How grapes are harvested

Quick answer: what happens during grape harvest?

Grape harvesting is the planned removal of wine grapes from the vine, followed by collection, transport and delivery to the winery for processing.

The timing is a decision, not a single date on the calendar. A grower and winemaker may consider the grapes’ sugar or soluble-solids level, acidity, pH, flavour and tannin, as well as the weather, disease pressure, vineyard conditions, intended wine style, available labour, machinery, transport and winery capacity.

Once a decision is made, grapes may be picked by hand or by machine. They are collected in containers or harvester systems, moved to the winery and often sorted to remove unsuitable fruit, leaves, stems and other material. The condition of the grapes at this point can affect what happens next.

In Australia, harvest timing varies considerably. Climate, region, elevation, variety, vineyard site, season and wine style all make a difference. There is no single national harvest period that applies to every vineyard.

How do growers know when grapes are ready?

Sugar is one useful measurement, but it is not the whole story. Soluble solids—often reported as degrees Brix—help indicate sugar concentration and potential alcohol. Growers and winemakers may also assess acidity and pH, along with the flavour of the berries and the condition of their skins and seeds.

Tannin maturity can matter particularly for red-wine grapes, while disease, bird damage, rain and hot weather can change the decision. The intended wine matters too: the best moment to pick for one style may not be the best moment for another.

That is why “higher sugar means better grapes” is too simple. A balanced harvest decision brings several observations together. Even then, the decision may need to change quickly if rain, heat, disease or other risks threaten the crop.

The basic harvest sequence

Harvest usually follows a practical chain:

1. Assess grape maturity and condition.
2. Decide when to pick a vineyard block, variety or section.
3. Remove the grapes by hand or machine.
4. Collect them in bins, buckets, trailers or harvester compartments.
5. Transport the fruit to the winery.
6. Sort out unsuitable grapes and material other than grapes where required.
7. Pass the fruit into the next winery operation.

The important point for a wine learner is that picking is not an isolated moment. Time, temperature, handling and transport can influence the condition in which grapes arrive at the winery.

Hand harvesting

With hand harvesting, workers cut bunches—usually with secateurs or knives—and place them into containers for collection.

One advantage is selectivity. Workers may be able to leave behind damaged or unsuitable bunches, or work in parts of a vineyard that are steep, irregular or difficult for a machine to access. Hand harvesting may also reduce berry splitting and juice release in particular situations.

However, hand harvesting is slower and requires more labour. It depends on having enough workers and a suitable weather window, and hand-picked fruit can still need sorting. It does not automatically prevent oxidation, damage or contamination.

Hand-picked does not necessarily mean better. It is one method with particular strengths and limitations.

Machine harvesting

A mechanical harvester travels along a vine row and uses shaking or striking mechanisms to detach fruit. It then collects the grapes as the machine moves.

Machine harvesting can remove large quantities of fruit quickly, which may be useful when weather or disease creates pressure to act. It can also reduce reliance on hand labour. Some systems include equipment that helps remove unwanted material or sort fruit.

The method is not suitable for every vineyard. Vine training, trellising, variety, canopy, fruit condition, terrain and machinery access all matter. A machine-harvested load may contain individual berries, bunch pieces, juice, leaves, stems and other material known as MOG—“material other than grapes”. This may increase the need for sorting or other fruit-intake decisions.

Machine harvesting is not automatically harsh or low quality, just as hand harvesting is not automatically gentle or superior. The result depends on the vineyard, fruit, equipment, settings and handling after picking.

Why harvest at night?

Some vineyards harvest at night or before sunrise to work with cooler air and fruit temperatures. Cooler grapes may be easier to manage and, in some circumstances, can help limit juice exposure to oxidation or help retain freshness.

Night harvesting is not universal. It depends on machinery, lighting, worker safety, labour, transport and the winery’s ability to receive fruit outside normal daytime hours. Cooler conditions can help, but they do not remove the need for prompt, careful handling.

What else can change the harvest decision?

Harvest may be brought forward, delayed or divided into several passes because of:

• rain or forecast storms;
• extreme heat;
• disease or rot;
• smoke exposure;
• bird or animal pressure;
• uneven ripening;
• labour or machinery availability;
• transport capacity; or
• the winery’s ability to receive and process grapes.

These pressures help explain why harvest dates vary between Australian regions, vineyards and years. A warmer site may be ready before a higher or cooler site, and different varieties in the same vineyard may be picked at different times.

How does harvesting affect the wine?

Harvest timing and method affect the condition of grapes reaching the winery, including the risk of berry splitting, juice release, oxygen exposure and spoilage. They can also affect the amount of sorting required, transport and receiving logistics, and the downstream choices available to the winemaking team.

But harvesting is only one part of a longer process. It does not, by itself, determine the final wine’s quality or style. Vineyard conditions, sorting, crushing, pressing, fermentation, maturation and blending also contribute.

Frequently asked questions

Are all Australian grapes harvested at the same time?

No. Australian harvest timing varies with climate, region, elevation, variety, vineyard site, season and intended wine style.

Is hand harvesting better than machine harvesting?

Not automatically. Hand harvesting may be selective and suit difficult sites, while machine harvesting may offer speed and efficiency. The appropriate choice depends on the circumstances.

Does more sugar mean riper grapes?

Not necessarily. Sugar is one maturity indicator. Acidity, pH, flavour, tannin and grape condition also matter.

Why are some grapes picked at night?

Night harvesting can provide cooler fruit and air temperatures, which may help with handling and oxidation management in some situations. It is dependent on local equipment, safety and winery logistics.

What is MOG?

MOG means “material other than grapes”. It can include leaves, stems and other unwanted material collected during harvesting, particularly when a machine is used.