indoors when possible and use season-extending techniques like cold frames and row covers.

Top Growing Tips

• Plant crowns (not seeds) 4 weeks before last frost for fastest establishment
• Dig trenches 12 inches deep; set crowns 18 inches apart with roots spread out
• Do NOT harvest any spears in year 1; harvest lightly in year 2
• Full harvests begin in year 3 when the bed is fully established
• Let fronds grow all summer — they feed the crowns for next year’s spears

Companion Planting

Good companions: tomatoes, basil, parsley, asters (repel asparagus beetles)

Avoid planting near: onions, garlic, potatoes

Harvest Timeline

Beginning in year 3; harvest spears when 6-8 inches tall before tips feather out

About Zone 3B

USDA Hardiness Zone 3B has an average last spring frost around May 15 and first fall frost around Sep 15. 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.