Broccolini in Zone 4a & 4b

Brassica oleracea var. italica x alboglabra

When to plant broccolini in zone 4b

Zones 4a and 4b share the same average frost dates in our data, so this page covers both.

Method: Start indoors: Start indoors from seed, then transplant outside. Broccolini needs a head start most zones can't give it by direct-sowing alone.

Start indoors	Apr 10–Apr 17
Direct sow / transplant outside	May 15–May 22
Estimated harvest	Jul 9–Jul 16 (~55 days after transplanting)

Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1.5-2 ft.

Broccolini is a cross between broccoli and gai lan, both of which this site already covers separately. It is worth its own square because you harvest it on a completely different rhythm.

How broccolini fits zone 4's season

Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Broccolini needs about 55 days from transplant to first harvest.

Good companions

No standout companions recorded yet for Broccolini.

Where to buy broccolini seeds

See why we recommend these suppliers →

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