Plant Onions in Zone 5a
Seed-starting, transplant & harvest dates for USDA Zone 5a
Start indoors
Feb 19
Transplant
Apr 16
Harvest (~100d)
Jul 25
In Zone 5a, 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 30
First fall frost
Oct 3
Growing season
156 days
Full Onions grow guide → · All crops for Zone 5a →
Frequently asked questions
When should I start onions in Zone 5a?
Start onions seeds indoors around Feb 19 (Zone 5a).
Can I direct sow onions in Zone 5a?
Onions is best started indoors and transplanted in Zone 5a rather than direct sown.