backyard discovery 4' x 2' mini greenhouse with temp-activated lid cedar cold frame box, 3/4 front-facing outdoor view of rectangular cedar planter on powder-coated black steel legs, double-wall polycarbonate dual lid with temperature-activated hinge and top handle, sits on lawn by ornamental grasses and a house; often used to extend the growing season and start lettuce or seedlings.
Backyard Discovery 4' x 2' Mini Greenhouse with Temp-Activated Lid
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Backyard Discovery

Backyard Discovery 4' x 2' Mini Greenhouse with Temp-Activated Lid

|21 ratings

Smart summary

Generated by AI
  • Opens And Closes Automatically

    Opens And Closes Automatically

    Temperature-activated hinges open and close lid automatically.
  • Protects Against Frost

    Protects Against Frost

    Double-wall polycarbonate lid captures solar heat so you can grow crops into winter.
  • Room For Deep Roots

    Room For Deep Roots

    The thirteen-inch deep interior liner provides ample room for carrots, beets, and greens.
  • Resists Rot And Rust

    Resists Rot And Rust

    Natural cedar wood and powder-coated steel legs stand up to wet outdoor conditions.

Specifications

  • Product Dimensions: Overall: 4’ L x 2’ 4 ¾” D x 2’ 8” H Liner: 13” D
  • Assembled Product Weight: 94.79 lbs
  • Temperature-Activated Lid: Innovative hinge with heat-sensitive wax automatically opens lid when temperatures exceed 70℉ and closes as it cools with no electricity needed
  • Optimal Insulation: Double-wall polycarbonate lid panels allow natural light transmission while retaining heat for thriving plants
  • Easy Drainage: Wide bottom slats and durable mesh liner ensure optimal drainage to promote healthy root growth
  • Compact Design: Saves space while offering ample room for starting seedlings and protecting plants through every season
  • Ready to Assemble: Pre-cut, pre-drilled, and pre-stained pieces offer easy installation
Current price is Now $299.00
was $349.24
$50.24 off
Ends Dec 14
Prices may vary in club and online
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Shipping

Free for Plus on eligible orders over $50
Columbus, 43215
Arrives by Thu, Nov 19
Return or replace anytime.
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About this item

Product details

Extend Your Gardening Season with Aggie Cold Frame Box

With the Aggie Cold Frame Box from Backyard Discovery, you can enjoy your favorite hobby all year round. This cold box is crafted from durable, naturally rot-resistant cedar wood and is supported by powder-coated steel accent legs. Not only does it look great, but it's also built to last, providing you with a reliable gardening solution for years to come.

Innovative Design for Optimal Plant Growth

The Aggie Cold Frame Box features a strong double-wall polycarbonate lid that captures maximum solar energy. It also boasts an innovative electricity-free, temperature-activated hinge that automatically opens and closes depending on the internal temperature. This is due to a heat-sensitive wax in the hinge that reacts to temperature changes, ensuring your plants are always in the optimal environment.

Spacious and Versatile Gardening Solution

Measuring 48 inches in length, 28.5" in width, and 32.25" in height (angling to a lower front height of 27.25"), and with a 13" deep interior liner, this cold box offers ample space for nurturing your plants. It protects them against wind, cooler temperatures, and first frost, making it a versatile solution for a variety of plants, including lettuce, spinach, kale, arugula, beets, carrots, chard, parsley, and radishes.

Define Your Growing Season

With the Aggie Cold Frame Box, you're no longer constrained by the changing seasons. Enjoy harvesting well into autumn and early winter, and get a head start on spring planting for earlier harvesting. Experience the joy of backyard gardening on your own terms and redefine your growing season with the Aggie Cold Frame Box.

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Key specifications

Specifications

  • Product Dimensions: Overall: 4’ L x 2’ 4 ¾” D x 2’ 8” H Liner: 13” D
  • Assembled Product Weight: 94.79 lbs
  • Temperature-Activated Lid: Innovative hinge with heat-sensitive wax automatically opens lid when temperatures exceed 70℉ and closes as it cools with no electricity needed
  • Optimal Insulation: Double-wall polycarbonate lid panels allow natural light transmission while retaining heat for thriving plants
  • Easy Drainage: Wide bottom slats and durable mesh liner ensure optimal drainage to promote healthy root growth
  • Compact Design: Saves space while offering ample room for starting seedlings and protecting plants through every season
  • Ready to Assemble: Pre-cut, pre-drilled, and pre-stained pieces offer easy installation

Member ratings & reviews

4.9 out of 5 stars
stars
21 ratings21 reviews
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  1. 5 stars86% (18)
  2. 4 stars14% (3)
  3. 3 stars0% (0)
  4. 2 stars0% (0)
  5. 1 star0% (0)
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Showing 1-3 of 21 reviews

Aug 29, 2026
Reviewer name: Gregg
5 out of 5 stars
5 out of 5 stars review

Great for the garden!

This is a wonderful box for starting plants and keeping them safe from the heat. The auto feature of raising the lid when temperatures get too high is wonderful. The lid ought to have a locking mechanism to prevent it from closing on my head - it's happened a couple of times. Overall, I am very satisfied.

Review from backyarddiscovery.com
Helpful?30EPQPLS8WNR15446855388
May 29, 2026
Reviewer name: Greenthumb2026
5 out of 5 stars
5 out of 5 stars review

Great garden addition!

The Aggie Cold Frame Box did not disappoint! The assembly did not take long, and all of the parts fit well together. I am still figuring out how to best use the box with its temperature lid adjustment. It really opens automatically when the inside of the box gets above 70 degrees! It is a beautiful addition to my patio garden.

Review from backyarddiscovery.com
Helpful?30EPQPLS8WNR15446855388
Jul 2, 2026
Reviewer name: Glenna
5 out of 5 stars
5 out of 5 stars review

Amazing cold frame

Backyard Discovery really has quality products. We also have the Willow Greenhouse from them.The instructions manuals are well written and easy to follow. This cold frame is amazing.

Review from backyarddiscovery.com
Helpful?30EPQPLS8WNR15446855388
Current price is Now $299.00
was $349.24
$50.24 off
Ends Dec 14
Prices may vary in club and online
How do you want your item?

Shipping

Free for Plus on eligible orders over $50
Columbus, 43215
Arrives by Thu, Nov 19
Return or replace anytime.

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