Harnois Greenhouses

Greenhouse & Tunnel Structures · Nationwide

Serves: Nationwide

Harnois has designed and manufactured professional greenhouse and large-scale tunnel structures since 1965, helping producers achieve more predictable harvests through controlled growing environments. Their product range covers multi-tunnel Venlo glass houses, wide-span polyethylene tunnels, and season extension structures tailored for vegetable, berry, and flower production. Engineering support provided for all US climate zones.

Features: Since 1965 · Poly tunnels · Venlo glass · Season extension · Climate engineering

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Frequently Asked

What is Harnois Greenhouses?
Harnois has designed and manufactured professional greenhouse and large-scale tunnel structures since 1965, helping producers achieve more predictable harvests through controlled growing environments.
Where does Harnois Greenhouses serve?
Harnois Greenhouses is a nationwide resource serving farmers in all 50 US states.
Does Harnois Greenhouses have a website?
Yes — you can visit Harnois Greenhouses at https://www.harnois.com.
What does Harnois Greenhouses specialize in?
Key features: Since 1965 · Poly tunnels · Venlo glass · Season extension · Climate engineering.