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Overview

Built to withstand challenging conditions, the BioStar 1500 Cold Frame features 8 mm thick polycarbonate panels and a reinforced aluminum frame, delivering exceptional durability and thermal performance. The three independent lid sections allow you to fine-tune ventilation, making it easy to regulate temperature and airflow as weather changes. A unique no-drip panel design keeps condensation off your plants, helping maintain healthy growth and preventing wet foliage.

Whether you’re hardening off seedlings in early spring, overwintering perennials, or giving herbs and greens a protected space when frost strikes, this cold frame offers a smart solution for gardeners who demand more from their equipment. The BioStar 1500 is engineered for reliability, and its clear multi-lid design makes accessing plants simple and efficient.

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Specifications

Product Description:A premium cold frame with 3 adjustable lid sections
Suggested Retail:$524.00
Material: 8mm twin-wall polycarbonate with aluminum frame
Dimensions: 59” x 32” - 16” H (front) to 20” H (back)
Capacity: 3.72 ft3
Weight: 22 lbs

Features:

● 3 separate adjustable lid sections
● 8 mm side walls are thicker than other units
● 1 “quick release” automatic lid opener included
● 4 lid height adjusters included
● Unique “no drip” design prevents unwanted condensation on plants
● Cold frame walls are UV stabilized

Frequently Asked Questions

How does the auto opener on the Biostar 1500 work?

The Automatic Opener includes a black piston that is filled with non-toxic oils (hexadecan-1-ol) that reacts to the temperature inside the cold frame. The warmer it gets inside, the oil heats up and causes the piston to expand, opening the lid.

What is a cold frame used for?

Commonly used for lettuce beds, cool weather vegetables, flowers, and other smaller vegetables and plants. They keep the plants warm and also protect them from wind and heavy rain. The lid can be closed when temperatures drop, or propped open when it warms up. The polycarbonate panels allow UV light in so the plants can grow. They can also be used to overwinter plants or harden off young plants before they go in the ground.

Where’s the best place to set up a cold frame?

Since cold frames are used in the colder months of the year, you will want to set up your cold frame in a sunny spot, ideally south facing.

What is inside the Juwel Biostar 1500 piston?

The piston is filled with non-toxic oils (Hexadecan‑1‑ol) which itself is not dangerous for nature. It is not toxic for organisms and readily biodegradable.

I removed the protective film on my cold frame. How can I tell which side is UV protected and should face the outside?

f the film on the polycarbonate panels are removed and you are unsure of which side has the UV coating, follow the steps below:

Take a UV Flashlight and aim the flashlight down the flutes of the polycarbonate. The side with UV coating will illuminate in a green color and the side without UV coating will not be affected.

My cold frame parts are wrong or missing, what do I do?

You may reach out to our wonderful customer support team. You can email or call us for issues or missing parts. To email, you may click the “contact us” button at the bottom of this page – please include information on the original order so we can most efficiently assist you. You can also call the general customer service line (512-407-8500) and and dial extensions 702 or 703.

Is assembly required?

Yes. The BioStar 1500 requires assembly; a complete set of instructions is included, and most users complete it in one afternoon.

Does it include automatic ventilation?

Yes. It comes with one automatic “quick-release” lid opener to help manage internal temperature without manual lifting.

What kind of plants can I grow inside?

You can grow a wide range of plants: seedlings, herbs, cold-tolerant vegetables, perennials, and more.

How does the “no-drip” design work?

The specially engineered panels direct condensation along internal channels rather than allowing it to drip onto plants, helping keep foliage dry and healthy.

Is it suitable for full-year use?

Yes. The heavy-duty materials, UV-stabilized walls, and strong frame make it suitable for extended use year-round.

Resources & Documentation

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