What hardiness zone is Saint John?

Saint John is in Canadian Hardiness Zone 5. Moderate – many shrubs, roses, most vegetables

When is the last frost in Saint John?

The average last frost date in Saint John is Late April (Apr 20–30). Always watch local forecasts as it varies year to year.

What vegetables grow best in Saint John?

Zone 5 gardens in Saint John do well with cold-hardy brassicas, root vegetables, and many perennials. With a short frost-free period of around 155 days, choose varieties with days-to-maturity suited to your zone.

Gardening in Saint John, New Brunswick

Gardening in New Brunswick

New Brunswick offers gardeners a mix of maritime and continental influences. Zone 5 across much of the province allows a broad range of vegetables, perennials, and fruit, with the Bay of Fundy providing a moderating influence along the coast.

Gardening in Calgary

Video

Woman tending a flower garden in Calgary — Tending the flower beds

Woman picking flowers with the Calgary skyline behind her — Picking flowers, city skyline

Woman harvesting vegetables in a Calgary rooftop garden — Rooftop harvest

Planting Calendar – August 2026

Saint John

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Growing season Shoulder This month

Task	Details
Start Indoors	Start leeks for overwintering (mild zones)
Direct Sow	Fall greens: spinach, arugula, mâche
Key Tasks	Harvest garlic when tops die back

Frost Dates – Saint John

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Last Spring Frost

Late April (Apr 20–30)

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First Fall Frost

Mid October (Oct 10–20)

Frost-free period: Approximately 155 days. Always check Environment Canada's local forecast — frost dates can vary by 2–3 weeks depending on microclimates, elevation, and annual weather patterns.