Harvest
Ripeness assessment
Judging when cider fruit has converted enough starch, loosened enough on the spur and hardened enough for the store to be worth gathering.
Also called Harvest timing, Maturity judgement, Deciding when to pick.
- Stage
- Harvest
- Traditional in
- No single tradition — used wherever it suits
- What it most changes
- Acidity down
- Safety
- None recorded
What it is
A judgement, made tree by tree and block by block, about whether a crop has reached the state the maker wants it in — not a single measurement with a threshold. For cider and perry fruit the question is rarely "is this good to eat now?" but "will this fruit be in the right condition by the time it reaches the mill?". The grower reads several signals together: how far starch has converted to sugar, how readily the stalk parts from the spur, how far the seeds have darkened, ground colour under the russet or flush, and how much fruit the tree has already dropped of its own accord.
Described in full
- Shape
- Four labelled curves on a common horizontal axis running from earlier to later on the tree. There is no numeric scale on either axis. Starch begins near the top and falls to almost nothing. Sugar begins low and rises, flattening towards the end. Acid begins high and falls steadily. Firmness begins high and falls, more steeply late.
- Starch
- Falls to zero as the fruit converts stored starch to sugar. This is what the starch–iodine test reads, and it is the most used field indicator of harvest maturity because the change is large, ordered and visible with a cut fruit and a bottle of iodine.
- Sugar
- Rises as starch converts and as the fruit continues to import sugar from the leaves, then flattens. Sugar sets potential alcohol, so a maker pressing early accepts a weaker cider.
- Acid
- Falls throughout, because malic acid is respired by the fruit itself. Waiting for more sugar therefore costs acid, and in low-acid bittersweet fruit that is a microbiological cost as well as a sensory one.
- Firmness
- Falls as the cell walls break down, slowly at first and faster late. It governs how the fruit mills: firm fruit grates cleanly, soft fruit smears and presses badly.
- Why there is no scale
- The directions here are general across cider fruit. The rates are not — they belong to a cultivar, a season and a site, and an axis with numbers on it would invite a reader to read a picking date off a drawing. What the figure shows is the shape of the trade-off, not its timing.
- The point of the figure
- The four curves do not cross a useful threshold at the same moment. Pressing when the starch has gone means pressing before the sugar has finished rising; waiting for maximum sugar means accepting lower acid and softer fruit. There is no moment at which all four are optimal, so harvest maturity is a choice about which curve the maker is prioritising.
Why it is used
- Picked too early, fruit carries unconverted starch and low fermentable sugar, so the juice ferments to a thinner cider than the block was capable of and may leave a starch haze behind.
- Picked too late, the same fruit is already softening on the tree or on the ground, and the proportion of it carrying rot lesions climbs steeply.
- Different cultivars in one orchard mature weeks apart, so a single harvest date across a mixed block guarantees that some of the crop is wrong.
- A crop destined to be held in store has to be picked in a condition that will survive the holding, which is a different target from a crop going straight to the mill.
How it works
- Apples and pears are climacteric: a rise in ethylene production triggers a burst of respiration during which amylases hydrolyse stored starch to glucose, fructose and sucrose, and cell-wall pectins begin to be modified so the flesh softens.
- As the abscission zone at the base of the stalk develops, the fruit separates from the spur with a light lift and twist rather than a pull — the classic hand test, and the reason the crop begins to fall by itself soon after.
- Seed coats darken from white through tan to brown as the seed matures, which tracks the fruit’s development independently of skin colour and so is useful in cultivars whose skin gives nothing away.
- Soluble solids measured on a refractometer rise as starch converts, but the reading is a total of all dissolved solids, so it does not separate fermentable sugar from anything else in solution.
What it changes
The direction this step pushes the finished drink in, dimension by dimension. A direction, not a measurement: how far it moves depends on the juice, the temperature and how the step is carried out.
| Dimension | Direction | Why |
|---|---|---|
| Alcohol | Either way | The fermentable sugar available at pressing is set by how much of the fruit’s stored starch has been hydrolysed, so the picking date determines the ceiling on the finished strength before anything else in the cellar can act on it. |
| Phenolic character | Either way | Procyanidin content and the proportion of higher-molecular-weight polymers shift through the late season, so fruit taken at different dates from the same tree gives measurably different tannin quality in the glass. |
| Acidity | Lowers | Malic acid is consumed as a respiratory substrate during the climacteric, so later-picked fruit brings less titratable acid to the blend than the same fruit taken earlier. |
The chemistry and the organisms
What is actually being changed, and by what. Each entry says what that compound or organism does in cider generally; this page is one place it does it.
Compounds involved
Starch
The fruit’s carbohydrate store, unfermentable until ripening converts it to sugar, and the reason picking early costs alcohol and risks a haze that will not clear.
Glucose
The sugar yeast takes first and the smallest of the three in apple juice, which is why the last sugar left in a slow ferment is almost never glucose.
Fructose
The dominant sugar of apple juice and the sweetest of the common sugars, which is why apple juice tastes sweeter than its total sugar figure implies and why a stuck ferment leaves sweetness behind.
Sucrose
The disaccharide of apple juice and the sugar most often added to it, split into glucose and fructose by the yeast’s own invertase before any of it is fermented.
Sorbitol
The unfermentable sugar alcohol that pears carry in quantity and apples carry only in trace, and the single reason a fully fermented perry keeps a sweetness a fully fermented cider cannot.
Malic acid
The acid of apples, which supplies almost all the sharpness a cider has and, through pH, decides how vulnerable that cider is to everything that could spoil it.
Procyanidins
The condensed tannins of cider fruit, whose chain length — not their quantity — decides whether the mouth registers bitterness or astringency.
What it is done with
The refractometer, and why it lies during fermentation
A refractometer measures how much a liquid bends light, which tracks dissolved sugar closely in juice and needs only a drop of sample — but ethanol bends light too, so once fermentation starts the reading is no longer a sugar measurement.
The hydrometer and the trial jar
A weighted glass float that sinks to a depth set by the density of the liquid, read against a scale on its stem; with a starting and a finishing reading it gives the sugar consumed and an estimate of alcohol produced.
Drawing a sample without spoiling the batch
Every sample is a small hole made in the protection around a batch: something goes in, air goes in with it, and cider comes out — so the technique is about drawing a representative sample while putting nothing back and letting in as little air as possible.
Laboratory measurement versus practical measurement
Gravity, temperature, pH and total acidity are all within reach of a careful person with modest equipment; alcohol by volume, sulphur dioxide for a declaration, patulin, methanol and microbiological counts are not, and pretending otherwise is how numbers on labels become wrong.
What can go wrong
Faults that begin at this step, or that this step makes more likely. Each one is set out with its causes and whether it can be put right.
Starch haze
A persistent haze caused by starch carried in from under-ripe fruit, which has not yet been converted to sugar and stays suspended in the cider.
Patulin contamination
Contamination of juice or cider with patulin, a mycotoxin produced by Penicillium expansum in rotting apples — a genuine food-safety question rather than a flavour one.
Thin body
A cider with no weight or texture in the mouth, most often from over-watered pomace, low-gravity juice or a blend with nothing to give it substance.
Excessive acidity
Acidity high enough to dominate everything else, leaving a cider that is thin, hard and sour rather than fresh.
Smoke taint
Ashtray, burnt and medicinal character in cider made from fruit exposed to wildfire smoke, which enters the fruit as bound precursors and is released later.
Styles it produces
Categories in which this step is characteristic or required. Some name it in their definition; for others it is simply how they have always been made.
Perry
The fermented drink of pears, a tradition parallel to cider rather than derived from it, in which unfermentable sorbitol leaves a sweetness the maker never chose.
American heritage cider
Cider made from the North American heirloom cultivars that survived the collapse of the country’s cider industry, and presented as an expression of that recovered fruit.
Single-varietal cider
Cider made wholly or overwhelmingly from one apple cultivar, presented so that the fruit’s own character is the subject of the drink.
Tasmanian cider
Cider from Tasmania, whose cool maritime climate and long apple-growing history give fruit with the acid that most Australian districts cannot hold.
Vintage cider
Cider from the fruit of a single named harvest, made and sold as an expression of that season rather than of a house style.
Scottish cider
Cider from Scotland, made in a cool maritime climate from dessert, culinary and cold-tolerant fruit, in a small sector built largely within recent decades.
Recorded figures
Shown with the place, period and method each was taken under, and never averaged: the same step run in another cellar genuinely gives a different number.
Starch pattern index5.5–8.0 SPI
USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA, 2017 · Cornell generic starch–iodine chart, 1–8, read on replicate fruit from each of 158 accessions at a single harvest. · Cornell University / USDA-ARS Plant Genetic Resources Unit
Almost every accession in that harvest scored at or near 8 — full starch conversion. That says the fruit was picked at or past maturity rather than that the cultivars behave alike, and it is a good illustration of why a starch index is a decision aid during the picking window rather than a description of a cultivar.
How far the fruit has converted its starch to sugar, read off a published iodine chart. The single most used field test of harvest maturity, and a chart position rather than a quantity. Measured in starch pattern index.
Fruit firmness45.0–90.0 N
USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA, 2017 · Penetrometer on replicate fruit from each of 158 accessions at a single harvest. · Cornell University / USDA-ARS Plant Genetic Resources Unit
The spread across a large accession population in one season. Firmness governs how fruit mills — firm flesh grates into discrete particles, soft flesh smears — so this range is also the range of how easy the fruit is to press.
How much force the flesh resists, which falls as the fruit ripens and decides whether a mill grates the fruit or smears it. Measured in newtons.
More on ripeness assessment
The refractometer is the instrument most often reached for and the one most often misread on cider fruit. It reports refractive index, calibrated in degrees Brix against a sucrose solution, and every dissolved solid in the juice contributes: sugars, but also acids, soluble pectin fragments, and — importantly in apples and far more so in perry pears — sorbitol, which yeast handles poorly and which therefore inflates the reading without adding meaningfully to the eventual alcohol. Pulling in the other direction, starch is insoluble and contributes nothing to the reading at all, so a fruit still holding a large starch reserve under-reads relative to the sugar it will eventually carry. Two samples at the same Brix can be at quite different points in their development, and a bittersweet read against a dessert-fruit expectation will mislead in both directions at once.
What a practitioner actually decides differs sharply between traditions. In the West Country the late bittersweets are picked, or gathered after falling, in the knowledge that they will be held in a barn or in a heap for a period before milling, so the target is a fruit sound enough to survive that hold rather than one at its eating peak; the West Country cultivar literature describes harvest windows in exactly those terms. Late French amères and douces-amères in the Pays d’Auge are treated the same way, with the store doing part of the work that the tree would otherwise finish. Spanish and Basque practice inverts the question: the fruit is allowed to reach the orchard floor and the decision is when to gather it, so ripeness assessment becomes a judgement about how long the sward can safely be left before the recogida.
Doing it badly is not usually dramatic. An orchard picked a fortnight early yields juice that is lower in gravity and higher in acid than the maker expected, ferments unremarkably, and produces a cider that is simply thinner than the block should have given — and, if the starch was well short of converted, may throw a haze that no fining will properly clear. An orchard picked a fortnight late arrives at the mill with a proportion of fruit already carrying brown lesions, and that proportion, not the average condition of the load, is what determines the food-safety problem the intake bench then has to solve. Because the two failures look nothing alike, growers tend to build a habitual bias in one direction and keep it, which is why the same block picked by two people on the same day can be described as ready and as a week off.
Related processes
Steps that sit alongside this one, replace it, or depend on it having been done.
Harvest
Starch–iodine testing
Staining a cut apple with iodine solution so that remaining starch turns blue-black, giving a visible map of how far conversion to sugar has progressed.
Harvest
Sweating the fruit
Deliberately heaping or storing gathered fruit so that it softens, loses water and finishes converting starch before it goes to the mill.
Harvest
Fruit storage before milling
Holding a gathered crop between harvest and the mill, and managing what respiration, water loss and spoilage do to it while it waits.
Harvest
Shaking and collecting
Bringing fruit down with a pole or letting it fall, then gathering it from the orchard floor — the traditional way most cider and perry fruit has always been harvested.
Harvest
Windfall management
Deciding which fruit that has reached the orchard floor can be used, and getting the rest out of the crop before it becomes a patulin problem.
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- What is malic acid and why does it matter in cider — Malic acid is the acid of apples and supplies almost all the sharpness a cider has. It also sets pH, which decides how well sulphite works and how exposed the cider is to spoilage, so it does far more work than its taste suggests.
- How do i use a hydrometer to measure cider — A hydrometer floats at a depth determined by the density of the liquid it is in. Sugary juice is denser than water, so the hydrometer floats high; as fermentation converts sugar to alcohol the density falls and it sinks.
- What are procyanidins in cider — They are the condensed tannins of apples: chains of catechin-type units whose length decides how much of the phenolic load reads as bitterness and how much as astringency. Two ciders with identical total tannin can taste nothing alike.
- Which sugar is most of the sugar in apple juice — Fructose, by a long way. Apple juice carries roughly twice as much fructose as glucose, with a smaller amount of sucrose, and fructose is the sweetest of the three on the tongue.
- Why is sorbitol important in perry — Sorbitol is a sugar alcohol that pears carry in quantity and that Saccharomyces cannot ferment. It passes through the whole fermentation untouched, so a perry can taste sweet while being dry by measurement.
- Can you use windfall apples for cider — Traditional cider making relies on fruit gathered from the ground, and there is nothing wrong with it if it is sound. Rotten fruit is a different matter: brown rot carries patulin into the juice and should be discarded, not pressed.
Where to go next
- How cider is made — The whole sequence, stage by stage, with the choices open at each one.
- Cider science — The chemistry and microbiology the methods on this page rest on.
- Troubleshooting — What goes wrong, how to recognise it, and whether it can be reversed.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
A Somerset Pomona: The Cider Apples of Somerset
Liz Copas, The Dovecote Press, 2001. ISBN 9781874336877 · reference work · bibliographic record verified, not opened 2026-08-25
Bibliographic record verified on 2026-08-25 against Open Library: Liz Copas, The Dovecote Press, 2001, ISBN 9781874336877. The author was Long Ashton’s cider pomologist, which is why this work is registered for Somerset cultivar identity at all — it is the nearest thing to a successor to the station’s own descriptions. No copy was opened. Not digitised in any open collection.
Institut Français des Productions Cidricoles (IFPC)
IFPC · research institute · retrieved 2026-08-24
The French technical institute for cider production. The authority for the French cultivar classification families, for keeving as an industrial process, and for the pectin and nitrogen chemistry that keeving depends on.
The Science of Cidermaking and associated technical writing
Andrew Lea · reference work · passage verified 2026-08-24
Written by a food chemist who worked at Long Ashton on apple phenolics. Unusual among specialist cider writing in that it is primary-research-adjacent: the author is describing work he did, and cites the literature. This is why it is registered at tier 1 for chemistry while a general cider book is not.
The New Cider Maker’s Handbook: A Comprehensive Guide for Craft Producers
Claude Jolicoeur, Chelsea Green Publishing, 2013. ISBN 9781603584739 · reference work · bibliographic record verified, not opened 2026-08-25
Bibliographic record verified on 2026-08-25 against the Open Library union catalogue: Chelsea Green Publishing, 2013, ISBN 9781603584739, one edition recorded. That establishes the citation points at a real book in a stated edition, which is what a citation needs and is all it establishes. No copy was opened and nothing is quoted from it. The book itself is in print and not digitised in any open collection; where CiderHQ needs a figure from this territory it uses an accessible research source instead and says so.