Hail Net Guide for NZ Orchards and Vineyards

It is the middle of November. You are standing in a Central Otago orchard watching a storm roll in off the Remarkables, and you know what is coming. One bad hail event can strip a season’s worth of stone fruit in under twenty minutes. We have seen it happen, and we have talked to growers who lost everything because their netting system was not up to the job.

Why Hail Netting Is Non-Negotiable in New Zealand

New Zealand’s climate is genuinely unpredictable. The same conditions that make Hawke’s Bay and Nelson so productive for apples, pears and grapes also create the perfect setup for convective storms during spring and summer.

Most guides will not tell you this: a cheap hail net is often worse than no hail net at all. Here is why. A poorly rated net tears under moderate hail impact and becomes a trap for debris, pooling water and structural damage that compounds your losses rather than limiting them. We have seen growers in the Waikato replace budget netting twice in five seasons. That is not saving money. That is burning it.

The truth is, hail netting pays for itself when you treat it as infrastructure, not consumable. Permanent or semi-permanent systems over high-value crops consistently outperform seasonal throw-over nets in both protection rating and return on investment across a ten-year horizon.

Choosing the Right Hail Net for Your Operation

Not all hail nets are the same. The key variables are mesh aperture, UV stabilisation, tensile strength and the support structure you are working with.

• Mesh aperture: Smaller apertures give better protection against fine hail but reduce light penetration. For wine grapes, this matters. Balance protection with your canopy’s light requirements.
• UV stabilisation: New Zealand has some of the highest UV radiation levels in the world. A net without proper UV stabilisation will degrade fast, losing tensile strength before it loses its appearance. Do not let a salesperson gloss over this specification.
• Tensile strength rating: Look for nets rated to handle accumulated hailstone weight under load, not just single impact. Hail accumulates. Heavy, wet hail sitting in a sagging net is a structural event.
• Colour and light transmission: White nets reflect more light back onto the canopy. Black nets absorb heat. Depending on your crop and region, one will serve you better than the other.

For permanent orchard structures, anchor point design is just as critical as the net itself. The net transfers load to your posts and wires. If those are undersized, the net specification becomes irrelevant when a storm hits.

If you are working through what suits your orchard or vineyard, our range of hail nets for NZ orchards and vineyards covers options suited to both permanent structures and seasonal deployment.

Installation and Seasonal Timing

Get your nets up before Labour Weekend. Full stop.

In Hawke’s Bay and Nelson, the hail risk window opens in October and runs hard through to February. Every season we talk to growers who planned to install in November and got caught by an early storm in late October. The fruit does not care about your installation schedule.

Here is a practical tip that does not appear in any product manual: when you are deploying a throw-over net for the first time on an established tree, walk the net out from the windward side of the row rather than the middle. This gives you far more control over even coverage and reduces the number of times you will need to reposition. It sounds small. On a long row of mature trees, it saves forty minutes and a lot of frustration.

For permanent installations, engage a qualified rigger or fencing contractor who has worked with orchard net structures before. The load calculations for a system spanning multiple bays under snow or hail accumulation are not something to guess at. We have worked alongside Canterbury and Otago contractors who understand this well, and the difference in installation quality is obvious.

Check your nets at the start and end of each season. Look for UV degradation along the top surface, any tears near anchor points, and signs of abrasion where the net contacts wire or post fittings. Small damage found early is a repair job. Ignored, it becomes a replacement job mid-season.

Common Mistakes NZ Growers Make with Hail Netting

Underestimating coverage gaps is the biggest one. A net that covers ninety percent of your canopy still exposes ten percent to direct hail impact, and hail does not hit uniformly. Wind-driven hail at a forty-five degree angle gets under the edges of nets that are not properly secured at the sides and ends of rows.

Second mistake: storing nets badly. UV-degraded nets left bundled in direct sunlight between seasons lose strength faster than nets stored in shade or in a shed. A good shed. Not next to the spray unit where chemical off-gassing can attack the polymer over time.

Third: buying on price alone without checking specifications. In our experience, the price gap between a marginal net and a well-specified one is often far smaller than growers expect, especially when you account for a longer service life.

Frequently Asked Questions

How long should a quality hail net last in a New Zealand orchard?

A well-specified, UV-stabilised hail net installed correctly and maintained properly should last ten to fifteen years in a permanent structure. Seasonal throw-over nets used carefully and stored well can last five to eight seasons. The variable that kills nets early, nine times out of ten, is UV degradation from poor storage or undersized UV stabiliser in the polymer mix.

Can I use shade cloth instead of a dedicated hail net?

No. Shade cloth is not designed to handle hail impact loads. The weave structure, tensile rating and UV specifications are different. Using shade cloth as a hail net is a false economy. It will fail under any meaningful hail event and can cause secondary damage as it tears and collapses onto the crop.

Do hail nets affect fruit colour and size?

They can, depending on net colour and light transmission percentage. White nets with high light transmission have minimal effect on colour development. Darker nets or those with lower transmission ratings can reduce anthocyanin development in red apple varieties. Talk to your agronomist about your specific varieties before committing to a net specification.

Get the Right Setup Before the Season Opens

Do not wait for a storm forecast to start thinking about this. Order early, install early, and inspect before and after every season. If you are unsure what specification suits your crop, region or structure type, talk to someone who has actually worked with these systems in the field.

Browse our full range of orchard and vineyard hail nets at Zuna, or explore the broader agricultural and horticultural product range for ropes, ties and crop protection solutions suited to New Zealand conditions. Call us before you order if your site has specific load or structure requirements. Getting the specification right upfront costs nothing. Getting it wrong costs a season.