Backyard Discovery

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

|21 ratings
Item # 990362422
Current price is $349.24
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Smart summary

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  • Extended Growing Season: This cold frame box extends your gardening season, enabling harvesting well into autumn and early winter, and facilitating an early start for spring planting.
  • Resilient Wood Construction: Crafted from durable, naturally rot-resistant 100% cedar wood, it features powder-coated steel legs and hardware for enhanced rust resistance and lasting stability.
  • Automatic Temperature Control: An innovative electricity-free, temperature-activated hinge, containing heat-sensitive wax, automatically opens and closes the lid to maintain an optimal internal environment.
  • Efficient Solar Capture: Equipped with a strong double-wall polycarbonate lid specifically designed to capture maximum solar energy for plant growth.
  • Ample Protective Space: Measuring 48\" L x 28.5\" W x 32.25\" H, with a 13\" deep interior liner, it provides generous space and protects plants from wind, cooler temperatures, and first frost.
  • Diverse Plant Cultivation: Ideal for nurturing a variety of plants such as lettuce, spinach, kale, arugula, beets, carrots, chard, parsley, and radishes.
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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
Hero image 0 of Backyard Discovery 4' x 2' Mini Greenhouse with Temp-Activated Lid, 0 of 15

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

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
Oct 23, 2023
Reviewer name: Anonymous
5 out of 5 stars
5 out of 5 stars review

Great small starter box

[This review was collected as part of a promotion.] This cute little box would be great for renters and beginning gardeners. It well built and sturdy. I would certainly entertain this for a school project, elderly or kids also. Having the temp activated lid help for beginners.

Review from backyarddiscovery.com
Helpful?30EPQPLS8WNR15446855388
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

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