About

Defy Frost covers the equipment that extends the growing season: greenhouse kits from the $300 walk-in to the glass orangery, high tunnels, cold frames, heaters, and the frost-protection gear that saves a tomato crop at midnight. The heating math is in real BTUs and dollars, the snow-load ratings come off the manufacturers' own sheets, and the assembly-day reality comes from the people who built the kit. Frost wins against wishful thinking. It loses against preparation.

A backyard greenhouse covered in snow, glowing against a winter dusk — A backyard greenhouse holding its own through a hard snow. Season extension is the whole job. *Wonderlane / Flickr (CC BY 2.0)*

What we cover

The catalog runs from first-greenhouse buyers to growers adding a second structure. If it keeps plants alive past the frost date, it is in scope:

Greenhouse kits: walk-in, lean-to, hobby, and four-season glass.
High tunnels and polytunnels.
Cold frames and low tunnels.
Heaters, thermostats, and the BTU math that sizes them.
Frost cloth, fleece, and row cover.
Foundations, anchoring, and snow- and wind-load ratings.
Glazing: polycarbonate, glass, and film, and how each holds heat.

The editorial standard

Three things have to line up before a number goes on the page. The manufacturers' own spec sheets carry the dimensions, materials, and load ratings. Owner reviews, often hundreds per kit, carry what assembly and a real winter actually feel like. And the heating economics are computed in BTUs and dollars rather than copied from a brochure. Prices and specifications are dated in each article, and an unverified figure is labeled as one on the line where it appears.

Feathered frost crystals spread across a cold pane of glass — Frost on the glass is the deadline. The whole job is beating it. *athos[hun] / Flickr (CC BY-SA 2.0)*

What's out of scope

This is equipment and growing, not health or wellness. There are no medical claims here and no "boost your immunity" garden copy. Rankings and verdicts follow the kit, not the affiliate link, and the full details live on the disclosures page.

Who writes this

The Defy Frost Team. Greenhouse kits, high tunnels, and frost-protection gear for cold-climate growers, weighed by what holds the line through a hard winter.

Corrections

Prices move, models get revised, and ratings get restated. If you find something wrong or out of date, tell us at our contact page. Corrections are welcome and acknowledged where they are made.