Plant Broccoli in Zone 4b
Seed-starting, transplant & harvest dates for USDA Zone 4b
Start indoors
Mar 24
Transplant
Apr 21
Harvest (~65d)
Jun 25
In Zone 4b, the average last spring frost is around May. Broccoli is a half-hardy crop, so give it a head start indoors about 6 weeks before that, then move it out after frost danger passes.
Last spring frost
May 5
First fall frost
Sep 28
Growing season
146 days
Full Broccoli grow guide → · All crops for Zone 4b →
Frequently asked questions
When should I start broccoli in Zone 4b?
Start broccoli seeds indoors around Mar 24 (Zone 4b).
Can I direct sow broccoli in Zone 4b?
Broccoli is best started indoors and transplanted in Zone 4b rather than direct sown.