🪟 Cold Frame Cost Calculator

Estimate the cost to build or buy a cold frame for extending your growing season. Covers polycarbonate kits, DIY wood-and-window builds, and mini greenhouses.

Project Details

Length (ft)

Length of the cold frame along the longest side

Width (ft)

Width of the cold frame front to back

Cold Frame Type (1=polycarbonate kit, 2=DIY wood+window, 3=mini greenhouse)

1 = ready-to-assemble kit, 2 = lumber and old window DIY, 3 = pop-up mini greenhouse

Your Estimate

Enter your details and hit Calculate to see results.

Recommended Tools & Supplies

Top Pick

Soil Thermometer

Track root-zone temperature — most crops need 40°F+ to grow

Garden Stakes

Anchor the cold frame against wind and frost heaving

Editorial picks. Links go to Amazon — we may earn a small commission at no extra cost to you.

Pro Tips

✓ Face the cold frame south to capture maximum winter sun
✓ Prop the lid open on days above 40°F to prevent overheating
✓ A polycarbonate lid insulates better than glass and won't shatter
✓ Lay a layer of straw inside on hard-freeze nights for extra protection
✓ Cold frames extend your season by 4–6 weeks in both spring and fall

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