Best Greenhouse Cover For Winter: Compare Clear Tarps and Covers

#1 · Best Overall

1. ZSLTLDU 18 Mil Cover

• Size: Clear White 14' x 18'

Best for: Multi-season tarp for garden frames.

Why it ranks #1: The 14-by-18-foot clear-white polyethylene cover has three-layer woven construction, UV treatment, and stated tear and puncture resistance for greenhouse use.

Three-layer woven polyethylene at 18 mil gives this 14-by-18-foot cover a denser, tougher construction for protecting a greenhouse through demanding weather. Its clear-white sheeting also passes light toward plants, making it a practical option when you want one broad cover for a garden, farm, chicken coop, patio, or porch.

The three-layer woven polyethylene construction is specified for improved tear and puncture resistance, which can help the cover handle routine outdoor exposure better than an ordinary tarp. UV treatment is intended to resist premature aging, brittleness, and cracking under prolonged sun, supporting repeat seasonal use. At 14 by 18 feet, it suits a broad greenhouse or other listed covering jobs, but that fixed sheet size means you need a structure the dimensions can cover.

Skip it if you need a fitted walk-in replacement cover; Zejoot’s 56-by-56-by-76-inch cover is made for an existing frame.

Choose this sheet for a larger greenhouse or garden project that needs a tough, UV-treated cover and useful light transmission. Its 14-by-18-foot dimensions are the key fit boundary, so plan around the structure before installation.

Listed on Amazon as: 18 Mil Greenhouse Cover, 14x18FT Clear Tarps Heavy Duty Waterproof

#2 · Thickest Listed

2. Ansgery 20 Mil Tarp

• Size: 16X20FT

Best for: Extra-thick cover for harsh weather.

Why it ranks #2: Its 20-mil double-layer woven polyethylene construction is the thickest stated here, with listed resistance to wind, rain, frost, and dust.

A 20-mil thickness and double-layer woven polyethylene give this 16-by-20-foot Ansgery tarp a particularly substantial construction for winter greenhouse coverage. The listing says it resists punctures and handles wind, heavy rain, frost, dust, and extreme cold, making it relevant when the cover faces several kinds of rough outdoor weather.

The 20-mil material and double-layer woven polyethylene are described as providing structural toughness and puncture resistance, useful where a large sheet is exposed to weather and handling. Its stated resistance to wind, heavy rain, frost, and dust erosion supports use through changing winter conditions. At 16 by 20 feet, it can cover a sizeable area, although the fixed dimensions call for a frame or covering area that matches the sheet; the listing also identifies camping as a recommended use.

Skip it if you need a small fitted walk-in cover; Zejoot’s 56-by-56-by-76-inch replacement is sized for an existing frame.

This suits growers who need a large, thick sheet for exposure to winter weather and have a structure that can use its 16-by-20-foot dimensions. It is a general tarp, not a fitted walk-in greenhouse replacement.

Listed on Amazon as: 16X20FT Greenhouse Cover,20Mil Heavy Duty Clear Tarp with Grommet

#3 · Best Light Clarity

3. GSGCFYRN 16 Mil Tarp

• Size: 8FTx12FT
• Dimensions: 144"L x 96"W
• Weight: 3.6 lb

Best for: Bright, secured mid-size tarp.

Why it ranks #3: This 8-by-12-foot clear, triple-layer 16-mil tarp states over 80% light transmission and includes rope and 30 zippers.

More than 80% natural-light transmission is the key feature of this clear 16-mil greenhouse tarp, helping keep covered plants exposed to daylight. The 8-by-12-foot sheet also includes 30 zippers and a 16.4-foot rope, giving you listed accessories for securing or arranging the cover during installation.

The triple-layer woven and coated polyethylene construction is specified for puncture, tear, and wear resistance, supporting use as a durable outdoor cover. Its stated light transmission of over 80% helps preserve daylight for plants beneath the clear material. At 8 by 12 feet, it targets a mid-size coverage area, while the included rope and 30 zippers provide accessories for attachment or adjustment. Those accessories do not change the fixed sheet dimensions, which remain the main fit consideration.

Skip it if you need a 10-by-30-foot sheet; Aulock’s clear tarp offers that larger listed size.

This fits growers who want a clear, reinforced tarp for a mid-size greenhouse and value the included rope and zippers. Check the 8-by-12-foot coverage against your structure, since the sheet itself is not adjustable in size.

Listed on Amazon as: 16Mil Clear Greenhouse Tarp, 8x12FT Heavy Duty Clear Tarp with Grommets

#4

4. ANGAR 16 Mil Tarp

• Dimensions: 5 x 4 x 0.5 in
• Weight: 1.61 lb

Best for: Compact grommeted greenhouse tarp.

Why it ranks #4: The 6-by-8-foot clear tarp has three-layer 16-mil construction, grommets, and listed waterproof and UV-resistant properties for smaller structures.

A 16-mil, three-layer clear film with grommets makes this 6-by-8-foot ANGAR tarp a compact covering option for small greenhouses and winter gardens. Its listed waterproof and UV-resistant properties add weather protection, while the clear, light-permeable material lets light reach the covered growing area.

The three-layer 16-mil construction combines a double-layer film cloth with woven high-strength polyethylene, providing a sturdier sheet for greenhouse or nursery coverage. Grommets give you attachment points when securing the tarp to a suitable structure, while its waterproof and UV-resistant properties address wet weather and sun exposure. At 6 by 8 feet, it is suited to a relatively small coverage area; the product also lists chicken coop roofs and fences among its applications.

Skip it if you need a much larger sheet; Alphatool’s 10-by-30-foot polyethylene cover spans a longer area.

This is a practical choice for a compact greenhouse, nursery, or winter garden that can use grommeted attachment and clear coverage. Its 6-by-8-foot dimensions set a clear limit for larger frames or beds.

Listed on Amazon as: 6X8FT Heavy Duty Clear Greenhouse Tarp, 16 Mil, Waterproof, Grommets

#5

5. Legigo 6 Mil Sheeting

• Dimensions: 2.74 x 13.7 x 11 in
• Weight: 7.6 lb

Best for: Large winter plant-cover sheet.

Why it ranks #5: Its 12-by-26-foot clear polyethylene sheeting is specifically described for winter plant protection, sunlight, and heat retention, though it is 6 mil thick.

The 12-by-26-foot clear sheet gives you generous coverage for a winter growing area or an extra layer over plants. Unlike polypropylene fabric, its clear polyethylene lets sunlight reach plants while retaining heat, a combination the listing highlights for keeping plants warmer during cold-weather growing.

This cover pairs a large 12-by-26-foot format with clear sheeting, so it can span a broad growing area while allowing sunlight through. The product information says the clear material retains heat and helps protect plants through winter, making it useful as an extra cover as well as a growing-area sheet. Its 6-mil polyethylene construction is specified for strength and toughness, but buyers seeking a substantially thicker tarp should account for that listed gauge.

Skip it if you need a heavier tarp for demanding exposure; Ansgery’s 20-mil 16-by-20-foot cover has thicker construction.

Pick this sheet for broad winter plant coverage where sunlight transmission and heat retention matter. Its 6-mil polyethylene format is a relevant boundary if your priority is the thicker construction offered by heavy-duty tarp alternatives.

Listed on Amazon as: 12 X 26 Ft Clear Greenhouse Plastic, Plant Covers Freeze Protection

#6

6. Alphatool 10 x 30 Cover

• Weight: 4.31 lb

Best for: Long polyethylene outdoor plant cover.

Why it ranks #6: The 10-by-30-foot polyethylene cover is listed as waterproof, UV-resistant, and tear-resistant, with protection from rain, snow, and frost.

A 10-by-30-foot polyethylene sheet gives this Alphatool cover an extended reach for protecting outdoor plants from autumn and winter rain, snow, and frost. Its waterproof, UV-resistant construction is also described as a barrier against small animals such as poultry and birds, adding more than weather coverage.

The long 10-by-30-foot format can span extended plant rows or a broad outdoor area, while polyethylene construction provides the listed waterproof and tear-resistant properties for wet-season coverage. UV and corrosion resistance are also specified, supporting use outdoors through changing conditions. The cover can help block small animals, including poultry and birds, from plants. The listing gives no thickness or attachment details, so buyers should focus on the stated dimensions and material when planning installation.

Skip it if you want a stated heavy-duty gauge and included attachment accessories; GSGCFYRN’s 16-mil 8-by-12-foot tarp lists both.

Consider this for long outdoor plant rows needing a waterproof, UV-resistant polyethylene cover and a barrier against small animals. Its listed size is clear, but the supplied details do not state a thickness or installation hardware.

Listed on Amazon as: 10 x 30 ft Greenhouse Cover Plastic Sheeting for Outdoor Plants

#7

7. Aulock 5 Mil Tarp

• Size: 10 x 30ft
• Dimensions: 358.3"L x 118.1"W
• Weight: 3.42 kg

Best for: See-through cover for plant monitoring.

Why it ranks #7: This clear 10-by-30-foot PE tarp allows sunlight through and is UV-resistant, but its stated 5-mil thickness is lighter than several alternatives.

Transparent PE lets you monitor plants without lifting the sheet, a useful distinction for this 10-by-30-foot Aulock tarp during winter coverage. Its clear material passes sunlight, and the product says its UV-resistant construction stays clear and flexible up to three times longer than ordinary plastic.

The 10-by-30-foot sheet covers a long area, while its transparency lets you inspect plants beneath it without removing the cover. The listing also identifies it as waterproof and UV-resistant, making it suitable for greenhouse, garden, or patio use. At 5 mil thick, it is a lighter-gauge option than the listed heavy-duty tarps. A roll of hanging rope is included, which gives you an accessory for securing the sheet during setup.

Skip it if you need a thicker tarp for heavy-duty coverage; Ansgery’s 20-mil 16-by-20-foot sheet has a much heavier listed gauge.

This suits growers who want a long, see-through sheet for monitoring plants while allowing sunlight through, with rope included for hanging. Its 5-mil thickness is the boundary if heavy-duty material is your priority.

Listed on Amazon as: 10x30ft Anti-Tear Clear Tarp Waterproof for Greenhouse, 5 mil

#8 · Best Walk-In Fit

8. Zejoot Walk-In Cover

• Size: 56" x 56" x 76"(Green-PE)
• Dimensions: 56.3"L x 56.3"W x 76.77"H
• Weight: 3.8 lb

Best for: Walk-in frame replacement cover.

Why it ranks #8: The 56-by-56-by-76-inch PE replacement has a roll-up zipper door and UV and waterproof claims, but it fits a specific frame and excludes it.

A roll-up door and zipper access distinguish this 56-by-56-by-76-inch Zejoot cover, letting you reach plants inside a compatible walk-in greenhouse without removing the cover. Its thickened PE material is described as waterproof and anti-UV, offering an enclosure-style replacement for an existing frame.

The cover’s specified 56-by-56-by-76-inch dimensions target a matching walk-in greenhouse frame, and the roll-up door provides a direct way to access plants. A smooth zipper is described as helping the door operate without snagging, supporting repeated entry during watering or tending. Thickened PE is listed as waterproof and UV-resistant for outdoor protection. This is a cover-only replacement: the frame and shelves are not included, so it depends on having the appropriate structure already.

Skip it if you need a loose sheet for an irregular structure; ANGAR’s 6-by-8-foot grommeted tarp is a separate cover sheet.

Choose this replacement when you already own a walk-in frame matching its dimensions and want a zippered roll-up entrance. It does not supply a frame or shelves, so it cannot serve as a complete greenhouse on its own.

Listed on Amazon as: Walk-in Greenhouse Replacement Cover 56×56×76inch (Frame Not Included)

#9

9. AlpineReach Frost Cover

• Weight: 2.46 lb

Best for: Breathable frost blanket for beds.

Why it ranks #9: This breathable 10-by-30-foot frost blanket is stated to protect down to 28°F, but it is garden fabric rather than an enclosed greenhouse tarp.

Breathable fabric that lets light, air, and water pass through makes this 10-by-30-foot AlpineReach frost cover a different kind of winter protection from a plastic greenhouse sheet. It creates an insulating microclimate and is rated to protect plants down to 28°F, supporting cold-weather coverage across garden beds.

The 1.2-ounce-per-square-yard fabric acts as an insulation layer, creating a warmer microclimate around plants while allowing light, air, and water through. That permeability can let you leave the blanket over plants without blocking those inputs, while its stated protection down to 28°F gives a specific cold-weather boundary. UV protection and windbreaking properties add protection against sunburn and wind stress. This is a floating row-cover fabric, not a clear, waterproof greenhouse tarp.

Skip it if you need a waterproof clear tarp; ANGAR’s 16-mil 6-by-8-foot cover is listed as waterproof and light-permeable.

Choose this for garden beds that need breathable frost and wind protection, with stated coverage down to 28°F. Its fabric format lets water and air pass through, so it is not the choice for a sealed greenhouse roof.

Listed on Amazon as: AlpineReach Plant Covers Frost & Sun Protection 10 x 30 ft – Thick 1.2 oz/yd2 Freeze Blanket to Low 28 °F Temperatures Floating Row, Garden Fabric Material, Protect in Winter Cold, Gardening Down

#10

10. Alpurple Frost Cloth

• Size: 32.8 x 9.8 ft
• Dimensions: 393.7"L x 118"W
• Weight: 1.14 kg

Best for: Cut-to-fit broad garden blanket.

Why it ranks #10: The cuttable 32.8-by-9.8-foot non-woven cloth covers up to 300 square feet and passes light and water, but is not a clear greenhouse cover.

A 32.8-by-9.8-foot cuttable non-woven cover gives this Alpurple blanket flexible coverage across up to 300 square feet. You can trim it to a needed shape, while its breathable material allows sunlight and water to reach plants under winter protection rather than enclosing them in clear plastic.

The broad sheet can cover up to 300 square feet, making it useful for multiple plants or extended garden rows, and the ability to cut it lets you tailor sections to different shapes. Its thicker non-woven material is described as breathable, allowing sunlight and water through while protecting plants. That permeability fits beds and outdoor plants needing a frost blanket, but it is a fabric cover rather than the clear polyethylene sheet used for an enclosed greenhouse.

Skip it if you need a clear greenhouse enclosure; Aulock’s 10-by-30-foot transparent PE tarp lets you see plants beneath it.

This suits gardeners covering broad beds or irregular plantings who value a fabric sheet they can trim and that passes water and sunlight. Its non-woven material is the main boundary for enclosed greenhouse use.

Listed on Amazon as: 32.8×9.8 Ft Plant Covers Freeze Protection, Warm Winter Frost Cloth Blanket