Best Greenhouse Shade Cloth 2026: Percentages, Types & Top Picks

Quick Answer: The best greenhouse shade cloth for most growers in 2026 is a 40% knitted black HDPE panel with grommets, such as the Agfabric 40% Shade Panel — $22.99 for 6x12 ft on Agfabric’s own store on October 31, 2026, or $0.32 per square foot. For a greenhouse that overheats under the roof, use reflective Aluminet 50% mounted inside ($59.50 for 7x12 ft at Greenhouse Megastore), which reflects heat instead of absorbing it. Match the percentage to your crops: Greenhouse Megastore’s chart puts vegetables and herbs at 40%, most orchids at 50–60% and ferns at 70%.

Shade cloth is the cheapest, fastest fix for a greenhouse that cooks your plants every summer afternoon. The trick is picking the right type and percentage — too little and seedlings scorch, too much and fruiting plants stall. Below are the shade cloths we’d actually buy, plus a plain-English guide to choosing your shade percentage.

Last updated: October 31, 2026 — every price re-checked on the seller’s own store (Agfabric.com and Greenhouse Megastore). Three earlier picks whose prices we could only find on marketplace listings (Shatex, Coarbor, E.share) were replaced with cloth we could verify. We also corrected our lifespan claims: Be Cool Solutions’ black knit carries an 8-year UV warranty and its Aluminet 5 years, so Aluminet does not outlast black cloth, as this guide previously said. We removed a “4–8°C cooler” Aluminet figure we could not trace to a test.

Shade cloth by the numbers:

• $0.16 to $0.71 per square foot — the spread on October 31, 2026, from Agfabric’s 40% cut-edge netting (8x12 ft, $14.98) to a 50% Aluminet grommeted panel (7x12 ft, $59.50, Greenhouse Megastore). Reflective cloth costs about twice as much per square foot as black.
• 8 years vs 5 years — Greenhouse Megastore’s prorated UV-degradation warranty on Be Cool Solutions black knitted shade cloth versus its 50% Aluminet. Custom-cut pieces from the same store carry a one-year limited warranty for personal use.
• 40% — the density Greenhouse Megastore’s chart recommends for vegetables, herbs and bedding plants. It lists 30% for chrysanthemums, geraniums and snapdragons, 50–60% for orchids and 70% for ferns.
• 100 square feet — the size above which Greenhouse Megastore says a shade cloth may need corner-to-corner support cables to stop it sagging; above 400 square feet it suggests cables every 4 feet.

Shading is only half of summer cooling — moving air is the other half. Pair the cloth with our greenhouse fan picks, and use tiered greenhouse shelving to keep trays off a hot floor. For the full order of operations — shade first, then vents, fans, and when a swamp cooler is actually worth adding — see our how to cool a greenhouse guide.

Best greenhouse shade cloth at a glance

Prices are snapshots from each seller’s own store on October 31, 2026. Price per square foot is our arithmetic from the listed panel sizes.

1. Agfabric 40% Shade Panel with Grommets — Best Overall

The Agfabric 40% is the shade cloth we recommend first. Knitted HDPE is the right construction for a greenhouse — it lets hot air escape instead of trapping it under the fabric, and the cut edges won’t unravel. Forty percent is the Goldilocks number: enough to knock down peak-afternoon heat and protect tender growth, but not so much that your tomatoes and peppers sulk. At $0.32 per square foot it is also the cheapest grommeted panel we could verify on a maker’s own store. The pre-installed grommets make it a 10-minute job to lash over a hard-panel kit like our best greenhouse kit picks. For an 8-foot-wide greenhouse, size up to Agfabric’s 12-foot-wide panels so the cloth reaches both eaves.

2. Be Cool Solutions 50% Aluminet — Best for Hot Climates

If you garden in the Southwest, the Deep South, or anywhere summers are brutal, Aluminet earns its premium. Ordinary black cloth absorbs sunlight and re-radiates some of that heat; Aluminet’s metallic knit reflects it. It is also the one cloth meant to go inside, which suits hard-panel kits where you cannot easily lash cloth over the roof. We could not find a controlled test that puts a reliable figure on how much cooler it runs than black cloth, so we do not quote one. Two numbers we can confirm: it costs about $0.71 per square foot in a 7x12 ft panel, roughly twice the Agfabric’s price, and its UV warranty is 5 years against 8 years for black knit from the same supplier.

3. Be Cool Solutions 70% Black Knit — Best Heavy Shade

When 40% isn’t enough — you’re growing shade-lovers, or you’re in a desert climate where full sun is punishing — step up to 70%. This black knit blocks most of the incoming light while still breathing, which keeps a greenhouse full of orchids or leafy shade crops from frying. The 8-year UV warranty is the main reason we chose it over cheaper marketplace cloth, and the 12-foot-wide sizes cover an 8-foot-wide kit from eave to eave. Just don’t use this density over sun-hungry fruiting plants; you’ll stunt them.

4. Be Cool Solutions Custom-Cut — Best for Big or Custom Builds

Stock panels are convenient, but if you’ve got a big walk-in or a non-standard shape, order a custom piece. Because it arrives taped and grommeted, there’s no hemming or grommet tape to add yourself, and you can size it to cover the roof only or run down the sunny side. The $150 minimum means it only makes sense above roughly 300 to 450 square feet of black cloth, and the warranty drops to one year, so for anything that fits a stock size, the stock panel is the better buy.

5. Agfabric 40% Shade Cloth Netting — Best Budget

For a mini or small greenhouse, you don’t need much cloth — and Agfabric’s cut-edge netting covers it cheaply. You give up the reinforced edge and grommets, so plan on a pack of clips. It’s the low-risk way to see whether shade cloth solves your overheating before you invest in Aluminet.

What shade percentage do you need?

The single most important choice is the shade percentage — and it depends on your crops, not your greenhouse. Greenhouse Megastore publishes this density chart for its shade cloth:

In practice, 40% is the safest default for a mixed vegetable and seedling greenhouse, and fruiting crops such as tomatoes and peppers should stay at the low end. When in doubt, under-shade — you can always add a second layer, but you can’t give plants back light you’ve blocked. Growing orchids specifically? Our greenhouse for orchids guide covers the full temperature and humidity picture alongside the shade numbers here.

How to choose greenhouse shade cloth

• Type: go knitted. Knitted HDPE breathes and won’t unravel when cut — the right call for an enclosed structure. Woven cloth is stiffer and frays at a cut edge unless it is taped.
• Mount black cloth outside. Blocking sun before it hits the glazing is what actually cools the greenhouse. Reflective Aluminet is the exception and is designed to hang inside, under the roof.
• Match the climate. Black knitted cloth for mild summers; reflective Aluminet where heat is severe.
• Check the warranty. UV warranties ranged from one year (custom-cut) to 8 years (Be Cool black knit) among the cloth we checked; marketplace listings often state none.
• Size for tie-down. Buy a panel with grommets, or add grommet tape to a roll, and use ball bungees so wind can’t tear it loose. Support pieces over 100 square feet with an X of cable so they don’t sag. If your cloth didn’t ship with clips, see our best greenhouse clips guide — butterfly-style fabric clips are gentler on knitted cloth than a stiff snap clamp.
• Pair it with airflow. Shade cloth and ventilation work together — a roof vent or a greenhouse fan plus shade beats either one alone. Our greenhouse ventilation guide covers how to size vents, openers, and fans for your structure.

The bottom line

The Agfabric 40% grommeted panel is the best greenhouse shade cloth for most growers — the right construction, the right percentage, and $22.99 for a 6x12 ft panel. Use reflective Be Cool Solutions Aluminet 50% inside the roof where heat is the problem, go to the Be Cool Solutions 70% black knit for shade-lovers and the longest UV warranty, order custom-cut cloth for big or odd-shaped builds, or save with Agfabric’s cut-edge netting on a compact greenhouse. Get the percentage right for your crops and mount black cloth outside, and a $15 to $75 piece of cloth can save an entire summer’s harvest. Shading an 8-foot-wide walk-in? Our best 8x10 greenhouse guide lists the fitted shade kit Greenhouse Megastore sells for the Riga 3S. And if you’re still choosing the structure itself, a diffusing twin-wall roof does some of this work for you — see our best Palram greenhouse comparison. Shade cloth blocks the sun; a greenhouse misting system adds active evaporative cooling on top of it for the hottest afternoons. Growing a herb bench under that cloth? Our greenhouse for herbs guide covers why Mediterranean herbs and tender herbs like basil need very different light and water routines. Protecting cut flowers instead? Our greenhouse for flowers guide covers the lighter 30–50% density that preserves bloom color better than the heavier percentages this guide recommends for shade-loving crops. Growing something that wants no direct sun at all? Our greenhouse for mushrooms guide covers a crop where a scrap of this cloth over a shaded corner matters more than any percentage chart here. Trying to keep lettuce from bolting in a summer heat wave? Our greenhouse for lettuce guide covers the 86°F threshold where shade cloth stops being optional. Growing in Florida, where near-year-round sun makes shade cloth closer to mandatory than optional? Our greenhouse for Florida guide covers the full UF/IFAS ventilation and cooling picture, not just the cloth. Growing in Arizona instead? Our greenhouse for Arizona guide covers why University of Arizona Cooperative Extension recommends 40–50% for desert heat, and the monsoon-season wrinkle that changes cooling strategy for a few weeks each summer.