The Best Raised Bed Covers and Hoop Kits

Buy hoops first, then the fabric that suits your problem. A fiberglass hoop kit turns a bed you already own into a low tunnel for the price of a couple of bags of compost, and it is what lets every cover below sit above the leaves rather than on them. Over the hoops, Agribon AG-19 row cover is the spring and fall answer -- a few degrees of frost protection and an insect barrier in one -- while insect mesh is the summer answer, because fabric in July cooks the crop it is protecting. If you want a real jump in warmth rather than a few degrees, a clear mini tunnel collects heat instead of just holding it, and if you have not bought the bed yet, a bed that ships with its own hooped cover saves buying twice.

None of this is a greenhouse, and none of it pretends to be. What a cover does is take the two or three nights a year that end a planting, and the three weeks of cabbage white season that strip a row of kale, and remove both for well under a hundred dollars.

Covers do three separate jobs, and most buying mistakes come from assuming one product does all of them. Extension guidance from the University of Maryland lists them plainly: covers raise the temperature and humidity around the plant, extend the season at both ends by providing frost protection, and exclude animals -- which in a home garden means insects, birds, rabbits and groundhogs.

Those jobs peak in different months. Frost protection matters in April and again in late October. Pest exclusion matters from the first cabbage white in May through August. Wind and rain protection matters most over a newly transplanted seedling in any month. A fabric that is right for one is often wrong for another, which is why this page ends with two covers in the shed rather than one.

Row cover is sold by weight in ounces per square yard, and that single number decides both how much warmth it holds and how much light it lets through. The two move in opposite directions, which is the whole trade-off. University of Maryland Extension publishes the grades:

Read the last two columns together. Heavyweight sounds like the safe choice until you notice it blocks half to two-thirds of the light, which in a December that is already short is the resource you cannot spare. For most first gardens the useful pair is a light or medium grade for growing under, and a heavy grade kept folded for the two or three hard nights a year that actually threaten the crop.

Quick picks

#	Product	Best for	Score	Price
1	Top pickWYRJXYB 60Pcs Fiberglass Garden Hoops Grow Tunnel60 pieces of jointed fiberglass rod, building 8 ft hoops	Turning any bed you already own into a low tunnel	8.5★★★★★	$32.99 - View on Amazon
2	Agribon AG-19 Floating Row Cover0.55 oz/sq yd fabric, about 85% light transmission	A few degrees for almost no money	8.4★★★★★	Check price on Amazon
3	Agfabric Garden Netting Insect BarrierFine mesh net, sold in widths from 4 ft to 16 ft	Cabbage moths and birds in warm weather	8.6★★★★★	$31.99 - View on Amazon
4	Outsunny 7 x 3 ft Mini Greenhouse Tunnel7 x 3 x 2.5 ft tunnel, clear PE cover, roll-up zippered door	A clear cover you do not have to build	8.1★★★★★	$37.99 - View on Amazon
5	Quictent Galvanized Raised Bed with CoverMetal bed with hooped mesh and cover	Pest and frost protection	8.0★★★★★	$99.99 - View on Amazon

#ad We may earn a commission - Price as of November 2, 2026

Scores are our own editorial judgment, formed from published specifications and independent sources. They are not aggregated customer ratings, and they are not the result of hands-on testing, which we do not currently do. See how we choose.

A cover laid straight onto the crop is a floating cover, and the lightest grades are designed to be used that way -- they weigh little enough that a young plant simply pushes them up as it grows. It is the cheapest arrangement and it works.

It has one real cost, which extension guidance names directly: in windy weather the fabric rubs, and repeated rubbing abrades and injures stems and leaves. Anything you are growing for the leaves -- salad, chard, brassicas -- shows this first. Hoops remove the problem completely, and UMD recommends a support whenever you move up to a medium or heavyweight fabric, because those are heavy enough to flatten a seedling on their own.

Hoops buy two more things worth having. They give you headroom, so a cover can stay on past the point where a floating one has to come off. And they let you swap what is over the top -- fabric in March, mesh in June, clear plastic in October -- on the same frame.

The commonest ordering mistake is buying fabric the width of the bed. A cover has to go over the hoops and reach the ground on both sides with enough left to pin down, so the width you need is the span across the arch plus the anchoring allowance -- not the 4 ft the bed measures.

1. Measure the arch, not the bed. Over a 4 ft bed, a hoop 2 ft high is roughly a 7 ft arc from one side to the other.
2. Add the anchoring allowance. A foot on each side to pin, weight or bury: that is 9 ft of width over a 4 ft bed.
3. Add the ends. A tunnel loses most of its heat out of its open ends, so add about twice the tunnel height to the length -- 4 ft over an 8 ft bed, giving 12 ft.
4. Then round up to a stock size. Rolls come in fixed widths; the next size up costs little and the offcut is the piece you use over the next bed.

For hoop spacing, UMD's low tunnel guidance is 2 to 4 ft apart and 15 to 30 in tall. An 8 ft bed therefore wants three or four hoops, not two -- and if you are using it in a snowy climate, closer is better, because the span between hoops is what collapses first.

1. 1

   Set the hoops before you plant

   Space them 2 to 4 ft along the bed and push them in far enough to feel firm. In loose raised bed mix that means deeper than you think -- or drive a short length of rebar in first and slide the hoop over it, which is UMD's own method.

2. 2

   Run a line along the ridge

   A length of twine or stretchy clothesline connecting the tops of the hoops stops the fabric sagging between them and stops the hoops folding over sideways in wind.

3. 3

   Drape the cover with the slack at the ends

   Center it, then gather the surplus at each end rather than trimming it. You will want that slack when the crop is taller.

4. 4

   Seal the edges to the ground

   Landscape staples, boards, bricks, sandbags or soil. For pest exclusion this is not optional -- a cover that is not held tightly to the ground is a cover a cabbage white walks under.

5. 5

   Leave one end openable

   Weight the end with a board you can roll the fabric around, so venting on a warm day is a ten-second job rather than an unpinning operation.

6. 6

   Lift it to weed, and put it back

   Weeds grow faster under a cover for exactly the reason the crop does. Pull the cover back, weed, re-pin. Mulching the bed before you cover it cuts that job substantially.

Anything that fruits has to be uncovered when it flowers. Squash, cucumbers, melons, beans and tomatoes all need insects to move pollen, and a cover that keeps cabbage whites out keeps bees out too. UMD's instruction is to remove covers as soon as those crops begin to flower -- a netted squash plant is a lot of leaf for no dinner.

Crops grown for leaves, stems or roots have no such deadline. Spring leafy greens, beets and snap beans can stay covered from sowing to harvest under a lightweight grade, which is the single easiest pest-free crop in a first garden.

The other reason to uncover is heat. Once days are consistently warm, a solid cover works against you, and the choice is to swap to mesh or to take it off entirely.

There is a point where more fabric stops being the answer. A low tunnel is a few degrees and a pest barrier over one bed. A cold frame is a sealed box with a solid lid that holds considerably more warmth and stands up to snow. A greenhouse is a space you can work in through the winter.

The honest buying order is also the cheapest one: covers first, because they cost the least and solve the most common problems; a cold frame next if you want to grow through a real winter; a kit greenhouse only when you want to be in there with the plants. Cold frames covers the middle step, and greenhouse versus cold frame is the comparison to read before spending ten times as much. Whichever you end up in, the same problem follows you indoors: a closed structure overheats, and greenhouse ventilation is the hardware that prevents it.

One pairing worth planning for: hoops and a trellis compete for the same space over a bed. If the bed is going to carry a trellis for climbing crops, put the tunnel over it early in the season and take the hoops out when the trellis goes up.

Row cover lasts one to three seasons depending on grade, handling and weather -- lighter grades degrade faster, and UV is what kills all of them. None of it is currently recyclable, which is a reason to buy the grade you will actually use rather than the cheapest roll.

Store it dry and sealed. Extension guidance makes the point most people learn the expensive way: mice nest in stored row cover and ruin it for the next season. A lidded tote in the garage beats a bundle in the shed corner.

A cover is also the cheapest answer to the question of whether a bed is worth protecting at all. If you are still choosing the bed itself, the best raised bed kits ranks the beds these covers fit, and the raised bed size guide has the widths that make a 4 ft hoop work.