Lake Ontario moderates temperature and the Niagara Escarpment turns the air back down over the vineyards, which together buy the growing season its extra weeks.
1988 the alliance−8°C the harvest rule43°N the latitude
01
Two things that only make sense in a cold place
One is a legal temperature. The other is what happens when the temperature is not met.
Naturally frozen fruit on the cane. The rule that governs this picture is a temperature, not a date.
Vinifera vines die at temperatures Ontario reaches, so site selection is a bet about the coldest night in ten years rather than the average.
−8°Cthe threshold
Degrees Celsius, and the entire icewine harvest waits on it
Ontario icewine must be made from grapes frozen naturally on the vine and pressed while still frozen at −8°C or colder — a rule set out in Ontario Regulation 406/00 under the Vintners Quality Alliance Act, 1999. It is a temperature and not a date, which is why the crew is on call from December and the picking usually happens before dawn. Read the piece.
A place with a piece on this site
Ontario
The lakes that make the climate
Where this happens
Three regions, one lake system, and a limestone island
The Niagara Peninsula, Lake Erie North Shore and Prince Edward County do nearly all of it. Pelee Island sits inside the second. Every pin here is a piece on this site.