Bare vine rows in low winter sun running down to open water

The escarpment and the lake do the work

A lake and a cliff make a climate that should not be there

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

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.

Frost-covered cluster of dark grapes on a bare vine in hard winter light

Naturally frozen fruit on the cane. The rule that governs this picture is a temperature, not a date.

Harvested frozen, by rule, at minus eight

Icewine must be picked and pressed while the fruit is naturally frozen at or below −8°C, which is a legal definition and a logistical problem.

A single dead vine trunk, bark split open, standing among healthy ones, close, flat grey light

Split bark on a dead trunk. One night decided this, and the block around it lost years of wood.

A cold night can end a vineyard's decade

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.

Frozen fruit on a bare cane, macro
ONTARIO UNITED STATES LAKE ONTARIO LAKE ERIE Beamsville Bench Niagara-on-the-Lake St Catharines Prince Edward County Pelee Island 100 km N Niagara Peninsula
  • 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.

Four more, from four different corners of the subject

The grape, the labour, the law and the laboratory. Everything else is in the archive.

In November a tractor buries the vines. In April it digs them out.

That is one line item in a County vineyard's budget, and it is the largest. Hilling up.

Who keeps this going

Wineries, research stations, and trade bodies advancing cold-climate viticulture in Ontario.

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