What is made here
Wine colours
The only colour the rules allow.
Where it is
Casteggio in Italy
- Latitude
- 44.9°–45.0° N
- Vineyard altitude
- 122 m to 287 m
- Production zone
- 9,378 ha
Lies within
Bonarda dell'Oltrepò Pavese, Pinot nero dell'Oltrepò Pavese, Oltrepò Pavese Pinot grigio, Oltrepò Pavese, Oltrepò Pavese metodo classico
Worked out from the boundaries (smallest container first). They follow whole communes, so a neighbour sharing a commune can show up here too.
Boundary drawn from whole communes, so it is a little larger than the legal zone. Boundary: Eurac Research PDO inventory (CC0). Country outlines: Natural Earth. Dots on the zone map are the vineyard points used for climate.
01 · What the law says
The rules
Limits on grapes, yields, ripeness and ageing that every wine labelled Casteggio must meet.
Blend rules
Casteggio e Casteggio Riserva
- ≥ 65% Barbera · Main grape
- ≤ 35% Croatina / Uva Rara / Ughetta (Vespolina) / Pinot Nero · Allowed
At least 24 months' ageing.
Blend rules
Casteggio riserva
- ≥ 65% Barbera · Main grape
- ≤ 35% Croatina / Uva Rara / Ughetta (Vespolina) / Pinot Nero · Allowed
At least 36 months' ageing.
In the vineyard and cellar: rules for every wine
4,000
Vines per hectare, minimum
Training
Systems allowed
controspalliera
Emergency only
Irrigation
Cellar
Where the wine must be made
Within the production zone
02 · Climate fingerprint
The climate
The growing season averages 18.6 °C, warm on Gregory Jones's scale, with 1,849 growing degree days (Winkler III).
The average year 1991–2020, vineyards at about 159 m
Monthly mean, °CRain, mmGrowing season
- Growing-season temperature
- 18.6 °C
- Warm · 17–19 °C (Jones)
- Growing degree days
- 1,849
- Region III: 1,667–1,943 degree days
- Growing-season rain
- 525 mm
- Of 890 mm a year
- Harvest rain
- 182 mm
- September–October
Copernicus ERA5-Land monthly averages at 5 vineyard points (Vineyard point 1, 137 m; Vineyard point 2, 165 m; Vineyard point 3, 85 m; Vineyard point 4, 285 m; Vineyard point 5, 123 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. Rosso OrvietanoVery similarCompared with Casteggio: same season warmth, similar rain.
2. Terre di CasoleVery similarCompared with Casteggio: same season warmth, similar rain.
3. Aleatico di GradoliVery similarCompared with Casteggio: 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, 182 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
- Disciplinare di produzione: Casteggio · Ministero dell'agricoltura, della sovranità alimentare e delle foreste (MASAF) · Official act
- 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: The register lists one name covering both Casteggio and Casteggio riserva; a separate riserva product records its three-year ageing from 1 November. Vineyards of Croatina need only 3,200 vines/ha; grapes must be hand-picked; vinification must take place in the Oltrepò Pavese DOC zone, Pavia province or two hamlets of Ziano Piacentino.
- National tier (DOC/DOCG) not captured yet; rules extracted from the specification text.