Plant Onions in Zone 6b
Seed-starting, transplant & harvest dates for USDA Zone 6b
Start indoors
Feb 4
Transplant
Apr 1
Harvest (~100d)
Jul 10
In Zone 6b, the average last spring frost is around April. Onions is a hardy crop, so give it a head start indoors about 10 weeks before that, then move it out after frost danger passes.
Last spring frost
Apr 15
First fall frost
Oct 18
Growing season
186 days
Full Onions grow guide → · All crops for Zone 6b →
Frequently asked questions
When should I start onions in Zone 6b?
Start onions seeds indoors around Feb 4 (Zone 6b).
Can I direct sow onions in Zone 6b?
Onions is best started indoors and transplanted in Zone 6b rather than direct sown.