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Cedar Cold Frame Greenhouse Plans (48″ × 32″)

A winter garden cold frame built from rot-resistant 2x6 cedar walls and 4x4 corner cleats, with a separate 2x4 glazed lid sash that mounts with exterior utility hinges along the rear wall. It protects cool-season vegetables and seedlings from freezing snow, and pivots open on hinges with a prop stick to vent heat on sunny days.

48″ W × 32″ D × 16.5″ H18 pieces26 screwsGarden
Open & customize in 3D (free)→Sample PDF plan
3D model of the cedar cold frame greenhouse
48″ × 32″ × 16.5″ winter plant protection box: 2x6 cedar wall enclosure, 4x4 corner interior cleats, and a separate 2x4 glazed lid sash mounted with rear hinges for easy ventilation and planting.

Cut list

Identical pieces are grouped. Lengths are finished lengths in inches.

QtyMaterialSizeCutsPieces
2×4x411″Square (90°)Cleats
2×4x416.5″Square (90°)Cleats
5×2x648″Square (90°)Wall Boards
4×2x629″Square (90°)Side Boards
2×2x448″Square (90°)Lid Rails
3×2x425″Square (90°)2× Lid StilesLid Divider

Lumber shopping list

Board counts are optimized from standard stock lengths and include a 1/8″ saw kerf per cut.

Tools you need

Assembly steps

  1. Corner Cleats
    2× Cleat (4x4, 11″) 2× Cleat (4x4, 16.5″)
  2. Wall Enclosure
    5× Wall Board (2x6, 48″) 4× Side Board (2x6, 29″)
  3. Glazing Lid Sash
    2× Lid Rail (2x4, 48″) 2× Lid Stile (2x4, 25″) 1× Lid Center Divider (2x4, 25″)
Want 3D diagrams for every step, board cutting layouts and screw placements? Open this plan in BenchBuild to modify the 3D model, change any dimensions or add pieces, and your cut list updates instantly.

FAQ

How much lumber do I need for this cedar cold frame greenhouse?

1× 4x4 × 8′, 5× 2x6 × 8′, 3× 2x4 × 8′. That is 9 boards in total, optimized from standard stock lengths with a 1/8″ saw kerf.

What screws should I use?

The plan uses 26 wood screws (2-1/2″, 4-1/2″). Use exterior-rated screws for outdoor builds.

Can I customize or modify this plan?

Yes. Open it in the free BenchBuild 3D studio to freely modify the model, resize parts, add pieces, or change lumber dimensions. Your cut list, board count and cost estimate update automatically.

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