What is made here
Wine colours
Colours the rules allow. Pick a colour to filter the rules and grapes below.
Where it is
Coteaux du Layon in France
- Latitude
- 47.1°–47.4° N
- Vineyard altitude
- 50 m to 103 m
- Delimited vineyard land
- 6,214 ha
Lies within
Anjou Villages, Anjou, Cabernet d'Anjou, Rosé d'Anjou, Rosé de Loire, Crémant de Loire
Contains 2 appellations (outlined on the zone map)
Bonnezeaux, Quarts de Chaume
Worked out from the boundaries (smallest container first). Uses the delimited parcels where INAO publishes them.
The delimited vineyard parcels themselves, so the shape is patchy: only land within them may grow the wine. Boundary: INAO parcel delimitation (Licence Ouverte); nearby parcels drawn as one block, with less detail for larger appellations. Country outlines: Natural Earth. Dots on the zone map are the vineyard points used for climate.
Showing every colour The colour filter changes the rules and grapes. Climate, vintages and soils describe the vineyards, so they stay the same.
01 · What the law says
The rules
Limits on grapes, yields, ripeness and ageing that every wine labelled Coteaux du Layon must meet.
In the vineyard and cellar: rules for every wine
3,300
Vines per hectare, minimum
Training
Systems allowed
taille courte; taille longue; taille mixte
Prohibited
Irrigation
Allowed
Enrichment (chaptalisation)
02 · Climate fingerprint
The climate
The growing season averages 16.0 °C, intermediate on Gregory Jones's scale, with 1,298 growing degree days (Winkler Ib).
The average year 1991–2020, vineyards at about 81 m
Monthly mean, °CRain, mmGrowing season
- Growing-season temperature
- 16.0 °C
- Intermediate · 15–17 °C (Jones)
- Growing degree days
- 1,298
- Region Ib: 1,111–1,388 degree days
- Growing-season rain
- 397 mm
- Of 715 mm a year
- Harvest rain
- 124 mm
- September–October
Copernicus ERA5-Land monthly averages at 5 vineyard points (Vineyard point 1, 64 m; Vineyard point 2, 80 m; Vineyard point 3, 98 m; Vineyard point 4, 70 m; Vineyard point 5, 92 m), moved to each point's height from the model's terrain. Indices that need daily data are not captured yet. How the climate figures are made.
Closest climates in the database
Picked by the data, not by hand: the profiles nearest on season warmth (counted twice), degree days, rain, ripening-month nights and day–night range. Neighbours within 30 km are left out, as they share the same weather.
1. Gros Plant du Pays nantaisVery similarCompared with Coteaux du Layon: same season warmth, similar rain.
2. MuscadetVery similarCompared with Coteaux du Layon: same season warmth, similar rain.
3. Muscadet Sèvre et MaineVery similarCompared with Coteaux du Layon: same season warmth, similar rain.
Growing-season temperature
Growing degree days
Growing-season rain
03 · Year by year
35 vintages
Each column is one growing season: heat above or below the 1991–2020 average, and rain at harvest. Pick a year for the details.
Warmer than averageCooler than averageHarvest rain (Sep–Oct)Average harvest rain, 124 mm
2025
- Growing-season temp.
- Growing degree days
- Harvest rain
- Growing-season rain
- September nights
- Hot days and frosts
Seasons are labelled by harvest year (April–October). Year-to-year changes from ERA5-Land; tested against station records in Alto Adige (r = 0.94 for season temperature at Bolzano). Rain varies more locally, so treat single-season rain with some caution. Vintage ratings, harvest dates and frost or hail events have places in the data model but are not loaded yet.
04 · Where the numbers come from
Sources
- A geospatial inventory of regulatory information for wine protected designations of origin in Europe · Candiago et al., Scientific Data 9, 394 (2022); Eurac Research · CC0
- Quality wines in Italy and France: a dataset of PDO specifications · figshare 25393261 · CC BY 4.0
- ERA5-Land monthly averaged data (reanalysis-era5-land-monthly-means) · Copernicus Climate Change Service (C3S), Climate Data Store · CC BY 4.0 (Copernicus licence)
- OpenStreetMap vineyard areas (landuse=vineyard), from Geofabrik country extracts · OpenStreetMap contributors · ODbL 1.0
- Copernicus DEM GLO-90 (AWS open data tiles) · European Space Agency / Copernicus · Copernicus DEM licence
- Cahier des charges: Coteaux du Layon (Cahier des charges de l'appellation d'origine contrôlée Coteaux du Layon AGRT2527081A - BO n°52 du 25 décembre 2025) · Ministère de l'Agriculture (Bulletin officiel), as linked by INAO · Official act
- Délimitation parcellaire des AOC viticoles de l'INAO · Institut national de l'origine et de la qualité (INAO), via data.gouv.fr · Licence Ouverte / Open Licence (Etalab)
- Appellation nesting worked out from boundaries (pipeline/build_nesting.py) · Vinous, from the Eurac PDO boundaries · CC0 (source data)
- Climate profiles calculated by Vinous: method
Still to check (3)
- Generated from EU reference data: check against the current product specification.
- From the specification: Sweet chenin from overripe grapes picked by hand in successive passes. General density is 4,000 vines/ha (3,300 allowed with extra trellising rules); Premier Cru Chaume needs 4,500, and enrichment is banned for it. Elsewhere total alcohol after enrichment may reach 15% (sugaring) or 18% (partial concentration). Wines below 18% natural alcohol need at least 11% actual alcohol. The 'sélection de grains nobles' mention is added as a product; its yields depend on the name it accompanies.
- National tier (DOC/DOCG) not captured yet; rules extracted from the specification text.