Do I Need to Adjust Canning Time for My Altitude?

Short answer: yes, if you live above about 305 metres — and most of Canada’s Prairie and mountain communities do. The good news is that adjusting is simple once you know the routine. You don’t need to memorise anything or trust a number off a US website. You need three steps: find your elevation, match it to a band, then read the exact adjustment beside your recipe in Bernardin.

This page walks you through those steps and shows where the most-searched Canadian cities fall. What it deliberately does not do is print processing times — because the right number depends on the specific recipe and jar size, and the only safe source for it is the recipe you’re actually making.

Why altitude matters at all

Water boils at 100 °C at sea level. The higher you go, the lower the air pressure, and the lower the temperature at which water boils. At Calgary’s elevation it boils a few degrees below 100 °C; higher still in the Rockies.

That small drop matters because canning relies on heat to destroy the bacteria, yeasts, and moulds that spoil food — and, in low-acid foods, the spores that cause botulism. Cooler boiling water does that job more slowly, so:

• Water-bath canning (high-acid foods — jams, pickles, acidified tomatoes, fruit): you keep the recipe’s instructions and add time.
• Pressure canning (low-acid foods — vegetables, meats, beans, soup): you keep the time and increase the pressure (PSI).

Altitude only ever changes minutes (water-bath) or pressure (pressure canning). It never changes headspace, the tomato acidification rule, or jar size. Those stay exactly as the recipe states.

For the full breakdown of how the bands work, see our altitude adjustments guide.

Step 1 — Find your elevation

You only need to know which band you’re in, not your elevation to the metre. Look up your municipality on Statistics Canada or Natural Resources Canada, or read it off a topographic map.

One caution: if your home sits higher than your town’s official centre — common in the Alberta foothills and the BC Interior — use the higher figure. When in doubt, go up, not down.

Step 2 — Match it to a Canadian altitude band

Bernardin and Health Canada group Canadian elevations into four bands. The base recipe applies in the lowest band; each higher band adds an adjustment:

Band	Elevation (metric)	Elevation (imperial)	Action
1	0 – 305 m	0 – 1,000 ft	Use the recipe’s base time
2	305 – 610 m	1,000 – 2,000 ft	Add the Bernardin Band 2 adjustment
3	610 – 1,220 m	2,000 – 4,000 ft	Add the Bernardin Band 3 adjustment
4	1,220 m +	4,000 ft +	Add the Bernardin Band 4 adjustment

On the line between two bands? Round up. Over-processing slightly costs you a little texture; under-processing risks the safety of the jar.

Step 3 — Read the exact adjustment in Bernardin

This is the step no website can do for you, and that’s by design. Open your edition of the Bernardin Complete Book of Home Preserving to the recipe you’re making. Each recipe lists its base time plus the additions for each band. The increment is not the same from one recipe to the next — a jam and a jar of pickles at the same altitude can call for different additions — so there is no single “number for my city” that works across the board.

We don’t republish those times here. The safe number is always the one printed beside your recipe.

Where Canada’s most-searched cities fall

These are the elevations and bands for the cities people look up most. Use them to find your band quickly — then go to Step 3 for your recipe’s actual adjustment.

City	Elevation	Band
Calgary, AB	1,045 m	3
Edmonton, AB	668 m	3
Banff, AB	1,383 m	4
Canmore, AB	1,309 m	4
Kelowna, BC	344 m	2
Kamloops, BC	~345 m	2
Saskatoon, SK	481 m	2
Regina, SK	577 m	2
Winnipeg, MB	239 m	1
Whitehorse, YT	706 m	3
Vancouver, BC	0 – 70 m	1
Toronto, ON	76 m	1
Ottawa, ON	70 m	1
Montréal, QC	36 m	1
Halifax, NS	145 m	1

Calgary (1,045 m — Band 3)

Calgary is the reason this question gets asked so often: at over a kilometre above sea level it sits firmly in Band 3, yet most recipes Calgarians find online are written for sea level. For water-bath canning, add your recipe’s Band 3 time addition from Bernardin. For pressure canning, step the PSI up to the Band 3 setting and keep the time the same.

Edmonton (668 m — Band 3)

Edmonton clears the 610 m line into Band 3 as well — a point many people miss because it feels lower than Calgary. Treat it the same way: Band 3 time addition for water-bath, Band 3 PSI step for pressure canning.

Kelowna (344 m — Band 2)

Kelowna and much of the Okanagan sit just over the 305 m line, putting them in Band 2 — the smallest adjustment, but still an adjustment. Don’t treat Okanagan elevations as sea level; use the Band 2 figures from your recipe.

Banff and Canmore (1,383 m / 1,309 m — Band 4)

The Bow Valley mountain communities are in Band 4, the highest band, where adjustments are largest. If you can in Banff, Canmore, or anywhere in the mountain parks, always use the Band 4 column — and if your cabin sits above the townsite, you’re still in Band 4, so you’re covered.

What never changes, at any altitude

• Headspace — exactly what the recipe says (commonly 1 cm / ½ inch for jams and pickles, 2 cm / ¾ inch for tomatoes and fruit in syrup).
• Tomato acidification — for water-bath-canned tomatoes, the bottled-lemon-juice or citric-acid amount Bernardin and Health Canada specify. Altitude does not change this.
• Jar size — a recipe written for 500 mL jars can’t simply be moved to 1 L jars; the time has to be re-checked for that jar size.

Adjust the minutes or the pressure for your band, leave everything else alone, and follow a tested Bernardin or Health Canada recipe. That’s the whole routine — and it’s the same whether you’re in Halifax or high in the Rockies.