cold frames

Mini outdoor greenhouses

Cold frames are simple garden structures—bottomless boxes with transparent lids—used to protect plants from frost while letting in sunlight.

They function as miniature unheated greenhouses, extending the growing season by sheltering seedlings or overwintering tender plants: Start your lettuce in the cold frame a few weeks before the last frost.

Opposites
heat source

cold framesheated greenhouse

hothouse · hotbed · grow room

scale and permanence

cold framesgreenhouse

Climate-controlled plant enclosure

glasshouse · conservatory · orangery

environmental exposure

cold framesopen field

Unenclosed outdoor space

open ground · direct sowing

Family

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Familiarity
Top 500,000
Profile
Used worldwide · Timeless · Concrete · Rated G